Merge pull request #462 from david-cermak/feat/eppp_link

New component ESP-PPP-Link

.github/workflows/console_cmd_ifconfig__build.yml

@@ -0,0 +1,32 @@
+name: "console_cmd_ifconfig: build-tests"
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    types: [opened, synchronize, reopened, labeled]
+
+jobs:
+  build_console_cmd_ifconfig:
+    if: contains(github.event.pull_request.labels.*.name, 'console') || github.event_name == 'push'
+    name: Build
+    strategy:
+      matrix:
+        idf_ver: ["latest", "release-v5.0"]
+        idf_target: ["esp32"]
+        test: [ { app: ifconfig-basic, path: "components/console_cmd_ifconfig/examples"}]
+    runs-on: ubuntu-20.04
+    container: espressif/idf:${{ matrix.idf_ver }}
+    steps:
+      - name: Checkout esp-protocols
+        uses: actions/checkout@v3
+        with:
+          submodules: recursive
+      - name: Build ${{ matrix.test.app }} with IDF-${{ matrix.idf_ver }} for ${{ matrix.idf_target }}
+        shell: bash
+        working-directory: ${{matrix.test.path}}
+        run: |
+          ${IDF_PATH}/install.sh --enable-pytest
+          . ${IDF_PATH}/export.sh
+          python ../../../ci/build_apps.py ./${{ matrix.test.app }} --target ${{ matrix.idf_target }} -vv --preserve-all --pytest-app

.github/workflows/console_cmd_ping__build.yml

@@ -15,7 +15,7 @@ jobs:
       matrix:
         idf_ver: ["latest", "release-v5.0"]
         idf_target: ["esp32"]
-        test: [ { app: example, path: "components/console_cmd_ping/examples" }]
+        test: [ { app: ping-basic, path: "components/console_cmd_ping/examples" }]
     runs-on: ubuntu-20.04
     container: espressif/idf:${{ matrix.idf_ver }}
     steps:
@@ -29,4 +29,4 @@ jobs:
         run: |
           ${IDF_PATH}/install.sh --enable-pytest
           . ${IDF_PATH}/export.sh
-          python $IDF_PATH/tools/ci/ci_build_apps.py . --target ${{ matrix.idf_target }} -vv --preserve-all --pytest-app
+          python ../../../ci/build_apps.py ./${{ matrix.test.app }} --target ${{ matrix.idf_target }} -vv --preserve-all --pytest-app

.github/workflows/console_cmd_wifi__build.yml

@@ -0,0 +1,32 @@
+name: "console_cmd_wifi: build-tests"
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    types: [opened, synchronize, reopened, labeled]
+
+jobs:
+  build_console_cmd_wifi:
+    if: contains(github.event.pull_request.labels.*.name, 'console') || github.event_name == 'push'
+    name: Build
+    strategy:
+      matrix:
+        idf_ver: ["latest", "release-v5.0"]
+        idf_target: ["esp32"]
+        test: [ { app: wifi-basic, path: "components/console_cmd_wifi/examples" }]
+    runs-on: ubuntu-20.04
+    container: espressif/idf:${{ matrix.idf_ver }}
+    steps:
+      - name: Checkout esp-protocols
+        uses: actions/checkout@v3
+        with:
+          submodules: recursive
+      - name: Build ${{ matrix.test.app }} with IDF-${{ matrix.idf_ver }} for ${{ matrix.idf_target }}
+        shell: bash
+        working-directory: ${{matrix.test.path}}
+        run: |
+          ${IDF_PATH}/install.sh --enable-pytest
+          . ${IDF_PATH}/export.sh
+          python ../../../ci/build_apps.py ./${{ matrix.test.app }} --target ${{ matrix.idf_target }} -vv --preserve-all --pytest-app

.github/workflows/console_simple_init__build.yml

@@ -15,7 +15,7 @@ jobs:
       matrix:
         idf_ver: ["latest", "release-v5.0"]
         idf_target: ["esp32"]
-        test: [ { app: example, path: "components/console_simple_init/examples" }]
+        test: [ { app: console_basic, path: "components/console_simple_init/examples" }]
     runs-on: ubuntu-20.04
     container: espressif/idf:${{ matrix.idf_ver }}
     steps:
@@ -29,4 +29,4 @@ jobs:
         run: |
           ${IDF_PATH}/install.sh --enable-pytest
           . ${IDF_PATH}/export.sh
-          python $IDF_PATH/tools/ci/ci_build_apps.py . --target ${{ matrix.idf_target }} -vv --preserve-all --pytest-app
+          python ../../../ci/build_apps.py ./${{ matrix.test.app }} --target ${{ matrix.idf_target }} -vv --preserve-all --pytest-app

.github/workflows/eppp__build.yml

@@ -0,0 +1,28 @@
+name: "eppp_link: build-tests"
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    types: [opened, synchronize, reopened, labeled]
+
+jobs:
+  build_eppp:
+    if: contains(github.event.pull_request.labels.*.name, 'eppp') || github.event_name == 'push'
+    name: Build
+    strategy:
+      matrix:
+        idf_ver: ["latest"]
+        test: [ { app: host, path: "examples/host" }, { app: slave, path: "examples/slave" }, { app: test_app, path: "test/test_app" }]
+    runs-on: ubuntu-20.04
+    container: espressif/idf:${{ matrix.idf_ver }}
+    steps:
+      - name: Checkout esp-protocols
+        uses: actions/checkout@v3
+      - name: Build ${{ matrix.test.app }} with IDF-${{ matrix.idf_ver }}
+        shell: bash
+        run: |
+          ${IDF_PATH}/install.sh --enable-pytest
+          . ${IDF_PATH}/export.sh
+          python ./ci/build_apps.py ./components/eppp_link/${{matrix.test.path}} -vv --preserve-all

.github/workflows/modem__build-host-tests.yml

@@ -8,25 +8,19 @@ on:
     types: [opened, synchronize, reopened, labeled]
 
 jobs:
-  build_esp_modem:
+  build_esp_modem_examples:
     if: contains(github.event.pull_request.labels.*.name, 'modem') || github.event_name == 'push'
-    name: Build
+    name: Build examples
     strategy:
       matrix:
-        idf_ver: ["latest", "release-v4.2", "release-v4.3", "release-v4.4", "release-v5.0"]
+        idf_ver: ["latest", "release-v4.3", "release-v4.4", "release-v5.0"]
         example: ["pppos_client", "modem_console", "modem_tcp_client", "ap_to_pppos", "simple_cmux_client"]
         exclude:
-          - idf_ver: "release-v4.2"
-            example: simple_cmux_client
-          - idf_ver: "release-v4.2"
-            example: modem_tcp_client
           - idf_ver: "release-v4.3"
             example: modem_tcp_client
           - idf_ver: "release-v4.4"
             example: modem_tcp_client
         include:
-          - idf_ver: "release-v4.2"
-            skip_config: usb
           - idf_ver: "release-v4.3"
             skip_config: usb
           - idf_ver: "release-v5.0"
@@ -50,7 +44,33 @@ jobs:
           . ${IDF_PATH}/export.sh
           python -m pip install idf-build-apps
           cd $GITHUB_WORKSPACE/protocols
-          python ./ci/build_apps.py components/esp_modem/examples/${{ matrix.example }} -m components/esp_modem/examples/.build-test-rules.yml
+          python ./ci/build_apps.py components/esp_modem/examples/${{ matrix.example }} -m components/esp_modem/.build-test-rules.yml
+
+  build_esp_modem_tests:
+    if: contains(github.event.pull_request.labels.*.name, 'modem') || github.event_name == 'push'
+    name: Build tests
+    strategy:
+      matrix:
+        idf_ver: ["release-v5.0", "release-v5.1", "latest"]
+        test: ["target", "target_ota", "target_iperf"]
+
+    runs-on: ubuntu-20.04
+    container: espressif/idf:${{ matrix.idf_ver }}
+    steps:
+      - name: Checkout esp-protocols
+        uses: actions/checkout@v3
+        with:
+          path: protocols
+      - name: Build ${{ matrix.test }} with IDF-${{ matrix.idf_ver }}
+        env:
+          EXPECTED_WARNING: ${{ matrix.warning }}
+        shell: bash
+        run: |
+          . ${IDF_PATH}/export.sh
+          python -m pip install idf-build-apps
+          cd $GITHUB_WORKSPACE/protocols
+          python ./ci/build_apps.py components/esp_modem/test/${{ matrix.test }} -m components/esp_modem/.build-test-rules.yml
+
 
   host_test_esp_modem:
     if: contains(github.event.pull_request.labels.*.name, 'modem') || github.event_name == 'push'

.github/workflows/mqtt_cxx__build.yml

@@ -15,7 +15,7 @@ jobs:
       matrix:
         idf_ver: ["latest", "release-v5.0"]
         idf_target: ["esp32"]
-        test: [ { app: example, path: "components/esp_mqtt_cxx/examples" }]
+        test: [ { app: mqtt-basic, path: "components/esp_mqtt_cxx/examples" }]
     runs-on: ubuntu-20.04
     container: espressif/idf:${{ matrix.idf_ver }}
     steps:
@@ -29,4 +29,4 @@ jobs:
         run: |
           ${IDF_PATH}/install.sh --enable-pytest
           . ${IDF_PATH}/export.sh
-          python $IDF_PATH/tools/ci/ci_build_apps.py . --target ${{ matrix.idf_target }} -vv --preserve-all --pytest-app
+          python ../../../ci/build_apps.py ./${{ matrix.test.app }} --target ${{ matrix.idf_target }} -vv --preserve-all --pytest-app

.github/workflows/publish-docs-component.yml

@@ -48,7 +48,7 @@ jobs:
         run: |
             sudo apt-get update
             sudo apt-get -y install doxygen clang python3-pip
-            python -m pip install breathe recommonmark esp-docs==1.4.1
+            python -m pip install -r docs/requirements.txt
             for comp in  `ls components`; do
               if [[ -d $GITHUB_WORKSPACE/docs/${comp} ]]; then
                 cd $GITHUB_WORKSPACE/docs/${comp}
@@ -92,8 +92,11 @@ jobs:
             components/esp_modem;
             components/esp_mqtt_cxx;
             components/esp_websocket_client;
+            components/eppp_link;
             components/mdns;
             components/console_simple_init;
             components/console_cmd_ping;
+            components/console_cmd_ifconfig;
+            components/console_cmd_wifi;
           namespace: "espressif"
           api_token: ${{ secrets.IDF_COMPONENT_API_TOKEN }}

.pre-commit-config.yaml

@@ -61,8 +61,8 @@ repos:
   - repo: local
     hooks:
       - id: commit message scopes
-        name: "commit message must be scoped with: mdns, modem, websocket, asio, mqtt_cxx, console, common"
-        entry: '\A(?!(feat|fix|ci|bump|test|docs)\((mdns|modem|common|console|websocket|asio|mqtt_cxx|examples)\)\:)'
+        name: "commit message must be scoped with: mdns, modem, websocket, asio, mqtt_cxx, console, common, eppp"
+        entry: '\A(?!(feat|fix|ci|bump|test|docs)\((mdns|modem|common|console|websocket|asio|mqtt_cxx|examples|eppp)\)\:)'
         language: pygrep
         args: [--multiline]
         stages: [commit-msg]

CONTRIBUTING.md

@@ -29,9 +29,8 @@ e.g.
 
 
 ## Creating a new component
-
-Steps:
-1. Add a file named .cz.yaml to the root of the component.
+Once the commit containing a new component is ready follow the steps below:
+1. Add a file named .cz.yaml to the root of the component and add it to your commit.
 
 The template for .cz.yaml should look like this:
 ```
@@ -50,6 +49,8 @@ commitizen:
 
 Replace [component], [version] and [scope] with the specific component name, version and scope you are working with. This command will help you bump the version of the component with the provided details.
 
+Note: It is crucial to adhere to the above steps when introducing a new component. Never merge the code for a new component without first implementing a bump commit.
+
 ## Release process
 
 When releasing a new component version we have to:

README.md

@@ -41,3 +41,15 @@ Please refer to instructions in [ESP-IDF](https://github.com/espressif/esp-idf)
 ### console_cmd_ping
 
 * Brief introduction [README](components/console_cmd_ping/README.md)
+
+### console_cmd_ifconfig
+
+* Brief introduction [README](components/console_cmd_ifconfig/README.md)
+
+### console_cmd_wifi
+
+* Brief introduction [README](components/console_cmd_wifi/README.md)
+
+### ESP PPP Link (eppp)
+
+* Brief introduction [README](components/eppp_link/README.md)

ci/build_apps.py

@@ -10,6 +10,8 @@ import sys
 
 from idf_build_apps import build_apps, find_apps, setup_logging
 from idf_build_apps.constants import SUPPORTED_TARGETS
+from packaging import version
+from pkg_resources import get_distribution
 
 if __name__ == '__main__':
     parser = argparse.ArgumentParser(
@@ -17,6 +19,12 @@ if __name__ == '__main__':
         formatter_class=argparse.ArgumentDefaultsHelpFormatter,
     )
     parser.add_argument('paths', nargs='+', help='Paths to the apps to build.')
+    parser.add_argument(
+        '-v',
+        '--verbose',
+        action='count',
+        help='Increase the LOGGER level of the script. Can be specified multiple times.',
+    )
     parser.add_argument(
         '-t',
         '--target',
@@ -28,6 +36,8 @@ if __name__ == '__main__':
     parser.add_argument('-d', '--delete', action='store_true', help='Delete build artifacts')
     parser.add_argument('-c', '--recursive', action='store_true', help='Build recursively')
     parser.add_argument('-l', '--linux', action='store_true', help='Include linux build (dont check warnings)')
+    parser.add_argument('--preserve-all', action='store_true', help='Preserve the binaries for all apps when specified.')
+    parser.add_argument('--pytest-apps', action='store_true', help='Only build apps required by pytest scripts.')
     args = parser.parse_args()
 
     IDF_PATH = os.environ['IDF_PATH']
@@ -41,20 +51,36 @@ if __name__ == '__main__':
         SUPPORTED_TARGETS.append('linux')
         ignore_warning = 'warning: '  # Ignore all common warnings on linux builds
     setup_logging(2)
-    apps = find_apps(
-        args.paths,
-        recursive=args.recursive,
-        target=args.target,
-        build_dir='build_@t_@w',
-        config_rules_str=args.rules,
-        build_log_path='build_log.txt',
-        size_json_path='size.json' if not args.linux else None,
-        check_warnings=True,
-        preserve=not args.delete,
-        manifest_files=args.manifests,
-        default_build_targets=SUPPORTED_TARGETS,
-        manifest_rootpath='.',
-    )
+    if version.parse(get_distribution('idf_build_apps').version) >= version.parse('2.0.0'):
+        apps = find_apps(
+            args.paths,
+            recursive=args.recursive,
+            target=args.target,
+            build_dir='build_@t_@w',
+            config_rules_str=args.rules,
+            build_log_filename='build_log.txt',
+            size_json_filename='size.json' if not args.linux else None,
+            check_warnings=True,
+            preserve=not args.delete,
+            manifest_files=args.manifests,
+            default_build_targets=SUPPORTED_TARGETS,
+            manifest_rootpath='.',
+        )
+    else:
+        apps = find_apps(
+            args.paths,
+            recursive=args.recursive,
+            target=args.target,
+            build_dir='build_@t_@w',
+            config_rules_str=args.rules,
+            build_log_path='build_log.txt',
+            size_json_path='size.json' if not args.linux else None,
+            check_warnings=True,
+            preserve=not args.delete,
+            manifest_files=args.manifests,
+            default_build_targets=SUPPORTED_TARGETS,
+            manifest_rootpath='.',
+        )
 
     for app in apps:
         print(app)

components/console_cmd_ifconfig/.cz.yaml

@@ -0,0 +1,8 @@
+---
+commitizen:
+  bump_message: 'bump(console): $current_version -> $new_version'
+  pre_bump_hooks: python ../../ci/changelog.py console_cmd_ifconfig
+  tag_format: console_cmd_ifconfig-v$version
+  version: 1.0.1
+  version_files:
+  - idf_component.yml

components/console_cmd_ifconfig/CHANGELOG.md

@@ -0,0 +1,13 @@
+# Changelog
+
+## [1.0.1](https://github.com/espressif/esp-protocols/commits/console_cmd_ifconfig-v1.0.1)
+
+### Bug Fixes
+
+- Fixed ifconfig command for PPP interface and IPv4 only ([8548dabb](https://github.com/espressif/esp-protocols/commit/8548dabb))
+
+## [1.0.0](https://github.com/espressif/esp-protocols/commits/console_cmd_ifconfig-v1.0.0)
+
+### Features
+
+- Console for runtime network interface configuration and monitoring ([8bab1420](https://github.com/espressif/esp-protocols/commit/8bab1420))

components/console_cmd_ifconfig/CMakeLists.txt

@@ -0,0 +1,4 @@
+idf_component_register(SRCS "console_ifconfig.c"
+                    INCLUDE_DIRS "."
+                    PRIV_REQUIRES esp_netif console esp_eth
+                    WHOLE_ARCHIVE)

components/console_cmd_ifconfig/LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+
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+      and distribution as defined by Sections 1 through 9 of this document.
+
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+      the copyright owner that is granting the License.
+
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+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
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+      defend, and hold each Contributor harmless for any liability
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+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
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+
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+   See the License for the specific language governing permissions and
+   limitations under the License.

components/console_cmd_ifconfig/README.md

@@ -0,0 +1,113 @@
+# Console command ifconfig
+The component offers a console with a command that enables runtime network interface configuration and monitoring for any example project.
+
+## API
+
+### Steps to enable console in an example code:
+1. Add this component to your project using ```idf.py add-dependency``` command.
+2. In the main file of the example, add the following line:
+    ```c
+    #include "console_ifconfig.h"
+    ```
+3. Ensure esp-netif and NVS flash is initialized and default event loop is created in your app_main():
+    ```c
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    esp_err_t ret = nvs_flash_init();   //Initialize NVS
+    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
+        ESP_ERROR_CHECK(nvs_flash_erase());
+        ret = nvs_flash_init();
+    }
+    ESP_ERROR_CHECK(ret);
+    ```
+4. In your app_main() function, add the following line as the last line:
+    ```c
+    ESP_ERROR_CHECK(console_cmd_init());     // Initialize console
+
+    // Register all plugin command added to your project
+    ESP_ERROR_CHECK(console_cmd_all_register());
+
+    // To register only ifconfig command skip calling console_cmd_all_register()
+    ESP_ERROR_CHECK(console_cmd_ifconfig_register());
+
+    ESP_ERROR_CHECK(console_cmd_start());    // Start console
+    ```
+
+### Adding a plugin command or component:
+To add a plugin command or any component from IDF component manager into your project, simply include an entry within the `idf_component.yml` file.
+
+For more details refer [IDF Component Manager](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/tools/idf-component-manager.html)
+
+
+## Suported command:
+
+### Ifconfig:
+```
+ ifconfig help: Prints the help text for all ifconfig commands
+ ifconfig netif create/destroy <ethernet handle id>/<iface>: Create or destroy a network interface with the specified ethernet handle or interface name
+ ifconfig eth init/deinit/show: Initialize, deinitialize and display a list of available ethernet handle
+ ifconfig: Display a list of all esp_netif interfaces along with their information
+ ifconfig <iface>: Provide the details of the named interface
+ ifconfig <iface> default: Set the specified interface as the default interface
+ ifconfig <iface> ip6: Enable IPv6 on the specified interface
+ ifconfig <iface> up: Enable the specified interface
+ ifconfig <iface> down: Disable the specified interface
+ ifconfig <iface> link <up/down>: Enable or disable the link of the specified interface
+ ifconfig <iface> napt <enable/disable>: Enable or disable NAPT on the specified interface.
+ ifconfig <iface> ip <ipv4 addr>: Set the IPv4 address of the specified interface
+ ifconfig <iface> mask <ipv4 addr>: Set the subnet mask of the specified interface
+ ifconfig <iface> gw <ipv4 addr>: Set the default gateway of the specified interface
+ ifconfig <iface> staticip: Enables static ip
+ ifconfig <iface> dhcp server <enable/disable>: Enable or disable the DHCP server.(Note: DHCP server is not supported yet)
+ ifconfig <iface> dhcp client <enable/disable>: Enable or disable the DHCP client.
+Note: Disabling the DHCP server and client enables the use of static IP configuration.
+```
+
+## Usage:
+
+### Creating an ethernet interface
+```
+esp> ifconfig eth init
+Internal(IP101): pins: 23,18, Id: 0
+esp> ifconfig netif create 0
+```
+
+### Removing an interface and deinitializing ethernet
+```
+esp> ifconfig netif destroy en1
+I (8351266) ethernet_init: Ethernet(IP101[23,18]) Link Down
+I (8351266) ethernet_init: Ethernet(IP101[23,18]) Stopped
+esp> ifconfig eth deinit
+```
+
+### Set default interface
+```
+esp> ifconfig en1 default
+```
+
+### Enable NAPT on an interface
+```
+esp> ifconfig en1 napt enable
+I (8467116) console_ifconfig: Setting napt enable on en1
+```
+
+### Enable DHCP client on an interface
+```
+esp> ifconfig en1 dhcp client enable
+```
+
+### Enable static IP on an interface
+```
+esp> ifconfig en1 dhcp client disable
+```
+
+### Set static IP address
+```
+esp> ifconfig en1 ip 192.168.5.2
+I (111466) console_ifconfig: Setting ip: 192.168.5.2
+esp> ifconfig en1 mask 255.255.255.0
+I (130946) console_ifconfig: Setting mask: 255.255.255.0
+esp> ifconfig en1 gw 192.168.5.1
+I (143576) console_ifconfig: Setting gw: 192.168.5.1
+I (143576) esp_netif_handlers: eth ip: 192.168.5.2, mask: 255.255.255.0, gw: 192.168.5.1
+```

components/console_cmd_ifconfig/console_ifconfig.c

@@ -0,0 +1,682 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <stdio.h>
+#include <string.h>
+#include "sdkconfig.h"
+#include "lwip/inet.h"
+#include "lwip/netdb.h"
+#include "lwip/sockets.h"
+#include "esp_netif.h"
+#include "esp_eth.h"
+#include "esp_console.h"
+#include "esp_event.h"
+#include "argtable3/argtable3.h"
+#include "esp_log.h"
+#include "esp_netif_net_stack.h"
+#if CONFIG_LWIP_IPV6
+#include "lwip/ip6.h"
+#endif
+#include "lwip/opt.h"
+#include "ethernet_init.h"
+#include "console_ifconfig.h"
+#if IP_NAPT
+#include "lwip/lwip_napt.h"
+#endif
+
+
+/**
+ * Static registration of this plugin is achieved by defining the plugin description
+ * structure and placing it into .console_cmd_desc section.
+ * The name of the section and its placement is determined by linker.lf file in 'plugins' component.
+ */
+static const console_cmd_plugin_desc_t __attribute__((section(".console_cmd_desc"), used)) PLUGIN = {
+    .name = "console_cmd_ifconfig",
+    .plugin_regd_fn = &console_cmd_ifconfig_register
+};
+
+
+typedef struct netif_op_t {
+    char *name;
+    esp_err_t (*operation)(struct netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif);
+    int arg_cnt;
+    int start_index;
+    char *help;
+    int netif_flag;
+} netif_op_t;
+
+
+static esp_err_t ifcfg_help_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif);
+static esp_err_t ifcfg_print_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif);
+static esp_err_t ifcfg_lwip_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif);
+static esp_err_t ifcfg_basic_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif);
+static esp_err_t ifcfg_ip_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif);
+static esp_err_t ifcfg_napt_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif);
+static esp_err_t ifcfg_addr_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif);
+static esp_err_t ifcfg_netif_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif);
+static esp_err_t ifcfg_eth_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif);
+
+static const char *TAG = "console_ifconfig";
+
+netif_op_t cmd_list[] = {
+    {.name = "help",      .operation = ifcfg_help_op,   .arg_cnt = 2, .start_index = 1, .netif_flag = false,  .help = "ifconfig help: Prints the help text for all ifconfig commands"},
+    {.name = "netif",     .operation = ifcfg_netif_op,  .arg_cnt = 4, .start_index = 1, .netif_flag = false,  .help = "ifconfig netif create/destroy <ethernet handle id>/<iface>: Create or destroy a network interface with the specified ethernet handle or interface name"},
+    {.name = "eth",       .operation = ifcfg_eth_op,    .arg_cnt = 3, .start_index = 1, .netif_flag = false,  .help = "ifconfig eth init/deinit/show: Initialize, deinitialize and display a list of available ethernet handle"},
+    {.name = "ifconfig",  .operation = ifcfg_print_op,  .arg_cnt = 1, .start_index = 0, .netif_flag = false,  .help = "ifconfig: Display a list of all esp_netif interfaces along with their information"},
+    {.name = "ifconfig",  .operation = ifcfg_print_op,  .arg_cnt = 2, .start_index = 0, .netif_flag = true,   .help = "ifconfig <iface>: Provide the details of the named interface"},
+    {.name = "default",   .operation = ifcfg_basic_op,  .arg_cnt = 3, .start_index = 2, .netif_flag = true,   .help = "ifconfig <iface> default: Set the specified interface as the default interface"},
+#if CONFIG_LWIP_IPV6
+    {.name = "ip6",       .operation = ifcfg_basic_op,  .arg_cnt = 3, .start_index = 2, .netif_flag = true,   .help = "ifconfig <iface> ip6: Enable IPv6 on the specified interface"},
+#endif
+    {.name = "up",        .operation = ifcfg_lwip_op,   .arg_cnt = 3, .start_index = 2, .netif_flag = true,   .help = "ifconfig <iface> up: Enable the specified interface"},
+    {.name = "down",      .operation = ifcfg_lwip_op,   .arg_cnt = 3, .start_index = 2, .netif_flag = true,   .help = "ifconfig <iface> down: Disable the specified interface"},
+    {.name = "link",      .operation = ifcfg_lwip_op,   .arg_cnt = 4, .start_index = 2, .netif_flag = true,   .help = "ifconfig <iface> link <up/down>: Enable or disable the link of the specified interface"},
+    {.name = "napt",      .operation = ifcfg_napt_op,   .arg_cnt = 4, .start_index = 2, .netif_flag = true,   .help = "ifconfig <iface> napt <enable/disable>: Enable or disable NAPT on the specified interface."},
+    {.name = "ip",        .operation = ifcfg_ip_op,     .arg_cnt = 4, .start_index = 2, .netif_flag = true,   .help = "ifconfig <iface> ip <ipv4 addr>: Set the IPv4 address of the specified interface"},
+    {.name = "mask",      .operation = ifcfg_ip_op,     .arg_cnt = 4, .start_index = 2, .netif_flag = true,   .help = "ifconfig <iface> mask <ipv4 addr>: Set the subnet mask of the specified interface"},
+    {.name = "gw",        .operation = ifcfg_ip_op,     .arg_cnt = 4, .start_index = 2, .netif_flag = true,   .help = "ifconfig <iface> gw <ipv4 addr>: Set the default gateway of the specified interface"},
+    {.name = "staticip",  .operation = ifcfg_addr_op,   .arg_cnt = 3, .start_index = 2, .netif_flag = true,   .help = "ifconfig <iface> staticip: Enables static ip"},
+    {.name = "dhcp",      .operation = ifcfg_addr_op,   .arg_cnt = 5, .start_index = 2, .netif_flag = true,   .help = "ifconfig <iface> dhcp server <enable/disable>: Enable or disable the DHCP server.(Note: DHCP server is not supported yet)\n ifconfig <iface> dhcp client <enable/disable>: Enable or disable the DHCP client.\nNote: Disabling the DHCP server and client enables the use of static IP configuration."},
+};
+
+
+static esp_err_t ifcfg_help_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif)
+{
+    int cmd_count = sizeof(cmd_list) / sizeof(cmd_list[0]);
+
+    for (int i = 0; i < cmd_count; i++) {
+        if ((cmd_list[i].help != NULL) && (strlen(cmd_list[i].help) != 0)) {
+            printf(" %s\n", cmd_list[i].help);
+        }
+    }
+
+    return ESP_OK;
+}
+
+
+static esp_netif_t *get_esp_netif_from_ifname(char *if_name)
+{
+    esp_netif_t *esp_netif = NULL;
+    esp_err_t ret = ESP_FAIL;
+    char interface[10];
+
+    /* Get interface details and obtain the global IPv6 address */
+#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 2, 0)
+    while ((esp_netif = esp_netif_next_unsafe(esp_netif)) != NULL) {
+#else
+    while ((esp_netif = esp_netif_next(esp_netif)) != NULL) {
+#endif
+        ret = esp_netif_get_netif_impl_name(esp_netif, interface);
+
+        if ((ESP_FAIL == ret) || (NULL == esp_netif)) {
+            ESP_LOGE(TAG, "No interface available");
+            return NULL;
+        }
+
+        if (!strcmp(interface, if_name)) {
+            return esp_netif;
+        }
+    }
+
+    return NULL;
+}
+
+
+static esp_err_t ifcfg_basic_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif)
+{
+    /* Set Default */
+    if (!strcmp("default", argv[self->start_index])) {
+        esp_netif_set_default_netif(esp_netif);
+        return ESP_OK;
+    }
+
+#if CONFIG_LWIP_IPV6
+    /* Enable IPv6 on this interface */
+    if (!strcmp("ip6", argv[self->start_index])) {
+        ESP_ERROR_CHECK(esp_netif_create_ip6_linklocal(esp_netif));
+        return ESP_OK;
+    }
+#endif
+    return ESP_FAIL;
+}
+
+
+static esp_err_t ifcfg_lwip_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif)
+{
+    struct netif *lwip_netif = esp_netif_get_netif_impl(esp_netif);
+    if (NULL == lwip_netif) {
+        ESP_LOGE(TAG, "lwip interface %s not available", argv[1]);
+        return ESP_OK;
+    }
+
+    /* Enable/Disable Interface */
+    if (!strcmp("up", argv[self->start_index])) {
+        netif_set_up(lwip_netif);
+        return ESP_OK;
+    }
+
+    if (!strcmp("down", argv[self->start_index])) {
+        netif_set_down(lwip_netif);
+        return ESP_OK;
+    }
+
+    /* Enable/Disable link */
+    if (!strcmp("link", argv[self->start_index])) {
+
+        if (!strcmp("up", argv[self->start_index + 1])) {
+            netif_set_link_up(lwip_netif);
+        }
+
+        if (!strcmp("down", argv[self->start_index + 1])) {
+            netif_set_down(lwip_netif);
+            netif_set_link_down(lwip_netif);
+        }
+
+        return ESP_OK;
+    }
+
+    return ESP_FAIL;
+}
+
+
+static esp_err_t ifcfg_ip_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif)
+{
+    esp_netif_ip_info_t ip_info = {0};
+
+    esp_netif_dhcpc_stop(esp_netif);
+    esp_netif_get_ip_info(esp_netif, &ip_info);
+
+    if (!strcmp("ip", argv[self->start_index])) {
+        ESP_LOGI(TAG, "Setting ip: %s", argv[self->start_index + 1]);
+
+        inet_aton(argv[self->start_index + 1], &ip_info.ip.addr);
+        esp_netif_set_ip_info(esp_netif, &ip_info);
+        return ESP_OK;
+    } else if (!strcmp("mask", argv[self->start_index])) {
+        ESP_LOGI(TAG, "Setting mask: %s", argv[self->start_index + 1]);
+
+        inet_aton(argv[self->start_index + 1], &ip_info.netmask.addr);
+        esp_netif_set_ip_info(esp_netif, &ip_info);
+        return ESP_OK;
+    } else if (!strcmp("gw", argv[self->start_index])) {
+        ESP_LOGI(TAG, "Setting gw: %s", argv[self->start_index + 1]);
+
+        inet_aton(argv[self->start_index + 1], &ip_info.gw.addr);
+        esp_netif_set_ip_info(esp_netif, &ip_info);
+        return ESP_OK;
+    }
+
+    return ESP_FAIL;
+}
+
+
+#if IP_NAPT
+static esp_err_t set_napt(char *if_name, bool state)
+{
+    esp_netif_t *esp_netif = NULL;
+    esp_err_t ret = ESP_FAIL;
+    char interface[10];
+
+    /* Get interface details and own global ipv6 address */
+    for (int i = 0; i < esp_netif_get_nr_of_ifs(); ++i) {
+#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 2, 0)
+        esp_netif = esp_netif_next_unsafe(esp_netif);
+#else
+        esp_netif = esp_netif_next(esp_netif);
+#endif
+        ret = esp_netif_get_netif_impl_name(esp_netif, interface);
+        if ((ESP_FAIL == ret) || (NULL == esp_netif)) {
+            ESP_LOGE(TAG, "No interface available");
+            return ESP_FAIL;
+        }
+
+        if (!strcmp(interface, if_name)) {
+            return esp_netif_napt_enable(esp_netif);
+        }
+    }
+
+    return ESP_FAIL;
+}
+#endif
+
+
+static esp_err_t ifcfg_napt_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif)
+{
+#if IP_NAPT
+    if (!strcmp("napt", argv[self->start_index])) {
+
+        ESP_LOGI(TAG, "Setting napt %s on %s", argv[self->start_index + 1], argv[1]);
+        if (!strcmp(argv[self->start_index + 1], "enable")) {
+            return set_napt(argv[1], true);
+        } else if (!strcmp(argv[self->start_index + 1], "disable")) {
+            return set_napt(argv[1], false);
+        } else {
+            ESP_LOGI(TAG, "Invalid argument: %s", argv[self->start_index + 1]);
+        }
+
+        return ESP_FAIL;
+    }
+#endif
+    ESP_LOGE(TAG, "NAPT not enabled in menuconfig");
+    return ESP_OK;
+}
+
+
+static esp_err_t ifcfg_addr_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif)
+{
+    if (!strcmp("staticip", argv[self->start_index])) {
+        esp_netif_dhcpc_stop(esp_netif);
+        //esp_netif_dhcps_stop(esp_netif);
+        return ESP_OK;
+    } else if (!strcmp("server", argv[self->start_index + 1])) { // Server
+        if (!strcmp("enable", argv[self->start_index + 2])) {
+            ESP_LOGW(TAG, "DHCP Server configuration is not supported yet.");    // TBD
+            //esp_netif_dhcps_start(esp_netif);
+            return ESP_OK;
+        } else if (!strcmp("disable", argv[self->start_index + 2])) {
+            ESP_LOGW(TAG, "DHCP Server configuration is not supported yet.");    // TBD
+            //esp_netif_dhcps_stop(esp_netif);
+            return ESP_OK;
+        }
+
+        ESP_LOGE(TAG, "Invalid argument");
+        return ESP_FAIL;
+
+    } else if (!strcmp("client", argv[self->start_index + 1])) { // Client
+        if (!strcmp("enable", argv[self->start_index + 2])) {
+            esp_netif_dhcpc_start(esp_netif);
+            return ESP_OK;
+        } else if (!strcmp("disable", argv[self->start_index + 2])) {
+            esp_netif_dhcpc_stop(esp_netif);
+            return ESP_OK;
+        }
+
+        ESP_LOGE(TAG, "Invalid argument");
+        return ESP_FAIL;
+    }
+
+    return ESP_FAIL;
+}
+
+
+static void print_iface_details(esp_netif_t *esp_netif)
+{
+    esp_netif_ip_info_t ip_info;
+    uint8_t mac[NETIF_MAX_HWADDR_LEN];
+    char interface[10];
+#if CONFIG_LWIP_IPV6
+    int ip6_addrs_count = 0;
+    esp_ip6_addr_t ip6[LWIP_IPV6_NUM_ADDRESSES];
+#endif
+    esp_err_t ret = ESP_FAIL;
+    esp_netif_dhcp_status_t status;
+
+    struct netif *lwip_netif = esp_netif_get_netif_impl(esp_netif);
+
+    /* Print Interface Name and Number */
+    ret = esp_netif_get_netif_impl_name(esp_netif, interface);
+    if ((ESP_FAIL == ret) || (NULL == esp_netif)) {
+        ESP_LOGE(TAG, "No interface available");
+        return;
+    }
+
+#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 1, 0)
+    if (esp_netif_get_default_netif() == esp_netif) {
+        ESP_LOGI(TAG, "Interface Name: %s (DEF)", interface);
+    } else {
+        ESP_LOGI(TAG, "Interface Name: %s", interface);
+    }
+#else
+    ESP_LOGI(TAG, "Interface Name: %s", interface);
+#endif
+    if (lwip_netif != NULL) {
+        ESP_LOGI(TAG, "Interface Number: %d", lwip_netif->num);
+    }
+
+    /* Print MAC address */
+    esp_netif_get_mac(esp_netif, mac);
+    ESP_LOGI(TAG, "MAC: %02x:%02x:%02x:%02x:%02x:%02x", mac[0], mac[1],
+             mac[2], mac[3], mac[4], mac[5]);
+
+    /* Print DHCP status */
+    if (ESP_OK == esp_netif_dhcps_get_status(esp_netif, &status)) {
+        ESP_LOGI(TAG, "DHCP Server Status: %s", (status == ESP_NETIF_DHCP_STARTED) || (status == ESP_NETIF_DHCP_STOPPED) ? "enabled" : "disabled");
+    } else if ((ESP_OK == esp_netif_dhcpc_get_status(esp_netif, &status))) {
+        if (ESP_NETIF_DHCP_STOPPED == status) {
+            ESP_LOGI(TAG, "Static IP");
+        } else {
+            ESP_LOGI(TAG, "DHCP Client Status: %s", status ? "enabled" : "disabled");
+        }
+    }
+
+    /* Print IP Info */
+    esp_netif_get_ip_info(esp_netif, &ip_info);
+    ESP_LOGI(TAG, "IP: " IPSTR ", MASK: " IPSTR ", GW: " IPSTR, IP2STR(&(ip_info.ip)), IP2STR(&(ip_info.netmask)), IP2STR(&(ip_info.gw)));
+
+#if IP_NAPT
+    /* Print NAPT status*/
+    if (lwip_netif != NULL) {
+        ESP_LOGI(TAG, "NAPT: %s", lwip_netif->napt ? "enabled" : "disabled");
+    }
+#endif
+
+#if CONFIG_LWIP_IPV6
+    /* Print IPv6 Address */
+    ip6_addrs_count = esp_netif_get_all_ip6(esp_netif, ip6);
+    for (int j = 0; j < ip6_addrs_count; ++j) {
+        ESP_LOGI(TAG, "IPv6 address: " IPV6STR, IPV62STR(ip6[j]));
+    }
+#endif
+
+    /* Print Interface and Link Status*/
+    ESP_LOGI(TAG, "Interface Status: %s", esp_netif_is_netif_up(esp_netif) ? "UP" : "DOWN");
+    if (lwip_netif != NULL) {
+        ESP_LOGI(TAG, "Link Status: %s", netif_is_link_up(lwip_netif) ? "UP" : "DOWN");
+    }
+    ESP_LOGI(TAG, "");
+}
+
+
+static esp_err_t ifcfg_print_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif)
+{
+    /* Print interface details */
+    if (2 == argc) {
+        print_iface_details(esp_netif);
+        return ESP_OK;
+    }
+
+    /* Get interface details and own global ipv6 address of all interfaces */
+    for (int i = 0; i < esp_netif_get_nr_of_ifs(); ++i) {
+#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 2, 0)
+        esp_netif = esp_netif_next_unsafe(esp_netif);
+#else
+        esp_netif = esp_netif_next(esp_netif);
+#endif
+        print_iface_details(esp_netif);
+    }
+
+    return ESP_OK;
+}
+
+
+/* Maximum number of interface that can be added */
+#define MAX_ETH_NETIF_COUNT     (10)
+
+typedef enum {
+    UNINITIALIZED = 0,
+    ETH_INITIALIZED = 1,
+    NETIF_CREATED = 2,
+    NETIF_DESTROYED = 3,
+    ETH_DEINITIALIZED = 4
+} iface_state;
+
+typedef struct {
+    esp_netif_t *esp_netif;
+    esp_eth_handle_t *eth_handle;
+    esp_eth_netif_glue_handle_t eth_glue;
+    iface_state state;
+} iface_desc;
+
+static iface_desc iface_list[MAX_ETH_NETIF_COUNT];
+static uint8_t netif_count;
+static uint8_t eth_init_flag = false;
+static uint8_t eth_port_cnt_g = 0;
+
+static esp_err_t get_netif_config(uint16_t id, esp_netif_config_t *eth_cfg_o)
+{
+    /* Create new default instance of esp-netif for Ethernet */
+    char *if_key;
+    if (asprintf(&if_key, "IFC_ETH%d", id) == -1) {
+        return ESP_FAIL;
+    }
+
+    esp_netif_inherent_config_t *esp_eth_base_config = malloc(sizeof(esp_netif_inherent_config_t));
+    if (NULL == esp_eth_base_config) {
+        return ESP_FAIL;
+    }
+    *esp_eth_base_config = (esp_netif_inherent_config_t)ESP_NETIF_INHERENT_DEFAULT_ETH();
+
+    esp_eth_base_config->if_key = if_key;
+
+    eth_cfg_o->base = esp_eth_base_config;
+    eth_cfg_o->driver = NULL;
+    eth_cfg_o->stack = ESP_NETIF_NETSTACK_DEFAULT_ETH;
+
+    return ESP_OK;
+}
+
+
+static void free_config(esp_netif_config_t *eth_cfg)
+{
+    if ((NULL != eth_cfg) && (NULL != eth_cfg->base)) {
+        free((void *)(eth_cfg->base->if_key));
+        free((void *)(eth_cfg->base));
+    }
+}
+
+
+static esp_err_t ifcfg_netif_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif)
+{
+    int eth_handle_id = atoi(argv[self->start_index + 2]);
+
+    if (!strcmp(argv[self->start_index + 1], "create")) {
+        /* Validate ethernet handle */
+        if ((eth_handle_id + 1 > eth_port_cnt_g) || (eth_handle_id < 0)) {
+            ESP_LOGE(TAG, "Invalid ethernet handle: %s", argv[self->start_index + 2]);
+            return ESP_FAIL;
+        }
+
+        esp_netif_config_t eth_cfg;
+        ESP_ERROR_CHECK(get_netif_config(eth_handle_id, &eth_cfg));
+        for (int i = 0; i < MAX_ETH_NETIF_COUNT; i++) {
+            if (iface_list[i].state == ETH_INITIALIZED) {
+                esp_netif = esp_netif_new(&eth_cfg);
+                if (esp_netif == NULL) {
+                    ESP_LOGE(TAG, "Interface with key %s already exists", argv[self->start_index + 2]);
+                    return ESP_FAIL;
+                }
+
+                iface_list[i].eth_glue = esp_eth_new_netif_glue(iface_list[i].eth_handle);
+                if (iface_list[i].eth_glue == NULL) {
+                    ESP_LOGE(TAG, "%s: eth_glue is NULL", __func__);
+                    esp_netif_destroy(esp_netif);
+                    return ESP_FAIL;
+                }
+
+                iface_list[i].esp_netif = esp_netif;
+                ESP_ERROR_CHECK(esp_netif_attach(iface_list[i].esp_netif, iface_list[i].eth_glue));
+
+                // start Ethernet driver state machine
+                ESP_ERROR_CHECK(esp_eth_start(iface_list[i].eth_handle));
+
+                free_config(&eth_cfg);
+                iface_list[i].state = NETIF_CREATED;
+                netif_count++;
+                break;
+            }
+        }
+
+        return ESP_OK;
+    } else if (!strcmp(argv[self->start_index + 1], "destroy")) {
+        esp_netif = get_esp_netif_from_ifname(argv[self->start_index + 2]);
+        if (NULL == esp_netif) {
+            ESP_LOGE(TAG, "interface %s not available", argv[1]);
+            return ESP_FAIL;
+        }
+
+        for (int i = 0; i < MAX_ETH_NETIF_COUNT; i++) {
+            if (esp_netif == iface_list[i].esp_netif) {
+                if (iface_list[i].state == NETIF_CREATED) {
+                    esp_eth_stop(iface_list[i].eth_handle);
+                    esp_eth_del_netif_glue(iface_list[i].eth_glue);
+                    esp_netif_destroy(iface_list[i].esp_netif);
+                    iface_list[i].state = NETIF_DESTROYED;
+                    netif_count--;
+                    return ESP_OK;
+                } else {
+                    ESP_LOGE(TAG, "Netif is not in created state");
+                    return ESP_FAIL;
+                }
+                break;
+            }
+        }
+
+        ESP_LOGE(TAG, "Something is very wrong. Unauthorized Interface.");
+        return ESP_FAIL;
+    }
+
+    return ESP_FAIL;
+}
+
+
+static void print_eth_info(eth_dev_info_t eth_info, int id)
+{
+    if (eth_info.type == ETH_DEV_TYPE_INTERNAL_ETH) {
+        printf("Internal(%s): pins: %2d,%2d, Id: %d\n", eth_info.name, eth_info.pin.eth_internal_mdc, eth_info.pin.eth_internal_mdio, id);
+    } else if (eth_info.type == ETH_DEV_TYPE_SPI) {
+        printf("     SPI(%s): pins: %2d,%2d, Id: %d\n", eth_info.name, eth_info.pin.eth_spi_cs, eth_info.pin.eth_spi_int, id);
+    } else {
+        printf("ethernet handle id(ETH_DEV_TYPE_UNKNOWN): %d\n", id);
+    }
+}
+
+
+static esp_err_t ifcfg_eth_op(netif_op_t *self, int argc, char *argv[], esp_netif_t *esp_netif)
+{
+    static esp_eth_handle_t *eth_handle_g = NULL;
+    eth_dev_info_t eth_info;
+
+    if (!strcmp(argv[self->start_index + 1], "init")) {
+
+        /* Check if ethernet is initialized */
+        if (eth_init_flag == false) {
+            // Initialize Ethernet driver
+            if (ethernet_init_all(&eth_handle_g, &eth_port_cnt_g) != ESP_OK) {
+                ESP_LOGE(TAG, "Unable to initialize ethernet");
+                return ESP_FAIL;
+            }
+            eth_init_flag = true;
+
+            for (int i = 0; i < eth_port_cnt_g; i++) {
+                for (int j = 0; j < MAX_ETH_NETIF_COUNT; j++) {
+                    if (iface_list[j].state == UNINITIALIZED) {
+                        iface_list[j].eth_handle = eth_handle_g[i];
+                        iface_list[j].state = ETH_INITIALIZED;
+                        break;
+                    }
+                }
+            }
+
+            if (eth_port_cnt_g > MAX_ETH_NETIF_COUNT) {
+                ESP_LOGW(TAG, "Not all ethernet ports can be assigned a network interface.\nPlease reconfigure MAX_ETH_NETIF_COUNT to a higher value.");
+            }
+
+        } else {
+            ESP_LOGW(TAG, "Ethernet already initialized");
+        }
+
+        /* Display available ethernet handles */
+        for (int i = 0; i < eth_port_cnt_g; i++) {
+            eth_info = ethernet_init_get_dev_info(iface_list[i].eth_handle);
+            print_eth_info(eth_info, i);
+        }
+    } else if (!strcmp(argv[self->start_index + 1], "show")) {
+        /* Check if ethernet is initialized */
+        if (eth_init_flag == false) {
+            // Initialize Ethernet driver
+            ESP_LOGE(TAG, "Ethernet is not initialized.");
+            return ESP_OK;
+        }
+
+        /* Display available ethernet handles */
+        for (int i = 0; i < eth_port_cnt_g; i++) {
+            eth_info = ethernet_init_get_dev_info(iface_list[i].eth_handle);
+            print_eth_info(eth_info, i);
+        }
+    } else if (!strcmp(argv[self->start_index + 1], "deinit")) {
+        /* Check if ethernet is initialized */
+        if (eth_init_flag == false) {
+            // Initialize Ethernet driver
+            ESP_LOGE(TAG, "Ethernet is not initialized.");
+            return ESP_OK;
+        }
+
+        /* Stop and Deinit ethernet here */
+        ethernet_deinit_all(eth_handle_g);
+        eth_port_cnt_g = 0;
+        eth_init_flag = false;
+    } else {
+        return ESP_FAIL;
+    }
+
+    return ESP_OK;
+}
+
+
+/* handle 'ifconfig' command */
+static int do_cmd_ifconfig(int argc, char **argv)
+{
+    esp_netif_t *esp_netif = NULL;
+    int cmd_count = sizeof(cmd_list) / sizeof(cmd_list[0]);
+    netif_op_t cmd;
+
+    for (int i = 0; i < cmd_count; i++) {
+        cmd = cmd_list[i];
+
+        if (argc < cmd.start_index + 1) {
+            continue;
+        }
+
+        if (!strcmp(cmd.name, argv[cmd.start_index])) {
+
+            /* Get interface for eligible commands */
+            if (cmd.netif_flag == true) {
+                esp_netif = get_esp_netif_from_ifname(argv[1]);
+                if (NULL == esp_netif) {
+                    ESP_LOGE(TAG, "interface %s not available", argv[1]);
+                    return 0;
+                }
+            }
+
+            if (cmd.arg_cnt == argc) {
+                if (cmd.operation != NULL) {
+                    if (cmd.operation(&cmd, argc, argv, esp_netif) != ESP_OK) {
+                        ESP_LOGE(TAG, "Usage:\n%s", cmd.help);
+                        return 0;
+                    }
+                }
+                return 0;
+            }
+        }
+    }
+
+    ESP_LOGE(TAG, "Command not available");
+
+    return 1;
+}
+
+
+/**
+ * @brief Registers the ifconfig command.
+ *
+ * @return
+ *          - esp_err_t
+ */
+esp_err_t console_cmd_ifconfig_register(void)
+{
+    esp_err_t ret;
+    esp_console_cmd_t command = {
+        .command = "ifconfig",
+        .help = "Command for network interface configuration and monitoring\nFor more info run 'ifconfig help'",
+        .func = &do_cmd_ifconfig
+    };
+
+    ret = esp_console_cmd_register(&command);
+    if (ret) {
+        ESP_LOGE(TAG, "Unable to register ifconfig");
+    }
+
+    return ret;
+}

components/console_cmd_ifconfig/console_ifconfig.h

@@ -0,0 +1,25 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#include "console_simple_init.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Registers the ifconfig command.
+ *
+ * @return
+ *          - esp_err_t
+ */
+esp_err_t console_cmd_ifconfig_register(void);
+
+#ifdef __cplusplus
+}
+#endif

components/console_cmd_ifconfig/examples/ifconfig-basic/CMakeLists.txt

@@ -0,0 +1,8 @@
+# For more information about build system see
+# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.16)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(ifconfig-basic)

components/console_cmd_ifconfig/examples/ifconfig-basic/main/CMakeLists.txt

@@ -0,0 +1,2 @@
+idf_component_register(SRCS "ifconfig-basic.c"
+                    INCLUDE_DIRS ".")

components/console_cmd_ifconfig/examples/ifconfig-basic/main/idf_component.yml

@@ -0,0 +1,6 @@
+dependencies:
+  idf:
+    version: ">=5.0"
+  console_cmd_ifconfig:
+    version: "*"
+    override_path: '../../../'

components/console_cmd_ifconfig/examples/ifconfig-basic/main/ifconfig-basic.c

@@ -0,0 +1,33 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+#include <stdio.h>
+#include "esp_netif.h"
+#include "nvs_flash.h"
+#include "esp_netif.h"
+#include "esp_event.h"
+#include "console_ifconfig.h"
+
+
+void app_main(void)
+{
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    esp_err_t ret = nvs_flash_init();   //Initialize NVS
+    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
+        ESP_ERROR_CHECK(nvs_flash_erase());
+        ret = nvs_flash_init();
+    }
+    ESP_ERROR_CHECK(ret);
+
+    // Initialize console REPL
+    ESP_ERROR_CHECK(console_cmd_init());
+
+    ESP_ERROR_CHECK(console_cmd_ifconfig_register());
+
+    // start console REPL
+    ESP_ERROR_CHECK(console_cmd_start());
+
+}

components/console_cmd_ifconfig/examples/ifconfig-basic/pytest_ifconfig-basic.py

@@ -0,0 +1,21 @@
+# SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: Unlicense OR CC0-1.0
+
+# -*- coding: utf-8 -*-
+import pytest
+
+
+@pytest.mark.esp32
+def test_examples_ifconfig_command(dut):
+    dut.expect('esp>', timeout=30)
+    dut.write('ifconfig eth init')
+    dut.expect(r'Internal\(IP101\): pins:', timeout=30)
+    dut.write('ifconfig netif create 0')
+    dut.expect(r'ethernet_init: Ethernet\(IP101\[23,18\]\) Link Up', timeout=30)
+    dut.write('ifconfig')
+    dut.expect('console_ifconfig: Interface Name: en1', timeout=5)
+    dut.write('ifconfig netif destroy en1')
+    dut.expect('esp>', timeout=5)
+    dut.write('ifconfig eth deinit')
+    dut.expect('esp>', timeout=5)
+    pass

components/console_cmd_ifconfig/idf_component.yml

@@ -0,0 +1,12 @@
+version: 1.0.1
+url: https://github.com/espressif/esp-protocols/tree/master/components/console_cmd_ifconfig
+description: The component offers a console that enables runtime network interface configuration and monitoring.
+dependencies:
+  idf:
+    version: '>=5.0'
+  espressif/console_simple_init:
+    version: '>=1.1.0'
+    override_path: '../console_simple_init'
+    public: true
+  espressif/ethernet_init:
+    version: '>=0.0.7'

components/console_cmd_wifi/.cz.yaml

@@ -0,0 +1,8 @@
+---
+commitizen:
+  bump_message: 'bump(console): $current_version -> $new_version'
+  pre_bump_hooks: python ../../ci/changelog.py console_cmd_wifi
+  tag_format: console_cmd_wifi-v$version
+  version: 1.0.1
+  version_files:
+  - idf_component.yml

components/console_cmd_wifi/CHANGELOG.md

@@ -0,0 +1,17 @@
+# Changelog
+
+## [1.0.1](https://github.com/espressif/esp-protocols/commits/console_cmd_wifi-v1.0.1)
+
+### Features
+
+- Console for runtime wifi configuration ([194d1179](https://github.com/espressif/esp-protocols/commit/194d1179))
+
+### Bug Fixes
+
+- Fixed license file for console_cmd_wifi ([8285e973](https://github.com/espressif/esp-protocols/commit/8285e973))
+
+## [1.0.0](https://github.com/espressif/esp-protocols/commits/console_cmd_wifi-v1.0.0)
+
+### Features
+
+- Console for runtime wifi configuration ([194d1179](https://github.com/espressif/esp-protocols/commit/194d1179))

components/console_cmd_wifi/CMakeLists.txt

@@ -0,0 +1,4 @@
+idf_component_register(SRCS "console_wifi.c"
+                    INCLUDE_DIRS "."
+                    PRIV_REQUIRES esp_netif console esp_wifi
+                    WHOLE_ARCHIVE)

components/console_cmd_wifi/LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
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+
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+
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+
+      "You" (or "Your") shall mean an individual or Legal Entity
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+
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+
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+
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components/console_cmd_wifi/README.md

@@ -0,0 +1,44 @@
+# Console command wifi
+The component offers a console with a command that enables runtime wifi configuration for any example project.
+
+## API
+
+### Steps to enable console in an example code:
+1. Add this component to your project using ```idf.py add-dependency``` command.
+2. In the main file of the example, add the following line:
+    ```c
+    #include "console_wifi.h"
+    ```
+3. Ensure esp-netif and NVS flash is initialized and default event loop is created in your app_main():
+    ```c
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    esp_err_t ret = nvs_flash_init();   //Initialize NVS
+    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
+        ESP_ERROR_CHECK(nvs_flash_erase());
+        ret = nvs_flash_init();
+    }
+    ESP_ERROR_CHECK(ret);
+    ```
+4. In your app_main() function, add the following line as the last line:
+    ```c
+    ESP_ERROR_CHECK(console_cmd_init());     // Initialize console
+
+    // Register all plugin command added to your project
+    ESP_ERROR_CHECK(console_cmd_all_register());
+
+    // To register only wifi command skip calling console_cmd_all_register()
+    ESP_ERROR_CHECK(console_cmd_wifi_register());
+
+    ESP_ERROR_CHECK(console_cmd_start());    // Start console
+    ```
+
+## Suported command:
+
+### wifi:
+* ```wifi help```: Prints the help text for all wifi commands
+* ```wifi show network```: Scans and displays upto 10 available wifi networks.
+* ```wifi show sta```: Shows the details of wifi station.
+* ```wifi sta join <network ssid> <password>```: Station joins the given wifi network.
+* ```wifi sta join <network ssid>```: Station joins the given unsecured wifi network.
+* ```wifi sta leave```: Station leaves the wifi network.

components/console_cmd_wifi/console_wifi.c

@@ -0,0 +1,276 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <stdio.h>
+#include <string.h>
+#include "sdkconfig.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/event_groups.h"
+#include "esp_netif.h"
+#include "esp_console.h"
+#include "esp_event.h"
+#include "esp_log.h"
+#include "esp_netif_net_stack.h"
+#include "lwip/ip6.h"
+#include "lwip/opt.h"
+#include "esp_wifi.h"
+#include "console_wifi.h"
+
+
+#define DEFAULT_SCAN_LIST_SIZE 10
+
+/**
+ * Static registration of this plugin is achieved by defining the plugin description
+ * structure and placing it into .console_cmd_desc section.
+ * The name of the section and its placement is determined by linker.lf file in 'plugins' component.
+ */
+static const console_cmd_plugin_desc_t __attribute__((section(".console_cmd_desc"), used)) PLUGIN = {
+    .name = "console_cmd_wifi",
+    .plugin_regd_fn = &console_cmd_wifi_register
+};
+
+typedef struct wifi_op_t {
+    char *name;
+    esp_err_t (*operation)(struct wifi_op_t *self, int argc, char *argv[]);
+    int arg_cnt;
+    int start_index;
+    char *help;
+} wifi_op_t;
+
+static esp_err_t wifi_help_op(wifi_op_t *self, int argc, char *argv[]);
+static esp_err_t wifi_show_op(wifi_op_t *self, int argc, char *argv[]);
+static esp_err_t wifi_sta_join_op(wifi_op_t *self, int argc, char *argv[]);
+static esp_err_t wifi_sta_leave_op(wifi_op_t *self, int argc, char *argv[]);
+
+static const char *TAG = "console_wifi";
+
+#define JOIN_TIMEOUT_MS (10000)
+
+static EventGroupHandle_t wifi_event_group;
+static const int STA_STARTED_BIT = BIT0;
+static const int CONNECTED_BIT = BIT1;
+
+static wifi_op_t cmd_list[] = {
+    {.name = "help", .operation = wifi_help_op, .arg_cnt = 2, .start_index = 1, .help = "wifi help: Prints the help text for all wifi commands"},
+    {.name = "show", .operation = wifi_show_op, .arg_cnt = 3, .start_index = 1, .help = "wifi show network/sta: Scans and displays all available wifi APs./ Shows the details of wifi station."},
+    {.name = "join",  .operation = wifi_sta_join_op,  .arg_cnt = 4, .start_index = 2, .help = "wifi sta join <network ssid> <password>: Station joins the given wifi network."},
+    {.name = "join",  .operation = wifi_sta_join_op,  .arg_cnt = 5, .start_index = 2, .help = "wifi sta join <network ssid>: Station joins the given unsecured wifi network."},
+    {.name = "leave", .operation = wifi_sta_leave_op,  .arg_cnt = 3, .start_index = 2, .help = "wifi sta leave: Station leaves the wifi network."},
+};
+
+static void event_handler(void *arg, esp_event_base_t event_base,
+                          int32_t event_id, void *event_data)
+{
+    if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
+        xEventGroupSetBits(wifi_event_group, STA_STARTED_BIT);
+    } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
+        esp_wifi_connect();
+        xEventGroupClearBits(wifi_event_group, CONNECTED_BIT);
+    } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
+        xEventGroupSetBits(wifi_event_group, CONNECTED_BIT);
+    }
+}
+
+static esp_err_t wifi_help_op(wifi_op_t *self, int argc, char *argv[])
+{
+    int cmd_count = sizeof(cmd_list) / sizeof(cmd_list[0]);
+
+    for (int i = 0; i < cmd_count; i++) {
+        if ((cmd_list[i].help != NULL) && (strlen(cmd_list[i].help) != 0)) {
+            printf(" %s\n", cmd_list[i].help);
+        }
+    }
+
+    return ESP_OK;
+}
+
+uint8_t wifi_connection_status = 0;
+
+void wifi_init(void)
+{
+    static bool init_flag = false;
+    if (init_flag) {
+        return;
+    }
+    wifi_event_group = xEventGroupCreate();
+
+    esp_netif_t *sta_netif = esp_netif_create_default_wifi_sta();
+    assert(sta_netif);
+
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
+
+    ESP_ERROR_CHECK(esp_event_handler_register(WIFI_EVENT, WIFI_EVENT_STA_START, &event_handler, NULL));
+    ESP_ERROR_CHECK(esp_event_handler_register(WIFI_EVENT, WIFI_EVENT_STA_DISCONNECTED, &event_handler, NULL));
+    ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler, NULL));
+
+    ESP_ERROR_CHECK(esp_wifi_set_storage(WIFI_STORAGE_RAM));
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
+
+    ESP_ERROR_CHECK(esp_wifi_start());
+
+    int bits = xEventGroupWaitBits(wifi_event_group, STA_STARTED_BIT,
+                                   pdFALSE, pdTRUE, JOIN_TIMEOUT_MS / portTICK_PERIOD_MS);
+
+    if ((bits & STA_STARTED_BIT) == 0) {
+        ESP_LOGE(TAG, "Error: Wifi Connection timed out");
+        return;
+    }
+
+    init_flag = true;
+}
+
+/* Initialize Wi-Fi as sta and set scan method */
+static void wifi_scan(void)
+{
+    uint16_t number = DEFAULT_SCAN_LIST_SIZE;
+    wifi_ap_record_t ap_info[DEFAULT_SCAN_LIST_SIZE];
+    uint16_t ap_count = 0;
+
+    memset(ap_info, 0, sizeof(ap_info));
+
+    wifi_init();
+
+    esp_wifi_scan_start(NULL, true);
+    ESP_ERROR_CHECK(esp_wifi_scan_get_ap_records(&number, ap_info));
+    ESP_ERROR_CHECK(esp_wifi_scan_get_ap_num(&ap_count));
+
+    ESP_LOGI(TAG, "Showing Wifi networks");
+    ESP_LOGI(TAG, "*********************");
+    for (int i = 0; i < number; i++) {
+        ESP_LOGI(TAG, "RSSI: %d\tChannel: %d\tSSID: %s", ap_info[i].rssi, ap_info[i].primary, ap_info[i].ssid);
+    }
+    ESP_LOGI(TAG, "Total APs scanned = %u, actual AP number ap_info holds = %u", ap_count, number);
+}
+
+static esp_err_t wifi_show_op(wifi_op_t *self, int argc, char *argv[])
+{
+    if (!strcmp("network", argv[self->start_index + 1])) {
+        wifi_scan();
+        return ESP_OK;
+    }
+
+    if (!strcmp("sta", argv[self->start_index + 1])) {
+        {
+            wifi_config_t wifi_config = { 0 };
+
+            wifi_init();
+            ESP_ERROR_CHECK(esp_wifi_get_config(WIFI_IF_STA, &wifi_config));
+
+            ESP_LOGI(TAG, "Showing Joind AP details:");
+            ESP_LOGI(TAG, "*************************");
+            ESP_LOGI(TAG, "SSID: %s", wifi_config.sta.ssid);
+            ESP_LOGI(TAG, "Password: %s", wifi_config.sta.password);
+            ESP_LOGI(TAG, "Channel: %d", wifi_config.sta.channel);
+            ESP_LOGI(TAG, "bssid: %02x:%02x:%02x:%02x:%02x:%02x", wifi_config.sta.bssid[0],
+                     wifi_config.sta.bssid[1], wifi_config.sta.bssid[2], wifi_config.sta.bssid[3],
+                     wifi_config.sta.bssid[4], wifi_config.sta.bssid[5]);
+        }
+        return ESP_OK;
+    }
+
+    return ESP_OK;
+}
+
+static esp_err_t wifi_sta_join_op(wifi_op_t *self, int argc, char *argv[])
+{
+    wifi_config_t wifi_config = { 0 };
+
+    if (strcmp("sta", argv[self->start_index - 1])) {
+        ESP_LOGE(TAG, "Error: Invalid command\n");
+        ESP_LOGE(TAG, "%s\n", self->help);
+        return ESP_FAIL;
+    }
+
+    strlcpy((char *) wifi_config.sta.ssid, argv[self->start_index + 1], sizeof(wifi_config.sta.ssid));
+    if (self->arg_cnt == 5) {
+        strlcpy((char *) wifi_config.sta.password, argv[self->start_index + 2], sizeof(wifi_config.sta.password));
+    }
+
+    wifi_init();
+    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
+    esp_wifi_connect();
+
+    int bits = xEventGroupWaitBits(wifi_event_group, CONNECTED_BIT,
+                                   pdFALSE, pdTRUE, JOIN_TIMEOUT_MS / portTICK_PERIOD_MS);
+
+    if ((bits & CONNECTED_BIT) == 0) {
+        ESP_LOGE(TAG, "Error: Wifi Connection timed out");
+        return ESP_OK;
+    }
+
+    return ESP_OK;
+}
+
+static esp_err_t wifi_sta_leave_op(wifi_op_t *self, int argc, char *argv[])
+{
+    wifi_config_t wifi_config = { 0 };
+
+    if (strcmp("sta", argv[self->start_index - 1])) {
+        ESP_LOGE(TAG, "Error: Invalid command\n");
+        ESP_LOGE(TAG, "%s\n", self->help);
+        return ESP_FAIL;
+    }
+
+    esp_wifi_disconnect();
+    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
+
+    return ESP_OK;
+}
+
+/* handle 'wifi' command */
+static esp_err_t do_cmd_wifi(int argc, char **argv)
+{
+    int cmd_count = sizeof(cmd_list) / sizeof(cmd_list[0]);
+    wifi_op_t cmd;
+
+    for (int i = 0; i < cmd_count; i++) {
+        cmd = cmd_list[i];
+
+        if (argc < cmd.start_index + 1) {
+            continue;
+        }
+
+        if (!strcmp(cmd.name, argv[cmd.start_index])) {
+            /* Get interface for eligible commands */
+            if (cmd.arg_cnt == argc) {
+                if (cmd.operation != NULL) {
+                    if (cmd.operation(&cmd, argc, argv) != ESP_OK) {
+                        ESP_LOGE(TAG, "Usage:\n%s", cmd.help);
+                        return 0;
+                    }
+                }
+                return ESP_OK;
+            }
+        }
+    }
+
+    ESP_LOGE(TAG, "Command not available");
+
+    return ESP_OK;
+}
+
+/**
+ * @brief Registers the wifi command.
+ *
+ * @return
+ *          - esp_err_t
+ */
+esp_err_t console_cmd_wifi_register(void)
+{
+    esp_err_t ret;
+    esp_console_cmd_t command = {
+        .command = "wifi",
+        .help = "Command for wifi configuration and monitoring\n For more info run 'wifi help'",
+        .func = &do_cmd_wifi
+    };
+
+    ret = esp_console_cmd_register(&command);
+    if (ret) {
+        ESP_LOGE(TAG, "Unable to register wifi");
+    }
+
+    return ret;
+}

components/console_cmd_wifi/console_wifi.h

@@ -0,0 +1,25 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#include "console_simple_init.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Registers the wifi command.
+ *
+ * @return
+ *          - esp_err_t
+ */
+esp_err_t console_cmd_wifi_register(void);
+
+#ifdef __cplusplus
+}
+#endif

components/console_cmd_wifi/examples/wifi-basic/CMakeLists.txt

@@ -0,0 +1,8 @@
+# For more information about build system see
+# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.16)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(wifi-basic)

components/console_cmd_wifi/examples/wifi-basic/main/CMakeLists.txt

@@ -0,0 +1,2 @@
+idf_component_register(SRCS "wifi-basic.c"
+                    INCLUDE_DIRS ".")

components/console_cmd_wifi/examples/wifi-basic/main/idf_component.yml

@@ -0,0 +1,6 @@
+dependencies:
+  idf:
+    version: ">=5.0"
+  console_cmd_wifi:
+    version: "*"
+    override_path: '../../../'

components/console_cmd_wifi/examples/wifi-basic/main/wifi-basic.c

@@ -0,0 +1,32 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+#include <stdio.h>
+#include "esp_netif.h"
+#include "nvs_flash.h"
+#include "esp_netif.h"
+#include "esp_event.h"
+#include "console_wifi.h"
+
+void app_main(void)
+{
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    esp_err_t ret = nvs_flash_init();   //Initialize NVS
+    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
+        ESP_ERROR_CHECK(nvs_flash_erase());
+        ret = nvs_flash_init();
+    }
+    ESP_ERROR_CHECK(ret);
+
+    // Initialize console REPL
+    ESP_ERROR_CHECK(console_cmd_init());
+
+    ESP_ERROR_CHECK(console_cmd_wifi_register());
+
+    // start console REPL
+    ESP_ERROR_CHECK(console_cmd_start());
+
+}

components/console_cmd_wifi/examples/wifi-basic/pytest_wifi-basic.py

@@ -0,0 +1,14 @@
+# SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: Unlicense OR CC0-1.0
+
+# -*- coding: utf-8 -*-
+
+import pytest
+
+
+@pytest.mark.esp32
+def test_examples_ifconfig_command(dut):
+    dut.expect('esp>', timeout=30)
+    dut.write('wifi show network')
+    dut.expect(r'Showing Wifi networks', timeout=30)
+    dut.expect('esp>', timeout=30)

components/console_cmd_wifi/idf_component.yml

@@ -0,0 +1,10 @@
+version: 1.0.1
+url: https://github.com/espressif/esp-protocols/tree/master/components/console_cmd_wifi
+description: The component offers a console that enables runtime wifi configuration and monitoring.
+dependencies:
+  idf:
+    version: '>=5.0'
+  espressif/console_simple_init:
+    version: '>=1.1.0'
+    override_path: '../console_simple_init'
+    public: true

components/eppp_link/.cz.yaml

@@ -0,0 +1,8 @@
+---
+commitizen:
+  bump_message: 'bump(eppp): $current_version -> $new_version'
+  pre_bump_hooks: python ../../ci/changelog.py eppp_link
+  tag_format: eppp-v$version
+  version: 0.0.1
+  version_files:
+  - idf_component.yml

components/eppp_link/CHANGELOG.md

@@ -0,0 +1,10 @@
+# Changelog
+
+## [0.0.1](https://github.com/espressif/esp-protocols/commits/eppp-v0.0.1)
+
+### Features
+
+- Added CI job to build examples and tests ([8686977](https://github.com/espressif/esp-protocols/commit/8686977))
+- Added support for SPI transport ([18f8452](https://github.com/espressif/esp-protocols/commit/18f8452))
+- Added support for UART transport ([ad27414](https://github.com/espressif/esp-protocols/commit/ad27414))
+- Introduced ESP-PPP-Link component ([a761039](https://github.com/espressif/esp-protocols/commit/a761039))

components/eppp_link/CMakeLists.txt

@@ -0,0 +1,3 @@
+idf_component_register(SRCS "eppp_link.c"
+                    INCLUDE_DIRS "include"
+                    PRIV_REQUIRES esp_netif esp_driver_spi esp_driver_gpio esp_timer driver)

components/eppp_link/Kconfig

@@ -0,0 +1,35 @@
+menu "eppp_link"
+
+    choice EPPP_LINK_DEVICE
+        prompt "Choose PPP device"
+        default EPPP_LINK_DEVICE_UART
+        help
+            Select which peripheral to use for PPP link
+
+        config EPPP_LINK_DEVICE_UART
+            bool "UART"
+            help
+                Use UART.
+
+        config EPPP_LINK_DEVICE_SPI
+            bool "SPI"
+            help
+                Use SPI.
+    endchoice
+
+    config EPPP_LINK_CONN_MAX_RETRY
+        int "Maximum retry"
+        default 6
+        help
+            Set the Maximum retry to infinitely avoid reconnecting
+            This is used only with the simplified API (eppp_connect()
+            and eppp_listen())
+
+    config EPPP_LINK_PACKET_QUEUE_SIZE
+        int "Packet queue size"
+        default 64
+        help
+            Size of the Tx packet queue.
+            You can decrease the number for slower bit rates.
+
+endmenu

components/eppp_link/LICENSE

@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
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components/eppp_link/README.md

@@ -0,0 +1,52 @@
+# ESP PPP Link component (eppp_link)
+
+The component provides a general purpose connectivity engine between two microcontrollers, one acting as PPP server (slave), the other one as PPP client (host).
+This component could be used for extending network using physical serial connection. Applications could vary from providing PRC engine for multiprocessor solutions to serial connection to POSIX machine. This uses a standard PPP protocol to negotiate IP addresses and networking, so standard PPP toolset could be used, e.g. a `pppd` service on linux. Typical application is a WiFi connectivity provider for chips that do not have WiFi
+
+## Typical application
+
+Using this component we can construct a WiFi connectivity gateway on PPP channel. The below diagram depicts an application where
+PPP server is running on a WiFi capable chip with NAPT module translating packets between WiFi and PPPoS interface.
+We usually call this node a SLAVE microcontroller. The "HOST" microcontroller runs PPP client and connects only to the serial line,
+brings in the WiFi connectivity from the "SLAVE" microcontroller.
+
+```
+             SLAVE micro                                  HOST micro
+    \|/  +----------------+                           +----------------+
+     |   |                |          serial line      |                |
+     +---+ WiFi NAT PPPoS |======== UART / SPI =======| PPPoS client   |
+         |        (server)|                           |                |
+         +----------------+                           +----------------+
+```
+
+## API
+
+### Client
+
+* `eppp_connect()` -- Simplified API. Provides the initialization, starts the task and blocks until we're connected
+
+### Server
+
+* `eppp_listen()` -- Simplified API. Provides the initialization, starts the task and blocks until the client connects
+
+### Manual actions
+
+* `eppp_init()` -- Initializes one endpoint (client/server).
+* `eppp_deinit()` -- Destroys the endpoint
+* `eppp_netif_start()` -- Starts the network, could be called after startup or whenever a connection is lost
+* `eppp_netif_stop()` --  Stops the network
+* `eppp_perform()` -- Perform one iteration of the PPP task (need to be called regularly in task-less configuration)
+
+## Throughput
+
+Tested with WiFi-NAPT example, no IRAM optimizations
+
+### UART @ 3Mbauds
+
+* TCP - 2Mbits/s
+* UDP - 2Mbits/s
+
+### SPI @ 20MHz
+
+* TCP - 6Mbits/s
+* UDP - 10Mbits/s

components/eppp_link/eppp_link.c

@@ -0,0 +1,820 @@
+/*
+ * SPDX-FileCopyrightText: 2019-2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <string.h>
+#include <stdint.h>
+#include "sdkconfig.h"
+#include "esp_log.h"
+#include "esp_netif.h"
+#include "esp_check.h"
+#include "esp_event.h"
+#include "esp_netif_ppp.h"
+#include "eppp_link.h"
+
+#if CONFIG_EPPP_LINK_DEVICE_SPI
+#include "driver/spi_master.h"
+#include "driver/spi_slave.h"
+#include "driver/gpio.h"
+#include "esp_timer.h"
+#include "esp_rom_crc.h"
+#elif CONFIG_EPPP_LINK_DEVICE_UART
+#include "driver/uart.h"
+#endif
+
+static const int GOT_IPV4 = BIT0;
+static const int CONNECTION_FAILED = BIT1;
+#define CONNECT_BITS (GOT_IPV4|CONNECTION_FAILED)
+
+static EventGroupHandle_t s_event_group = NULL;
+static const char *TAG = "eppp_link";
+static int s_retry_num = 0;
+static int s_eppp_netif_count = 0; // used as a suffix for the netif key
+
+
+struct packet {
+    size_t len;
+    uint8_t *data;
+};
+
+#if CONFIG_EPPP_LINK_DEVICE_SPI
+#define MAX_PAYLOAD 1500
+#define MIN_TRIGGER_US 20
+#define SPI_HEADER_MAGIC 0x1234
+
+static void timer_callback(void *arg);
+
+struct header {
+    uint16_t magic;
+    uint16_t size;
+    uint16_t next_size;
+    uint16_t check;
+} __attribute__((packed));
+
+enum blocked_status {
+    NONE,
+    MASTER_BLOCKED,
+    MASTER_WANTS_READ,
+    SLAVE_BLOCKED,
+    SLAVE_WANTS_WRITE,
+};
+
+#endif // CONFIG_EPPP_LINK_DEVICE_SPI
+
+struct eppp_handle {
+#if CONFIG_EPPP_LINK_DEVICE_SPI
+    QueueHandle_t out_queue;
+    QueueHandle_t ready_semaphore;
+    spi_device_handle_t spi_device;
+    spi_host_device_t spi_host;
+    int gpio_intr;
+    uint16_t next_size;
+    uint16_t transaction_size;
+    struct packet outbound;
+    enum blocked_status blocked;
+    uint32_t slave_last_edge;
+    esp_timer_handle_t timer;
+#elif CONFIG_EPPP_LINK_DEVICE_UART
+    QueueHandle_t uart_event_queue;
+    uart_port_t uart_port;
+#endif
+    esp_netif_t *netif;
+    eppp_type_t role;
+    bool stop;
+    bool exited;
+    bool netif_stop;
+};
+
+
+static esp_err_t transmit(void *h, void *buffer, size_t len)
+{
+    struct eppp_handle *handle = h;
+#if CONFIG_EPPP_LINK_DEVICE_SPI
+    struct packet buf = { };
+    uint8_t *current_buffer = buffer;
+    size_t remaining = len;
+    do {    // TODO(IDF-9194): Refactor this loop to allocate only once and perform
+        //       fragmentation after receiving from the queue (applicable only if MTU > MAX_PAYLOAD)
+        size_t batch = remaining > MAX_PAYLOAD ? MAX_PAYLOAD : remaining;
+        buf.data = malloc(batch);
+        if (buf.data == NULL) {
+            ESP_LOGE(TAG, "Failed to allocate packet");
+            return ESP_ERR_NO_MEM;
+        }
+        buf.len = batch;
+        remaining -= batch;
+        memcpy(buf.data, current_buffer, batch);
+        current_buffer += batch;
+        BaseType_t ret = xQueueSend(handle->out_queue, &buf, 0);
+        if (ret != pdTRUE) {
+            ESP_LOGE(TAG, "Failed to queue packet to slave!");
+            return ESP_ERR_NO_MEM;
+        }
+    } while (remaining > 0);
+
+    if (handle->role == EPPP_SERVER && handle->blocked == SLAVE_BLOCKED) {
+        uint32_t now = esp_timer_get_time();
+        uint32_t diff = now - handle->slave_last_edge;
+        if (diff < MIN_TRIGGER_US) {
+            esp_rom_delay_us(MIN_TRIGGER_US - diff);
+        }
+        gpio_set_level(handle->gpio_intr, 0);
+    }
+
+#elif CONFIG_EPPP_LINK_DEVICE_UART
+    ESP_LOG_BUFFER_HEXDUMP("ppp_uart_send", buffer, len, ESP_LOG_VERBOSE);
+    uart_write_bytes(handle->uart_port, buffer, len);
+#endif
+    return ESP_OK;
+}
+
+static void netif_deinit(esp_netif_t *netif)
+{
+    if (netif == NULL) {
+        return;
+    }
+    struct eppp_handle *h = esp_netif_get_io_driver(netif);
+    if (h == NULL) {
+        return;
+    }
+#if CONFIG_EPPP_LINK_DEVICE_SPI
+    struct packet buf = { };
+    while (xQueueReceive(h->out_queue, &buf, 0) == pdTRUE) {
+        if (buf.len > 0) {
+            free(buf.data);
+        }
+    }
+    vQueueDelete(h->out_queue);
+    if (h->role == EPPP_CLIENT) {
+        vSemaphoreDelete(h->ready_semaphore);
+    }
+#endif
+    free(h);
+    esp_netif_destroy(netif);
+    if (s_eppp_netif_count > 0) {
+        s_eppp_netif_count--;
+    }
+}
+
+static esp_netif_t *netif_init(eppp_type_t role)
+{
+    if (s_eppp_netif_count > 9) {   // Limit to max 10 netifs, since we use "EPPPx" as the unique key (where x is 0-9)
+        ESP_LOGE(TAG, "Cannot create more than 10 instances");
+        return NULL;
+    }
+
+    // Create the object first
+    struct eppp_handle *h = calloc(1, sizeof(struct eppp_handle));
+    if (!h) {
+        ESP_LOGE(TAG, "Failed to allocate eppp_handle");
+        return NULL;
+    }
+    h->role = role;
+#if CONFIG_EPPP_LINK_DEVICE_SPI
+    h->out_queue = xQueueCreate(CONFIG_EPPP_LINK_PACKET_QUEUE_SIZE, sizeof(struct packet));
+    if (!h->out_queue) {
+        ESP_LOGE(TAG, "Failed to create the packet queue");
+        free(h);
+        return NULL;
+    }
+    if (role == EPPP_CLIENT) {
+        h->ready_semaphore = xSemaphoreCreateBinary();
+        if (!h->ready_semaphore) {
+            ESP_LOGE(TAG, "Failed to create the packet queue");
+            vQueueDelete(h->out_queue);
+            free(h);
+            return NULL;
+        }
+    }
+    h->transaction_size = 0;
+    h->outbound.data = NULL;
+    h->outbound.len = 0;
+    if (role == EPPP_SERVER) {
+        esp_timer_create_args_t args = {
+            .callback = &timer_callback,
+            .arg = h,
+            .name = "timer"
+        };
+        if (esp_timer_create(&args, &h->timer) != ESP_OK) {
+            ESP_LOGE(TAG, "Failed to create the packet queue");
+            vQueueDelete(h->out_queue);
+            vSemaphoreDelete(h->ready_semaphore);
+            free(h);
+            return NULL;
+        }
+    }
+
+#endif
+
+    esp_netif_driver_ifconfig_t driver_cfg = {
+        .handle = h,
+        .transmit = transmit,
+    };
+    const esp_netif_driver_ifconfig_t *ppp_driver_cfg = &driver_cfg;
+
+    esp_netif_inherent_config_t base_netif_cfg = ESP_NETIF_INHERENT_DEFAULT_PPP();
+    char if_key[] = "EPPP0"; // netif key needs to be unique
+    if_key[sizeof(if_key) - 2 /* 2 = two chars before the terminator */ ] += s_eppp_netif_count++;
+    base_netif_cfg.if_key = if_key;
+    if (role == EPPP_CLIENT) {
+        base_netif_cfg.if_desc = "pppos_client";
+    } else {
+        base_netif_cfg.if_desc = "pppos_server";
+    }
+    esp_netif_config_t netif_ppp_config = { .base = &base_netif_cfg,
+                                            .driver = ppp_driver_cfg,
+                                            .stack = ESP_NETIF_NETSTACK_DEFAULT_PPP
+                                          };
+
+    esp_netif_t *netif = esp_netif_new(&netif_ppp_config);
+    if (!netif) {
+        ESP_LOGE(TAG, "Failed to create esp_netif");
+#if CONFIG_EPPP_LINK_DEVICE_SPI
+        vQueueDelete(h->out_queue);
+        if (h->ready_semaphore) {
+            vSemaphoreDelete(h->ready_semaphore);
+        }
+#endif
+        free(h);
+        return NULL;
+    }
+    return netif;
+
+}
+
+esp_err_t eppp_netif_stop(esp_netif_t *netif, int stop_timeout_ms)
+{
+    esp_netif_action_disconnected(netif, 0, 0, 0);
+    esp_netif_action_stop(netif, 0, 0, 0);
+    struct eppp_handle *h = esp_netif_get_io_driver(netif);
+    for (int wait = 0; wait < 100; wait++) {
+        vTaskDelay(pdMS_TO_TICKS(stop_timeout_ms) / 100);
+        if (h->netif_stop) {
+            break;
+        }
+    }
+    if (!h->netif_stop) {
+        return ESP_FAIL;
+    }
+
+    return ESP_OK;
+}
+
+esp_err_t eppp_netif_start(esp_netif_t *netif)
+{
+    esp_netif_action_start(netif, 0, 0, 0);
+    esp_netif_action_connected(netif, 0, 0, 0);
+    return ESP_OK;
+}
+
+static int get_netif_num(esp_netif_t *netif)
+{
+    if (netif == NULL) {
+        return -1;
+    }
+    const char *ifkey = esp_netif_get_ifkey(netif);
+    if (strstr(ifkey, "EPPP") == NULL) {
+        return -1; // not our netif
+    }
+    int netif_cnt = ifkey[4] - '0';
+    if (netif_cnt < 0 || netif_cnt > 9) {
+        ESP_LOGE(TAG, "Unexpected netif key %s", ifkey);
+        return -1;
+    }
+    return  netif_cnt;
+}
+
+static void on_ppp_event(void *arg, esp_event_base_t base, int32_t event_id, void *data)
+{
+    esp_netif_t **netif = data;
+    ESP_LOGD(TAG, "PPP status event: %" PRId32, event_id);
+    if (base == NETIF_PPP_STATUS && event_id == NETIF_PPP_ERRORUSER) {
+        ESP_LOGI(TAG, "Disconnected %d", get_netif_num(*netif));
+        struct eppp_handle *h = esp_netif_get_io_driver(*netif);
+        h->netif_stop = true;
+    }
+}
+
+static void on_ip_event(void *arg, esp_event_base_t base, int32_t event_id, void *data)
+{
+    ip_event_got_ip_t *event = (ip_event_got_ip_t *)data;
+    esp_netif_t *netif = event->esp_netif;
+    int netif_cnt = get_netif_num(netif);
+    if (netif_cnt < 0) {
+        return;
+    }
+    if (event_id == IP_EVENT_PPP_GOT_IP) {
+        ESP_LOGI(TAG, "Got IPv4 event: Interface \"%s(%s)\" address: " IPSTR, esp_netif_get_desc(netif),
+                 esp_netif_get_ifkey(netif), IP2STR(&event->ip_info.ip));
+        xEventGroupSetBits(s_event_group, GOT_IPV4 << (netif_cnt * 2));
+    } else if (event_id == IP_EVENT_PPP_LOST_IP) {
+        ESP_LOGI(TAG, "Disconnected");
+        s_retry_num++;
+        if (s_retry_num > CONFIG_EPPP_LINK_CONN_MAX_RETRY) {
+            ESP_LOGE(TAG, "PPP Connection failed %d times, stop reconnecting.", s_retry_num);
+            xEventGroupSetBits(s_event_group, CONNECTION_FAILED << (netif_cnt * 2));
+        } else {
+            ESP_LOGI(TAG, "PPP Connection failed %d times, try to reconnect.", s_retry_num);
+            eppp_netif_start(netif);
+        }
+    }
+}
+
+#if CONFIG_EPPP_LINK_DEVICE_SPI
+
+#define SPI_ALIGN(size) (((size) + 3U) & ~(3U))
+#define TRANSFER_SIZE SPI_ALIGN((MAX_PAYLOAD + 6))
+#define NEXT_TRANSACTION_SIZE(a,b) (((a)>(b))?(a):(b)) /* next transaction: whichever is bigger */
+
+static void IRAM_ATTR timer_callback(void *arg)
+{
+    struct eppp_handle *h = arg;
+    if (h->blocked == SLAVE_WANTS_WRITE) {
+        gpio_set_level(h->gpio_intr, 0);
+    }
+}
+
+static void IRAM_ATTR gpio_isr_handler(void *arg)
+{
+    static uint32_t s_last_time;
+    uint32_t now = esp_timer_get_time();
+    uint32_t diff = now - s_last_time;
+    if (diff < MIN_TRIGGER_US) { // debounce
+        return;
+    }
+    s_last_time = now;
+    struct eppp_handle *h = arg;
+    BaseType_t yield = false;
+
+    // Positive edge means SPI slave prepared the data
+    if (gpio_get_level(h->gpio_intr) == 1) {
+        xSemaphoreGiveFromISR(h->ready_semaphore, &yield);
+        if (yield) {
+            portYIELD_FROM_ISR();
+        }
+        return;
+    }
+
+    // Negative edge (when master blocked) means that slave wants to transmit
+    if (h->blocked == MASTER_BLOCKED) {
+        struct packet buf = { .data = NULL, .len = -1 };
+        xQueueSendFromISR(h->out_queue, &buf, &yield);
+        if (yield) {
+            portYIELD_FROM_ISR();
+        }
+    }
+}
+
+static esp_err_t deinit_master(esp_netif_t *netif)
+{
+    struct eppp_handle *h = esp_netif_get_io_driver(netif);
+    ESP_RETURN_ON_ERROR(spi_bus_remove_device(h->spi_device), TAG, "Failed to remove SPI bus");
+    ESP_RETURN_ON_ERROR(spi_bus_free(h->spi_host), TAG, "Failed to free SPI bus");
+    return ESP_OK;
+}
+
+static esp_err_t init_master(struct eppp_config_spi_s *config, esp_netif_t *netif)
+{
+    struct eppp_handle *h = esp_netif_get_io_driver(netif);
+    h->spi_host = config->host;
+    h->gpio_intr = config->intr;
+    spi_bus_config_t bus_cfg = {};
+    bus_cfg.mosi_io_num = config->mosi;
+    bus_cfg.miso_io_num = config->miso;
+    bus_cfg.sclk_io_num = config->sclk;
+    bus_cfg.quadwp_io_num = -1;
+    bus_cfg.quadhd_io_num = -1;
+    bus_cfg.max_transfer_sz = TRANSFER_SIZE;
+    bus_cfg.flags = 0;
+    bus_cfg.intr_flags = 0;
+
+    // TODO: Init and deinit SPI bus separately (per Kconfig?)
+    if (spi_bus_initialize(config->host, &bus_cfg, SPI_DMA_CH_AUTO) != ESP_OK) {
+        return ESP_FAIL;
+    }
+
+    spi_device_interface_config_t dev_cfg = {};
+    dev_cfg.clock_speed_hz = config->freq;
+    dev_cfg.mode = 0;
+    dev_cfg.spics_io_num = config->cs;
+    dev_cfg.cs_ena_pretrans = config->cs_ena_pretrans;
+    dev_cfg.cs_ena_posttrans = config->cs_ena_posttrans;
+    dev_cfg.duty_cycle_pos = 128;
+    dev_cfg.input_delay_ns = config->input_delay_ns;
+    dev_cfg.pre_cb = NULL;
+    dev_cfg.post_cb = NULL;
+    dev_cfg.queue_size = 3;
+
+    if (spi_bus_add_device(config->host, &dev_cfg, &h->spi_device) != ESP_OK) {
+        return ESP_FAIL;
+    }
+
+    //GPIO config for the handshake line.
+    gpio_config_t io_conf = {
+        .intr_type = GPIO_INTR_ANYEDGE,
+        .mode = GPIO_MODE_INPUT,
+        .pull_up_en = 1,
+        .pin_bit_mask = BIT64(config->intr),
+    };
+
+    gpio_config(&io_conf);
+    gpio_install_isr_service(0);
+    gpio_set_intr_type(config->intr, GPIO_INTR_ANYEDGE);
+    gpio_isr_handler_add(config->intr, gpio_isr_handler, esp_netif_get_io_driver(netif));
+    return ESP_OK;
+}
+
+static void post_setup(spi_slave_transaction_t *trans)
+{
+    struct eppp_handle *h = trans->user;
+    h->slave_last_edge = esp_timer_get_time();
+    gpio_set_level(h->gpio_intr, 1);
+    if (h->transaction_size == 0) { // If no transaction planned:
+        if (h->outbound.len == 0) { // we're blocked if we don't have any data
+            h->blocked = SLAVE_BLOCKED;
+        } else {
+            h->blocked = SLAVE_WANTS_WRITE; // we notify the master that we want to write
+            esp_timer_start_once(h->timer, MIN_TRIGGER_US);
+        }
+    }
+}
+
+static void post_trans(spi_slave_transaction_t *trans)
+{
+    struct eppp_handle *h = trans->user;
+    h->blocked = NONE;
+    gpio_set_level(h->gpio_intr, 0);
+}
+
+static esp_err_t deinit_slave(esp_netif_t *netif)
+{
+    struct eppp_handle *h = esp_netif_get_io_driver(netif);
+    ESP_RETURN_ON_ERROR(spi_slave_free(h->spi_host), TAG, "Failed to free SPI slave host");
+    ESP_RETURN_ON_ERROR(spi_bus_remove_device(h->spi_device), TAG, "Failed to remove SPI device");
+    ESP_RETURN_ON_ERROR(spi_bus_free(h->spi_host), TAG, "Failed to free SPI bus");
+    return ESP_OK;
+}
+
+static esp_err_t init_slave(struct eppp_config_spi_s *config, esp_netif_t *netif)
+{
+    struct eppp_handle *h = esp_netif_get_io_driver(netif);
+    h->spi_host = config->host;
+    h->gpio_intr = config->intr;
+    spi_bus_config_t bus_cfg = {};
+    bus_cfg.mosi_io_num = config->mosi;
+    bus_cfg.miso_io_num = config->miso;
+    bus_cfg.sclk_io_num = config->sclk;
+    bus_cfg.quadwp_io_num = -1;
+    bus_cfg.quadhd_io_num = -1;
+    bus_cfg.flags = 0;
+    bus_cfg.intr_flags = 0;
+
+    //Configuration for the SPI slave interface
+    spi_slave_interface_config_t slvcfg = {
+        .mode = 0,
+        .spics_io_num = config->cs,
+        .queue_size = 3,
+        .flags = 0,
+        .post_setup_cb = post_setup,
+        .post_trans_cb = post_trans,
+    };
+
+    //Configuration for the handshake line
+    gpio_config_t io_conf = {
+        .intr_type = GPIO_INTR_DISABLE,
+        .mode = GPIO_MODE_OUTPUT,
+        .pin_bit_mask = BIT64(config->intr),
+    };
+
+    gpio_config(&io_conf);
+    gpio_set_pull_mode(config->mosi, GPIO_PULLUP_ONLY);
+    gpio_set_pull_mode(config->sclk, GPIO_PULLUP_ONLY);
+    gpio_set_pull_mode(config->cs, GPIO_PULLUP_ONLY);
+
+    //Initialize SPI slave interface
+    if (spi_slave_initialize(config->host, &bus_cfg, &slvcfg, SPI_DMA_CH_AUTO) != ESP_OK) {
+        return ESP_FAIL;
+    }
+    return ESP_OK;
+}
+
+typedef esp_err_t (*perform_transaction_t)(struct eppp_handle *h, size_t len, const void *tx_buffer, void *rx_buffer);
+
+static esp_err_t perform_transaction_master(struct eppp_handle *h, size_t len, const void *tx_buffer, void *rx_buffer)
+{
+    spi_transaction_t t = {};
+    t.length = len * 8;
+    t.tx_buffer = tx_buffer;
+    t.rx_buffer = rx_buffer;
+    return spi_device_transmit(h->spi_device, &t);
+}
+
+static esp_err_t perform_transaction_slave(struct eppp_handle *h, size_t len, const void *tx_buffer, void *rx_buffer)
+{
+    spi_slave_transaction_t t = {};
+    t.user = h;
+    t.length = len * 8;
+    t.tx_buffer = tx_buffer;
+    t.rx_buffer = rx_buffer;
+    return spi_slave_transmit(h->spi_host, &t, portMAX_DELAY);
+}
+
+esp_err_t eppp_perform(esp_netif_t *netif)
+{
+    static WORD_ALIGNED_ATTR uint8_t out_buf[TRANSFER_SIZE] = {};
+    static WORD_ALIGNED_ATTR uint8_t in_buf[TRANSFER_SIZE] = {};
+
+    struct eppp_handle *h = esp_netif_get_io_driver(netif);
+
+    // Perform transaction for master and slave
+    const perform_transaction_t perform_transaction = h->role == EPPP_CLIENT ? perform_transaction_master : perform_transaction_slave;
+
+    if (h->stop) {
+        return ESP_ERR_TIMEOUT;
+    }
+
+    BaseType_t tx_queue_stat;
+    bool allow_test_tx = false;
+    uint16_t next_tx_size = 0;
+    if (h->role == EPPP_CLIENT) {
+        // SPI MASTER only code
+        if (xSemaphoreTake(h->ready_semaphore, pdMS_TO_TICKS(1000)) != pdTRUE) {
+            // slave might not be ready, but maybe we just missed an interrupt
+            allow_test_tx = true;
+        }
+        if (h->outbound.len == 0 && h->transaction_size == 0 && h->blocked == NONE) {
+            h->blocked = MASTER_BLOCKED;
+            xQueueReceive(h->out_queue, &h->outbound, portMAX_DELAY);
+            h->blocked = NONE;
+            if (h->outbound.len == -1) {
+                h->outbound.len = 0;
+                h->blocked = MASTER_WANTS_READ;
+            }
+        } else if (h->blocked == MASTER_WANTS_READ) {
+            h->blocked = NONE;
+        }
+    }
+    struct header *head = (void *)out_buf;
+    if (h->outbound.len <= h->transaction_size && allow_test_tx == false) {
+        // sending outbound
+        head->size = h->outbound.len;
+        if (h->outbound.len > 0) {
+            memcpy(out_buf + sizeof(struct header), h->outbound.data, h->outbound.len);
+            free(h->outbound.data);
+            ESP_LOG_BUFFER_HEXDUMP(TAG, out_buf + sizeof(struct header), head->size, ESP_LOG_VERBOSE);
+            h->outbound.data = NULL;
+            h->outbound.len = 0;
+        }
+        do {
+            tx_queue_stat = xQueueReceive(h->out_queue, &h->outbound, 0);
+        } while (tx_queue_stat == pdTRUE && h->outbound.len == -1);
+        if (h->outbound.len == -1) { // used as a signal only, no actual data
+            h->outbound.len = 0;
+        }
+    } else {
+        // outbound is bigger, need to transmit in another transaction (keep this empty)
+        head->size = 0;
+    }
+    next_tx_size = head->next_size = h->outbound.len;
+    head->magic = SPI_HEADER_MAGIC;
+    head->check = esp_rom_crc16_le(0, out_buf, sizeof(struct header) - sizeof(uint16_t));
+    esp_err_t ret = perform_transaction(h, sizeof(struct header) + h->transaction_size, out_buf, in_buf);
+    if (ret != ESP_OK) {
+        ESP_LOGE(TAG, "spi_device_transmit failed");
+        h->transaction_size = 0; // need to start with HEADER only transaction
+        return ESP_FAIL;
+    }
+    head = (void *)in_buf;
+    uint16_t check = esp_rom_crc16_le(0, in_buf, sizeof(struct header) - sizeof(uint16_t));
+    if (check != head->check || head->magic != SPI_HEADER_MAGIC) {
+        h->transaction_size = 0; // need to start with HEADER only transaction
+        if (allow_test_tx) {
+            return ESP_OK;
+        }
+        ESP_LOGE(TAG, "Wrong checksum or magic");
+        return ESP_FAIL;
+    }
+    if (head->size > 0) {
+        ESP_LOG_BUFFER_HEXDUMP(TAG, in_buf + sizeof(struct header), head->size, ESP_LOG_VERBOSE);
+        esp_netif_receive(netif, in_buf + sizeof(struct header), head->size, NULL);
+    }
+    h->transaction_size = NEXT_TRANSACTION_SIZE(next_tx_size, head->next_size);
+    return ESP_OK;
+}
+
+#elif CONFIG_EPPP_LINK_DEVICE_UART
+#define BUF_SIZE (1024)
+
+static esp_err_t init_uart(struct eppp_handle *h, eppp_config_t *config)
+{
+    h->uart_port = config->uart.port;
+    uart_config_t uart_config = {};
+    uart_config.baud_rate = config->uart.baud;
+    uart_config.data_bits = UART_DATA_8_BITS;
+    uart_config.parity    = UART_PARITY_DISABLE;
+    uart_config.stop_bits = UART_STOP_BITS_1;
+    uart_config.flow_ctrl = UART_HW_FLOWCTRL_DISABLE;
+    uart_config.source_clk = UART_SCLK_DEFAULT;
+
+    ESP_RETURN_ON_ERROR(uart_driver_install(h->uart_port, config->uart.rx_buffer_size, 0, config->uart.queue_size, &h->uart_event_queue, 0), TAG, "Failed to install UART");
+    ESP_RETURN_ON_ERROR(uart_param_config(h->uart_port, &uart_config), TAG, "Failed to set params");
+    ESP_RETURN_ON_ERROR(uart_set_pin(h->uart_port, config->uart.tx_io, config->uart.rx_io, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE), TAG, "Failed to set UART pins");
+    ESP_RETURN_ON_ERROR(uart_set_rx_timeout(h->uart_port, 1), TAG, "Failed to set UART Rx timeout");
+    return ESP_OK;
+}
+
+static void deinit_uart(struct eppp_handle *h)
+{
+    uart_driver_delete(h->uart_port);
+}
+
+esp_err_t eppp_perform(esp_netif_t *netif)
+{
+    static uint8_t buffer[BUF_SIZE] = {};
+    struct eppp_handle *h = esp_netif_get_io_driver(netif);
+    uart_event_t event = {};
+    if (h->stop) {
+        return ESP_ERR_TIMEOUT;
+    }
+
+    if (xQueueReceive(h->uart_event_queue, &event, pdMS_TO_TICKS(100)) != pdTRUE) {
+        return ESP_OK;
+    }
+    if (event.type == UART_DATA) {
+        size_t len;
+        uart_get_buffered_data_len(h->uart_port, &len);
+        if (len) {
+            len = uart_read_bytes(h->uart_port, buffer, BUF_SIZE, 0);
+            ESP_LOG_BUFFER_HEXDUMP("ppp_uart_recv", buffer, len, ESP_LOG_VERBOSE);
+            esp_netif_receive(netif, buffer, len, NULL);
+        }
+    } else {
+        ESP_LOGW(TAG, "Received UART event: %d", event.type);
+    }
+    return ESP_OK;
+}
+
+#endif // CONFIG_EPPP_LINK_DEVICE_SPI / UART
+
+static void ppp_task(void *args)
+{
+    esp_netif_t *netif = args;
+    while (eppp_perform(netif) != ESP_ERR_TIMEOUT) {}
+    struct eppp_handle *h = esp_netif_get_io_driver(netif);
+    h->exited = true;
+    vTaskDelete(NULL);
+}
+
+static bool have_some_eppp_netif(esp_netif_t *netif, void *ctx)
+{
+    return get_netif_num(netif) > 0;
+}
+
+static void remove_handlers(void)
+{
+    esp_netif_t *netif = esp_netif_find_if(have_some_eppp_netif, NULL);
+    if (netif == NULL) {
+        // if EPPP netif in the system, we cleanup the statics
+        vEventGroupDelete(s_event_group);
+        s_event_group = NULL;
+        esp_event_handler_unregister(IP_EVENT, ESP_EVENT_ANY_ID, on_ip_event);
+        esp_event_handler_unregister(NETIF_PPP_STATUS, ESP_EVENT_ANY_ID, on_ppp_event);
+    }
+}
+
+void eppp_deinit(esp_netif_t *netif)
+{
+    if (netif == NULL) {
+        return;
+    }
+#if CONFIG_EPPP_LINK_DEVICE_SPI
+    struct eppp_handle *h = esp_netif_get_io_driver(netif);
+    if (h->role == EPPP_CLIENT) {
+        deinit_master(netif);
+    } else {
+        deinit_slave(netif);
+    }
+#elif CONFIG_EPPP_LINK_DEVICE_UART
+    deinit_uart(esp_netif_get_io_driver(netif));
+#endif
+    netif_deinit(netif);
+}
+
+esp_netif_t *eppp_init(eppp_type_t role, eppp_config_t *config)
+{
+    esp_netif_t *netif = netif_init(role);
+    if (!netif) {
+        ESP_LOGE(TAG, "Failed to initialize PPP netif");
+        remove_handlers();
+        return NULL;
+    }
+    esp_netif_ppp_config_t netif_params;
+    ESP_ERROR_CHECK(esp_netif_ppp_get_params(netif, &netif_params));
+    netif_params.ppp_our_ip4_addr = config->ppp.our_ip4_addr;
+    netif_params.ppp_their_ip4_addr = config->ppp.their_ip4_addr;
+    netif_params.ppp_error_event_enabled = true;
+    ESP_ERROR_CHECK(esp_netif_ppp_set_params(netif, &netif_params));
+#if CONFIG_EPPP_LINK_DEVICE_SPI
+    if (role == EPPP_CLIENT) {
+        init_master(&config->spi, netif);
+    } else {
+        init_slave(&config->spi, netif);
+
+    }
+#elif CONFIG_EPPP_LINK_DEVICE_UART
+    init_uart(esp_netif_get_io_driver(netif), config);
+#endif
+    return netif;
+}
+
+esp_netif_t *eppp_open(eppp_type_t role, eppp_config_t *config, int connect_timeout_ms)
+{
+#if CONFIG_EPPP_LINK_DEVICE_UART
+    if (config->transport != EPPP_TRANSPORT_UART) {
+        ESP_LOGE(TAG, "Invalid transport: UART device must be enabled in Kconfig");
+        return NULL;
+    }
+#endif
+#if CONFIG_EPPP_LINK_DEVICE_SPI
+    if (config->transport != EPPP_TRANSPORT_SPI) {
+        ESP_LOGE(TAG, "Invalid transport: SPI device must be enabled in Kconfig");
+        return NULL;
+    }
+#endif
+
+    if (config->task.run_task == false) {
+        ESP_LOGE(TAG, "task.run_task == false is invalid in this API. Please use eppp_init()");
+        return NULL;
+    }
+    if (s_event_group == NULL) {
+        s_event_group = xEventGroupCreate();
+        if (esp_event_handler_register(IP_EVENT, ESP_EVENT_ANY_ID, on_ip_event, NULL) != ESP_OK) {
+            ESP_LOGE(TAG, "Failed to register IP event handler");
+            remove_handlers();
+            return NULL;
+        }
+        if (esp_event_handler_register(NETIF_PPP_STATUS, ESP_EVENT_ANY_ID, on_ppp_event, NULL) !=  ESP_OK) {
+            ESP_LOGE(TAG, "Failed to register PPP status handler");
+            remove_handlers();
+            return NULL;
+        }
+    }
+    esp_netif_t *netif = eppp_init(role, config);
+    if (!netif) {
+        remove_handlers();
+        return NULL;
+    }
+
+    eppp_netif_start(netif);
+
+    if (xTaskCreate(ppp_task, "ppp connect", config->task.stack_size, netif, config->task.priority, NULL) != pdTRUE) {
+        ESP_LOGE(TAG, "Failed to create a ppp connection task");
+        eppp_deinit(netif);
+        return NULL;
+    }
+    int netif_cnt = get_netif_num(netif);
+    if (netif_cnt < 0) {
+        eppp_close(netif);
+        return NULL;
+    }
+    ESP_LOGI(TAG, "Waiting for IP address %d", netif_cnt);
+    EventBits_t bits = xEventGroupWaitBits(s_event_group, CONNECT_BITS << (netif_cnt * 2), pdFALSE, pdFALSE, pdMS_TO_TICKS(connect_timeout_ms));
+    if (bits & (CONNECTION_FAILED << (netif_cnt * 2))) {
+        ESP_LOGE(TAG, "Connection failed!");
+        eppp_close(netif);
+        return NULL;
+    }
+    ESP_LOGI(TAG, "Connected! %d", netif_cnt);
+    return netif;
+}
+
+esp_netif_t *eppp_connect(eppp_config_t *config)
+{
+    return eppp_open(EPPP_CLIENT, config, portMAX_DELAY);
+}
+
+esp_netif_t *eppp_listen(eppp_config_t *config)
+{
+    return eppp_open(EPPP_SERVER, config, portMAX_DELAY);
+}
+
+void eppp_close(esp_netif_t *netif)
+{
+    struct eppp_handle *h = esp_netif_get_io_driver(netif);
+    if (eppp_netif_stop(netif, 60000) != ESP_OK) {
+        ESP_LOGE(TAG, "Network didn't exit cleanly");
+    }
+    h->stop = true;
+    for (int wait = 0; wait < 100; wait++) {
+        vTaskDelay(pdMS_TO_TICKS(10));
+        if (h->exited) {
+            break;
+        }
+    }
+    if (!h->exited) {
+        ESP_LOGE(TAG, "Cannot stop ppp_task");
+    }
+    eppp_deinit(netif);
+    remove_handlers();
+}

components/eppp_link/examples/host/CMakeLists.txt

@@ -0,0 +1,8 @@
+# The following four lines of boilerplate have to be in your project's CMakeLists
+# in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.16)
+set(EXTRA_COMPONENT_DIRS $ENV{IDF_PATH}/examples/common_components/iperf)
+
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(pppos_host)

components/eppp_link/examples/host/README.md

@@ -0,0 +1,9 @@
+
+# Client side demo of ESP-PPP-Link
+
+This is a basic demo of using esp-mqtt library, but connects to the internet using a PPPoS client. To run this example, you would need a PPP server that provides connectivity to the MQTT broker used in this example (by default a public broker accessible on the internet).
+
+If configured, this example could also run a ping session and an iperf console.
+
+
+The PPP server could be a Linux computer with `pppd` service or an ESP32 acting like a connection gateway with PPPoS server (see the "slave" project).

components/eppp_link/examples/host/main/CMakeLists.txt

@@ -0,0 +1,2 @@
+idf_component_register(SRCS app_main.c register_iperf.c
+                    INCLUDE_DIRS ".")

components/eppp_link/examples/host/main/Kconfig.projbuild

@@ -0,0 +1,53 @@
+menu "Example Configuration"
+
+    config EXAMPLE_GLOBAL_DNS
+        hex "Set global DNS server"
+        range 0 0xFFFFFFFF
+        default 0x08080808
+        help
+            Global DNS server address.
+
+    config EXAMPLE_MQTT
+        bool "Run mqtt example"
+        default y
+        help
+            Run MQTT client after startup.
+
+    config EXAMPLE_BROKER_URL
+        string "Broker URL"
+        depends on EXAMPLE_MQTT
+        default "mqtt://mqtt.eclipseprojects.io"
+        help
+            URL of the broker to connect to.
+
+    config EXAMPLE_IPERF
+        bool "Run iperf"
+        default y
+        help
+            Init and run iperf console.
+
+    config EXAMPLE_UART_TX_PIN
+        int "TXD Pin Number"
+        depends on EPPP_LINK_DEVICE_UART
+        default 10
+        range 0 31
+        help
+            Pin number of UART TX.
+
+    config EXAMPLE_UART_RX_PIN
+        int "RXD Pin Number"
+        depends on EPPP_LINK_DEVICE_UART
+        default 11
+        range 0 31
+        help
+            Pin number of UART RX.
+
+    config EXAMPLE_UART_BAUDRATE
+        int "Baudrate"
+        depends on EPPP_LINK_DEVICE_UART
+        default 2000000
+        range 0 4000000
+        help
+            Baudrate used by the PPP over UART
+
+endmenu

components/eppp_link/examples/host/main/app_main.c

@@ -0,0 +1,149 @@
+/*
+ * SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <string.h>
+#include "esp_system.h"
+#include "nvs_flash.h"
+#include "esp_event.h"
+#include "esp_netif.h"
+#include "eppp_link.h"
+#include "esp_log.h"
+#include "mqtt_client.h"
+#include "console_ping.h"
+
+void register_iperf(void);
+
+static const char *TAG = "eppp_host_example";
+
+#if CONFIG_EXAMPLE_MQTT
+static void mqtt_event_handler(void *args, esp_event_base_t base, int32_t event_id, void *event_data)
+{
+    ESP_LOGD(TAG, "Event dispatched from event loop base=%s, event_id=%" PRIi32 "", base, event_id);
+    esp_mqtt_event_handle_t event = event_data;
+    esp_mqtt_client_handle_t client = event->client;
+    int msg_id;
+    switch ((esp_mqtt_event_id_t)event_id) {
+    case MQTT_EVENT_CONNECTED:
+        ESP_LOGI(TAG, "MQTT_EVENT_CONNECTED");
+        msg_id = esp_mqtt_client_publish(client, "/topic/qos1", "data_3", 0, 1, 0);
+        ESP_LOGI(TAG, "sent publish successful, msg_id=%d", msg_id);
+
+        msg_id = esp_mqtt_client_subscribe(client, "/topic/qos0", 0);
+        ESP_LOGI(TAG, "sent subscribe successful, msg_id=%d", msg_id);
+
+        msg_id = esp_mqtt_client_subscribe(client, "/topic/qos1", 1);
+        ESP_LOGI(TAG, "sent subscribe successful, msg_id=%d", msg_id);
+
+        msg_id = esp_mqtt_client_unsubscribe(client, "/topic/qos1");
+        ESP_LOGI(TAG, "sent unsubscribe successful, msg_id=%d", msg_id);
+        break;
+    case MQTT_EVENT_DISCONNECTED:
+        ESP_LOGI(TAG, "MQTT_EVENT_DISCONNECTED");
+        break;
+
+    case MQTT_EVENT_SUBSCRIBED:
+        ESP_LOGI(TAG, "MQTT_EVENT_SUBSCRIBED, msg_id=%d", event->msg_id);
+        msg_id = esp_mqtt_client_publish(client, "/topic/qos0", "data", 0, 0, 0);
+        ESP_LOGI(TAG, "sent publish successful, msg_id=%d", msg_id);
+        break;
+    case MQTT_EVENT_UNSUBSCRIBED:
+        ESP_LOGI(TAG, "MQTT_EVENT_UNSUBSCRIBED, msg_id=%d", event->msg_id);
+        break;
+    case MQTT_EVENT_PUBLISHED:
+        ESP_LOGI(TAG, "MQTT_EVENT_PUBLISHED, msg_id=%d", event->msg_id);
+        break;
+    case MQTT_EVENT_DATA:
+        ESP_LOGI(TAG, "MQTT_EVENT_DATA");
+        printf("TOPIC=%.*s\r\n", event->topic_len, event->topic);
+        printf("DATA=%.*s\r\n", event->data_len, event->data);
+        break;
+    case MQTT_EVENT_ERROR:
+        ESP_LOGI(TAG, "MQTT_EVENT_ERROR");
+        if (event->error_handle->error_type == MQTT_ERROR_TYPE_TCP_TRANSPORT) {
+            ESP_LOGI(TAG, "Last errno string (%s)", strerror(event->error_handle->esp_transport_sock_errno));
+        }
+        break;
+    default:
+        ESP_LOGI(TAG, "Other event id:%d", event->event_id);
+        break;
+    }
+}
+
+static void mqtt_app_start(void)
+{
+    esp_mqtt_client_config_t mqtt_cfg = {
+        .broker.address.uri = "mqtt://mqtt.eclipseprojects.io",
+    };
+
+    esp_mqtt_client_handle_t client = esp_mqtt_client_init(&mqtt_cfg);
+    /* The last argument may be used to pass data to the event handler, in this example mqtt_event_handler */
+    esp_mqtt_client_register_event(client, ESP_EVENT_ANY_ID, mqtt_event_handler, NULL);
+    esp_mqtt_client_start(client);
+}
+#endif // MQTT
+
+
+void app_main(void)
+{
+    ESP_LOGI(TAG, "[APP] Startup..");
+    ESP_LOGI(TAG, "[APP] Free memory: %" PRIu32 " bytes", esp_get_free_heap_size());
+    ESP_LOGI(TAG, "[APP] IDF version: %s", esp_get_idf_version());
+
+    ESP_ERROR_CHECK(nvs_flash_init());
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+
+    /* Sets up the default EPPP-connection
+     */
+    eppp_config_t config = EPPP_DEFAULT_CLIENT_CONFIG();
+#if CONFIG_EPPP_LINK_DEVICE_SPI
+    config.transport = EPPP_TRANSPORT_SPI;
+#else
+    config.transport = EPPP_TRANSPORT_UART;
+    config.uart.tx_io = CONFIG_EXAMPLE_UART_TX_PIN;
+    config.uart.rx_io = CONFIG_EXAMPLE_UART_RX_PIN;
+    config.uart.baud = CONFIG_EXAMPLE_UART_BAUDRATE;
+#endif
+    esp_netif_t *eppp_netif = eppp_connect(&config);
+    if (eppp_netif == NULL) {
+        ESP_LOGE(TAG, "Failed to connect");
+        return ;
+    }
+    // Setup global DNS
+    esp_netif_dns_info_t dns;
+    dns.ip.u_addr.ip4.addr = esp_netif_htonl(CONFIG_EXAMPLE_GLOBAL_DNS);
+    dns.ip.type = ESP_IPADDR_TYPE_V4;
+    ESP_ERROR_CHECK(esp_netif_set_dns_info(eppp_netif, ESP_NETIF_DNS_MAIN, &dns));
+
+    // Initialize console REPL
+    ESP_ERROR_CHECK(console_cmd_init());
+
+#if CONFIG_EXAMPLE_IPERF
+    register_iperf();
+
+    printf("\n =======================================================\n");
+    printf(" |       Steps to Test EPPP-host bandwidth             |\n");
+    printf(" |                                                     |\n");
+    printf(" |  1. Wait for the ESP32 to get an IP                 |\n");
+    printf(" |  2. Server: 'iperf -u -s -i 3' (on host)            |\n");
+    printf(" |  3. Client: 'iperf -u -c SERVER_IP -t 60 -i 3'      |\n");
+    printf(" |                                                     |\n");
+    printf(" =======================================================\n\n");
+
+#endif // CONFIG_EXAMPLE_IPERF
+
+    // Register the ping command
+    ESP_ERROR_CHECK(console_cmd_ping_register());
+    // start console REPL
+    ESP_ERROR_CHECK(console_cmd_start());
+
+#if CONFIG_EXAMPLE_MQTT
+    mqtt_app_start();
+#endif
+}

components/eppp_link/examples/host/main/idf_component.yml

@@ -0,0 +1,6 @@
+dependencies:
+  espressif/eppp_link:
+    version: "*"
+    override_path: "../../.."
+  console_cmd_ping:
+    version: "*"

components/eppp_link/examples/host/main/register_iperf.c

@@ -0,0 +1,179 @@
+/*
+ * SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/event_groups.h"
+#include "sys/socket.h" // for INADDR_ANY
+#include "esp_netif.h"
+#include "esp_log.h"
+#include "esp_system.h"
+#include "esp_event.h"
+#include "esp_log.h"
+#include "esp_netif.h"
+#include "esp_netif_ppp.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/event_groups.h"
+
+#include "esp_console.h"
+#include "esp_event.h"
+#include "esp_bit_defs.h"
+#include "argtable3/argtable3.h"
+#include "iperf.h"
+#include "sdkconfig.h"
+
+/* "iperf" command */
+
+static struct {
+    struct arg_str *ip;
+    struct arg_lit *server;
+    struct arg_lit *udp;
+    struct arg_lit *version;
+    struct arg_int *port;
+    struct arg_int *length;
+    struct arg_int *interval;
+    struct arg_int *time;
+    struct arg_int *bw_limit;
+    struct arg_lit *abort;
+    struct arg_end *end;
+} iperf_args;
+
+static int ppp_cmd_iperf(int argc, char **argv)
+{
+    int nerrors = arg_parse(argc, argv, (void **)&iperf_args);
+    // ethernet iperf only support IPV4 address
+    iperf_cfg_t cfg = {.type = IPERF_IP_TYPE_IPV4};
+
+    if (nerrors != 0) {
+        arg_print_errors(stderr, iperf_args.end, argv[0]);
+        return 0;
+    }
+
+    /* iperf -a */
+    if (iperf_args.abort->count != 0) {
+        iperf_stop();
+        return 0;
+    }
+
+    if (((iperf_args.ip->count == 0) && (iperf_args.server->count == 0)) ||
+            ((iperf_args.ip->count != 0) && (iperf_args.server->count != 0))) {
+        ESP_LOGE(__func__, "Wrong mode! ESP32 should run in client or server mode");
+        return 0;
+    }
+
+    /* iperf -s */
+    if (iperf_args.ip->count == 0) {
+        cfg.flag |= IPERF_FLAG_SERVER;
+    }
+    /* iperf -c SERVER_ADDRESS */
+    else {
+        cfg.destination_ip4 = esp_ip4addr_aton(iperf_args.ip->sval[0]);
+        cfg.flag |= IPERF_FLAG_CLIENT;
+    }
+
+    if (iperf_args.length->count == 0) {
+        cfg.len_send_buf = 0;
+    } else {
+        cfg.len_send_buf = iperf_args.length->ival[0];
+    }
+
+    cfg.source_ip4 = INADDR_ANY;
+
+    /* iperf -u */
+    if (iperf_args.udp->count == 0) {
+        cfg.flag |= IPERF_FLAG_TCP;
+    } else {
+        cfg.flag |= IPERF_FLAG_UDP;
+    }
+
+    /* iperf -p */
+    if (iperf_args.port->count == 0) {
+        cfg.sport = IPERF_DEFAULT_PORT;
+        cfg.dport = IPERF_DEFAULT_PORT;
+    } else {
+        if (cfg.flag & IPERF_FLAG_SERVER) {
+            cfg.sport = iperf_args.port->ival[0];
+            cfg.dport = IPERF_DEFAULT_PORT;
+        } else {
+            cfg.sport = IPERF_DEFAULT_PORT;
+            cfg.dport = iperf_args.port->ival[0];
+        }
+    }
+
+    /* iperf -i */
+    if (iperf_args.interval->count == 0) {
+        cfg.interval = IPERF_DEFAULT_INTERVAL;
+    } else {
+        cfg.interval = iperf_args.interval->ival[0];
+        if (cfg.interval <= 0) {
+            cfg.interval = IPERF_DEFAULT_INTERVAL;
+        }
+    }
+
+    /* iperf -t */
+    if (iperf_args.time->count == 0) {
+        cfg.time = IPERF_DEFAULT_TIME;
+    } else {
+        cfg.time = iperf_args.time->ival[0];
+        if (cfg.time <= cfg.interval) {
+            cfg.time = cfg.interval;
+        }
+    }
+
+    /* iperf -b */
+    if (iperf_args.bw_limit->count == 0) {
+        cfg.bw_lim = IPERF_DEFAULT_NO_BW_LIMIT;
+    } else {
+        cfg.bw_lim = iperf_args.bw_limit->ival[0];
+        if (cfg.bw_lim <= 0) {
+            cfg.bw_lim = IPERF_DEFAULT_NO_BW_LIMIT;
+        }
+    }
+
+    printf("mode=%s-%s sip=" IPSTR ":%" PRIu16 ", dip=%" PRIu32 ".%" PRIu32 ".%" PRIu32 ".%" PRIu32 ":%" PRIu16 ", interval=%" PRIu32 ", time=%" PRIu32 "\r\n",
+           cfg.flag & IPERF_FLAG_TCP ? "tcp" : "udp",
+           cfg.flag & IPERF_FLAG_SERVER ? "server" : "client",
+           (uint16_t) cfg.source_ip4 & 0xFF,
+           (uint16_t) (cfg.source_ip4 >> 8) & 0xFF,
+           (uint16_t) (cfg.source_ip4 >> 16) & 0xFF,
+           (uint16_t) (cfg.source_ip4 >> 24) & 0xFF,
+           cfg.sport,
+           cfg.destination_ip4 & 0xFF, (cfg.destination_ip4 >> 8) & 0xFF,
+           (cfg.destination_ip4 >> 16) & 0xFF, (cfg.destination_ip4 >> 24) & 0xFF, cfg.dport,
+           cfg.interval, cfg.time);
+
+    iperf_start(&cfg);
+    return 0;
+}
+
+void register_iperf(void)
+{
+
+    iperf_args.ip = arg_str0("c", "client", "<ip>",
+                             "run in client mode, connecting to <host>");
+    iperf_args.server = arg_lit0("s", "server", "run in server mode");
+    iperf_args.udp = arg_lit0("u", "udp", "use UDP rather than TCP");
+    iperf_args.version = arg_lit0("V", "ipv6_domain", "use IPV6 address rather than IPV4");
+    iperf_args.port = arg_int0("p", "port", "<port>",
+                               "server port to listen on/connect to");
+    iperf_args.length = arg_int0("l", "len", "<length>", "set read/write buffer size");
+    iperf_args.interval = arg_int0("i", "interval", "<interval>",
+                                   "seconds between periodic bandwidth reports");
+    iperf_args.time = arg_int0("t", "time", "<time>", "time in seconds to transmit for (default 10 secs)");
+    iperf_args.bw_limit = arg_int0("b", "bandwidth", "<bandwidth>", "bandwidth to send at in Mbits/sec");
+    iperf_args.abort = arg_lit0("a", "abort", "abort running iperf");
+    iperf_args.end = arg_end(1);
+    const esp_console_cmd_t iperf_cmd = {
+        .command = "iperf",
+        .help = "iperf command",
+        .hint = NULL,
+        .func = &ppp_cmd_iperf,
+        .argtable = &iperf_args
+    };
+    ESP_ERROR_CHECK(esp_console_cmd_register(&iperf_cmd));
+}

components/eppp_link/examples/host/sdkconfig.ci.spi

@@ -0,0 +1 @@
+CONFIG_EPPP_LINK_DEVICE_SPI=y

components/eppp_link/examples/host/sdkconfig.ci.uart

@@ -0,0 +1 @@
+CONFIG_EPPP_LINK_DEVICE_UART=y

components/eppp_link/examples/host/sdkconfig.defaults

@@ -0,0 +1,4 @@
+CONFIG_LWIP_PPP_SUPPORT=y
+CONFIG_LWIP_PPP_SERVER_SUPPORT=y
+CONFIG_LWIP_PPP_VJ_HEADER_COMPRESSION=n
+CONFIG_LWIP_PPP_DEBUG_ON=y

components/eppp_link/examples/slave/CMakeLists.txt

@@ -0,0 +1,6 @@
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.16)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(pppos_slave)

components/eppp_link/examples/slave/README.md

@@ -0,0 +1,7 @@
+
+# Wi-Fi station to PPPoS server
+
+This example demonstrate using NAPT to bring connectivity from WiFi station to PPPoS server.
+
+This example expect a PPPoS client to connect to the server and use the connectivity.
+The client could be a Linux computer with `pppd` service or another microcontroller with PPP client (or another ESP32 with not WiFi interface)

components/eppp_link/examples/slave/main/CMakeLists.txt

@@ -0,0 +1,2 @@
+idf_component_register(SRCS "eppp_slave.c"
+                    INCLUDE_DIRS ".")

components/eppp_link/examples/slave/main/Kconfig.projbuild

@@ -0,0 +1,45 @@
+menu "Example Configuration"
+
+    config ESP_WIFI_SSID
+        string "WiFi SSID"
+        default "myssid"
+        help
+            SSID (network name) for the example to connect to.
+
+    config ESP_WIFI_PASSWORD
+        string "WiFi Password"
+        default "mypassword"
+        help
+            WiFi password (WPA or WPA2) for the example to use.
+
+    config ESP_MAXIMUM_RETRY
+        int "Maximum retry"
+        default 5
+        help
+            Set the Maximum retry to avoid station reconnecting to the AP unlimited when the AP is really inexistent.
+
+    config EXAMPLE_UART_TX_PIN
+        int "TXD Pin Number"
+        depends on EPPP_LINK_DEVICE_UART
+        default 11
+        range 0 31
+        help
+            Pin number of UART TX.
+
+    config EXAMPLE_UART_RX_PIN
+        int "RXD Pin Number"
+        depends on EPPP_LINK_DEVICE_UART
+        default 10
+        range 0 31
+        help
+            Pin number of UART RX.
+
+    config EXAMPLE_UART_BAUDRATE
+        int "Baudrate"
+        depends on EPPP_LINK_DEVICE_UART
+        default 2000000
+        range 0 4000000
+        help
+            Baudrate used by the PPP over UART
+
+endmenu

components/eppp_link/examples/slave/main/eppp_slave.c

@@ -0,0 +1,147 @@
+/*
+ * SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+
+#include <string.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/event_groups.h"
+#include "esp_system.h"
+#include "esp_wifi.h"
+#include "esp_event.h"
+#include "esp_log.h"
+#include "nvs_flash.h"
+#include "eppp_link.h"
+
+static const char *TAG = "eppp_slave";
+
+#if CONFIG_SOC_WIFI_SUPPORTED
+
+/* FreeRTOS event group to signal when we are connected*/
+static EventGroupHandle_t s_wifi_event_group;
+
+/* The event group allows multiple bits for each event, but we only care about two events:
+ * - we are connected to the AP with an IP
+ * - we failed to connect after the maximum amount of retries */
+#define WIFI_CONNECTED_BIT BIT0
+#define WIFI_FAIL_BIT      BIT1
+
+
+static int s_retry_num = 0;
+
+static void event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data)
+{
+    if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
+        esp_wifi_connect();
+    } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
+        if (s_retry_num < CONFIG_ESP_MAXIMUM_RETRY) {
+            esp_wifi_connect();
+            s_retry_num++;
+            ESP_LOGI(TAG, "retry to connect to the AP");
+        } else {
+            xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
+        }
+        ESP_LOGI(TAG, "connect to the AP fail");
+    } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
+        ip_event_got_ip_t *event = (ip_event_got_ip_t *) event_data;
+        ESP_LOGI(TAG, "got ip:" IPSTR, IP2STR(&event->ip_info.ip));
+        s_retry_num = 0;
+        xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
+    }
+}
+
+void init_network_interface(void)
+{
+    s_wifi_event_group = xEventGroupCreate();
+
+    ESP_ERROR_CHECK(esp_netif_init());
+
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    esp_netif_create_default_wifi_sta();
+
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
+
+    esp_event_handler_instance_t instance_any_id;
+    esp_event_handler_instance_t instance_got_ip;
+    ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT,
+                    ESP_EVENT_ANY_ID,
+                    &event_handler,
+                    NULL,
+                    &instance_any_id));
+    ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT,
+                    IP_EVENT_STA_GOT_IP,
+                    &event_handler,
+                    NULL,
+                    &instance_got_ip));
+
+    wifi_config_t wifi_config = {
+        .sta = {
+            .ssid = CONFIG_ESP_WIFI_SSID,
+            .password = CONFIG_ESP_WIFI_PASSWORD,
+        },
+    };
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA) );
+    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config) );
+    ESP_ERROR_CHECK(esp_wifi_start() );
+
+    ESP_LOGI(TAG, "wifi_init_sta finished.");
+
+    /* Waiting until either the connection is established (WIFI_CONNECTED_BIT) or connection failed for the maximum
+     * number of re-tries (WIFI_FAIL_BIT). The bits are set by event_handler() (see above) */
+    EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group,
+                                           WIFI_CONNECTED_BIT | WIFI_FAIL_BIT,
+                                           pdFALSE,
+                                           pdFALSE,
+                                           portMAX_DELAY);
+
+    /* xEventGroupWaitBits() returns the bits before the call returned, hence we can test which event actually
+     * happened. */
+    if (bits & WIFI_CONNECTED_BIT) {
+        ESP_LOGI(TAG, "connected to ap SSID:%s password:%s",
+                 CONFIG_ESP_WIFI_SSID, CONFIG_ESP_WIFI_PASSWORD);
+    } else if (bits & WIFI_FAIL_BIT) {
+        ESP_LOGI(TAG, "Failed to connect to SSID:%s, password:%s",
+                 CONFIG_ESP_WIFI_SSID, CONFIG_ESP_WIFI_PASSWORD);
+    } else {
+        ESP_LOGE(TAG, "UNEXPECTED EVENT");
+    }
+}
+#else
+
+void init_network_interface(void)
+{
+    // placeholder to initialize any other network interface if WiFi is not available
+}
+
+#endif // SoC WiFi capable chip
+
+void app_main(void)
+{
+    //Initialize NVS
+    esp_err_t ret = nvs_flash_init();
+    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
+        ESP_ERROR_CHECK(nvs_flash_erase());
+        ret = nvs_flash_init();
+    }
+    ESP_ERROR_CHECK(ret);
+
+    init_network_interface();   // WiFi station if withing SoC capabilities (otherwise a placeholder)
+
+    eppp_config_t config = EPPP_DEFAULT_SERVER_CONFIG();
+#if CONFIG_EPPP_LINK_DEVICE_SPI
+    config.transport = EPPP_TRANSPORT_SPI;
+#else
+    config.transport = EPPP_TRANSPORT_UART;
+    config.uart.tx_io = CONFIG_EXAMPLE_UART_TX_PIN;
+    config.uart.rx_io = CONFIG_EXAMPLE_UART_RX_PIN;
+    config.uart.baud = CONFIG_EXAMPLE_UART_BAUDRATE;
+#endif
+    esp_netif_t *eppp_netif = eppp_listen(&config);
+    if (eppp_netif == NULL) {
+        ESP_LOGE(TAG, "Failed to setup connection");
+        return ;
+    }
+    ESP_ERROR_CHECK(esp_netif_napt_enable(eppp_netif));
+}

components/eppp_link/examples/slave/main/idf_component.yml

@@ -0,0 +1,4 @@
+dependencies:
+  espressif/eppp_link:
+    version: "*"
+    override_path: "../../.."

components/eppp_link/examples/slave/sdkconfig.ci.spi

@@ -0,0 +1 @@
+CONFIG_EPPP_LINK_DEVICE_SPI=y

components/eppp_link/examples/slave/sdkconfig.ci.uart

@@ -0,0 +1 @@
+CONFIG_EPPP_LINK_DEVICE_UART=y

components/eppp_link/examples/slave/sdkconfig.defaults

@@ -0,0 +1,6 @@
+CONFIG_LWIP_IP_FORWARD=y
+CONFIG_LWIP_IPV4_NAPT=y
+CONFIG_LWIP_TCPIP_TASK_STACK_SIZE=4096
+CONFIG_LWIP_PPP_SUPPORT=y
+CONFIG_LWIP_PPP_SERVER_SUPPORT=y
+CONFIG_LWIP_PPP_VJ_HEADER_COMPRESSION=n

components/eppp_link/idf_component.yml

@@ -0,0 +1,6 @@
+version: 0.0.1
+url: https://github.com/espressif/esp-protocols/tree/master/components/eppp_link
+description: The component provides a general purpose PPP connectivity, typically used as WiFi-PPP router
+dependencies:
+  idf:
+    version: '>=5.2'

components/eppp_link/include/eppp_link.h

@@ -0,0 +1,111 @@
+/*
+ * SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#define EPPP_DEFAULT_SERVER_IP() ESP_IP4TOADDR(192, 168, 11, 1)
+#define EPPP_DEFAULT_CLIENT_IP() ESP_IP4TOADDR(192, 168, 11, 2)
+
+#define EPPP_DEFAULT_CONFIG(our_ip, their_ip) { \
+    .transport = EPPP_TRANSPORT_UART,           \
+    .spi = {                                    \
+            .host = 1,                          \
+            .mosi = 11,                         \
+            .miso = 13,                         \
+            .sclk = 12,                         \
+            .cs = 10,                           \
+            .intr = 2,                          \
+            .freq = 16*1000*1000,               \
+            .input_delay_ns = 0,                \
+            .cs_ena_pretrans = 0,               \
+            .cs_ena_posttrans = 0,              \
+    },                                          \
+    .uart = {   \
+            .port = 1,          \
+            .baud = 921600,     \
+            .tx_io = 25,        \
+            .rx_io = 26,        \
+            .queue_size = 16,   \
+            .rx_buffer_size = 1024, \
+    },  \
+    . task = {                  \
+            .run_task = true,   \
+            .stack_size = 4096, \
+            .priority = 8,      \
+    },  \
+    . ppp = {   \
+            .our_ip4_addr.addr = our_ip,     \
+            .their_ip4_addr.addr = their_ip, \
+    }   \
+}
+
+#define EPPP_DEFAULT_SERVER_CONFIG() EPPP_DEFAULT_CONFIG(EPPP_DEFAULT_SERVER_IP(), EPPP_DEFAULT_CLIENT_IP())
+#define EPPP_DEFAULT_CLIENT_CONFIG() EPPP_DEFAULT_CONFIG(EPPP_DEFAULT_CLIENT_IP(), EPPP_DEFAULT_SERVER_IP())
+
+typedef enum eppp_type {
+    EPPP_SERVER,
+    EPPP_CLIENT,
+} eppp_type_t;
+
+typedef enum eppp_transport {
+    EPPP_TRANSPORT_UART,
+    EPPP_TRANSPORT_SPI,
+} eppp_transport_t;
+
+
+typedef struct eppp_config_t {
+    eppp_transport_t transport;
+
+    struct eppp_config_spi_s {
+        int host;
+        int mosi;
+        int miso;
+        int sclk;
+        int cs;
+        int intr;
+        int freq;
+        int input_delay_ns;
+        int cs_ena_pretrans;
+        int cs_ena_posttrans;
+    } spi;
+
+    struct eppp_config_uart_s {
+        int port;
+        int baud;
+        int tx_io;
+        int rx_io;
+        int queue_size;
+        int rx_buffer_size;
+    } uart;
+
+    struct eppp_config_task_s {
+        bool run_task;
+        int stack_size;
+        int priority;
+    } task;
+
+    struct eppp_config_pppos_s {
+        esp_ip4_addr_t our_ip4_addr;
+        esp_ip4_addr_t their_ip4_addr;
+    } ppp;
+
+} eppp_config_t;
+
+esp_netif_t *eppp_connect(eppp_config_t *config);
+
+esp_netif_t *eppp_listen(eppp_config_t *config);
+
+void eppp_close(esp_netif_t *netif);
+
+esp_netif_t *eppp_init(eppp_type_t role, eppp_config_t *config);
+
+void eppp_deinit(esp_netif_t *netif);
+
+esp_netif_t *eppp_open(eppp_type_t role, eppp_config_t *config, int connect_timeout_ms);
+
+esp_err_t eppp_netif_stop(esp_netif_t *netif, int stop_timeout_ms);
+
+esp_err_t eppp_netif_start(esp_netif_t *netif);
+
+esp_err_t eppp_perform(esp_netif_t *netif);

components/eppp_link/test/test_app/CMakeLists.txt

@@ -0,0 +1,7 @@
+# The following four lines of boilerplate have to be in your project's CMakeLists
+# in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.16)
+set(EXTRA_COMPONENT_DIRS $ENV{IDF_PATH}/tools/unit-test-app/components)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(test_app)

components/eppp_link/test/test_app/README.md

@@ -0,0 +1,73 @@
+
+# Test application running both server and client on the same device
+
+Need to connect client's Tx to server's Rx and vice versa:
+GPIO25 - GPIO4
+GPIO26 - GPIO5
+
+We wait for the connection and then we start pinging the client's address on server's netif.
+
+## Example of output:
+
+```
+I (393) eppp_test_app: [APP] Startup..
+I (393) eppp_test_app: [APP] Free memory: 296332 bytes
+I (393) eppp_test_app: [APP] IDF version: v5.3-dev-1154-gf14d9e7431-dirty
+I (423) uart: ESP_INTR_FLAG_IRAM flag not set while CONFIG_UART_ISR_IN_IRAM is enabled, flag updated
+I (423) uart: queue free spaces: 16
+I (433) eppp_link: Waiting for IP address
+I (433) uart: ESP_INTR_FLAG_IRAM flag not set while CONFIG_UART_ISR_IN_IRAM is enabled, flag updated
+I (443) uart: queue free spaces: 16
+I (443) eppp_link: Waiting for IP address
+I (6473) esp-netif_lwip-ppp: Connected
+I (6513) eppp_link: Got IPv4 event: Interface "pppos_client" address: 192.168.11.2
+I (6523) esp-netif_lwip-ppp: Connected
+I (6513) eppp_link: Connected!
+I (6523) eppp_link: Got IPv4 event: Interface "pppos_server" address: 192.168.11.1
+I (6553) main_task: Returned from app_main()
+64bytes from 192.168.11.2 icmp_seq=1 ttl=255 time=18 ms
+64bytes from 192.168.11.2 icmp_seq=2 ttl=255 time=19 ms
+64bytes from 192.168.11.2 icmp_seq=3 ttl=255 time=19 ms
+64bytes from 192.168.11.2 icmp_seq=4 ttl=255 time=20 ms
+64bytes from 192.168.11.2 icmp_seq=5 ttl=255 time=19 ms
+64bytes from 192.168.11.2 icmp_seq=6 ttl=255 time=19 ms
+64bytes from 192.168.11.2 icmp_seq=7 ttl=255 time=19 ms
+From 192.168.11.2 icmp_seq=8 timeout        // <-- Disconnected Tx-Rx wires
+From 192.168.11.2 icmp_seq=9 timeout
+```
+## Test cases
+
+This test app exercises these methods of setting up server-client connection:
+* simple blocking API (eppp_listen() <--> eppp_connect()): Uses network events internally and waits for connection
+* simplified non-blocking API (eppp_open(EPPP_SERVER, ...) <--> eppp_open(EPPP_SERVER, ...) ): Uses events internally, optionally waits for connecting
+* manual API (eppp_init(), eppp_netif_start(), eppp_perform()): User to manually drive Rx task
+    - Note that the ping test for this test case takes longer, since we call perform for both server and client from one task, for example:
+
+```
+TEST(eppp_test, open_close_taskless)I (28562) uart: ESP_INTR_FLAG_IRAM flag not set while CONFIG_UART_ISR_IN_IRAM is enabled, flag updated
+I (28572) uart: ESP_INTR_FLAG_IRAM flag not set while CONFIG_UART_ISR_IN_IRAM is enabled, flag updated
+Note: esp_netif_init() has been called. Until next reset, TCP/IP task will periodicially allocate memory and consume CPU time.
+I (28602) uart: ESP_INTR_FLAG_IRAM flag not set while CONFIG_UART_ISR_IN_IRAM is enabled, flag updated
+I (28612) uart: queue free spaces: 16
+I (28612) uart: ESP_INTR_FLAG_IRAM flag not set while CONFIG_UART_ISR_IN_IRAM is enabled, flag updated
+I (28622) uart: queue free spaces: 16
+I (28642) esp-netif_lwip-ppp: Connected
+I (28642) esp-netif_lwip-ppp: Connected
+I (28642) test: Got IPv4 event: Interface "pppos_server(EPPP0)" address: 192.168.11.1
+I (28642) esp-netif_lwip-ppp: Connected
+I (28652) test: Got IPv4 event: Interface "pppos_client(EPPP1)" address: 192.168.11.2
+I (28662) esp-netif_lwip-ppp: Connected
+64bytes from 192.168.11.2 icmp_seq=1 ttl=255 time=93 ms
+64bytes from 192.168.11.2 icmp_seq=2 ttl=255 time=98 ms
+64bytes from 192.168.11.2 icmp_seq=3 ttl=255 time=99 ms
+64bytes from 192.168.11.2 icmp_seq=4 ttl=255 time=99 ms
+64bytes from 192.168.11.2 icmp_seq=5 ttl=255 time=99 ms
+5 packets transmitted, 5 received, time 488ms
+I (29162) esp-netif_lwip-ppp: User interrupt
+I (29162) test: Disconnected interface "pppos_client(EPPP1)"
+I (29172) esp-netif_lwip-ppp: User interrupt
+I (29172) test: Disconnected interface "pppos_server(EPPP0)"
+MALLOC_CAP_8BIT usage: Free memory delta: 0 Leak threshold: -64
+MALLOC_CAP_32BIT usage: Free memory delta: 0 Leak threshold: -64
+ PASS
+```

components/eppp_link/test/test_app/main/CMakeLists.txt

@@ -0,0 +1,4 @@
+idf_component_register(SRCS app_main.c
+                    INCLUDE_DIRS "."
+                    REQUIRES test_utils
+                    PRIV_REQUIRES unity nvs_flash esp_netif driver esp_event)

components/eppp_link/test/test_app/main/app_main.c

@@ -0,0 +1,344 @@
+/*
+ * SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stddef.h>
+#include "esp_system.h"
+#include "esp_event.h"
+#include "esp_netif.h"
+#include "esp_netif_ppp.h"
+#include "eppp_link.h"
+#include "lwip/sockets.h"
+#include "esp_log.h"
+#include "ping/ping_sock.h"
+#include "driver/uart.h"
+#include "test_utils.h"
+#include "unity.h"
+#include "test_utils.h"
+#include "unity_fixture.h"
+#include "memory_checks.h"
+#include "lwip/sys.h"
+
+#define CLIENT_INFO_CONNECTED   BIT0
+#define CLIENT_INFO_DISCONNECT  BIT1
+#define CLIENT_INFO_CLOSED      BIT2
+#define PING_SUCCEEDED          BIT3
+#define PING_FAILED             BIT4
+#define STOP_WORKER_TASK        BIT5
+#define WORKER_TASK_STOPPED     BIT6
+
+TEST_GROUP(eppp_test);
+TEST_SETUP(eppp_test)
+{
+    // Perform some open/close operations to disregard lazy init one-time allocations
+    // LWIP: core protection mutex
+    sys_arch_protect();
+    sys_arch_unprotect(0);
+    // UART: install and delete both drivers to disregard potential leak in allocated interrupt slot
+    TEST_ESP_OK(uart_driver_install(UART_NUM_1, 256, 0, 0, NULL, 0));
+    TEST_ESP_OK(uart_driver_delete(UART_NUM_1));
+    TEST_ESP_OK(uart_driver_install(UART_NUM_2, 256, 0, 0, NULL, 0));
+    TEST_ESP_OK(uart_driver_delete(UART_NUM_2));
+    // PING: used for timestamps
+    struct timeval time;
+    gettimeofday(&time, NULL);
+
+    test_utils_record_free_mem();
+    TEST_ESP_OK(test_utils_set_leak_level(0, ESP_LEAK_TYPE_CRITICAL, ESP_COMP_LEAK_GENERAL));
+}
+
+TEST_TEAR_DOWN(eppp_test)
+{
+    test_utils_finish_and_evaluate_leaks(32, 64);
+}
+
+static void test_on_ping_end(esp_ping_handle_t hdl, void *args)
+{
+    EventGroupHandle_t event = args;
+    uint32_t transmitted;
+    uint32_t received;
+    uint32_t total_time_ms;
+    esp_ping_get_profile(hdl, ESP_PING_PROF_REQUEST, &transmitted, sizeof(transmitted));
+    esp_ping_get_profile(hdl, ESP_PING_PROF_REPLY, &received, sizeof(received));
+    esp_ping_get_profile(hdl, ESP_PING_PROF_DURATION, &total_time_ms, sizeof(total_time_ms));
+    printf("%" PRId32 " packets transmitted, %" PRId32 " received, time %" PRId32 "ms\n", transmitted, received, total_time_ms);
+    if (transmitted == received) {
+        xEventGroupSetBits(event, PING_SUCCEEDED);
+    } else {
+        xEventGroupSetBits(event, PING_FAILED);
+    }
+}
+
+static void test_on_ping_success(esp_ping_handle_t hdl, void *args)
+{
+    uint8_t ttl;
+    uint16_t seqno;
+    uint32_t elapsed_time, recv_len;
+    ip_addr_t target_addr;
+    esp_ping_get_profile(hdl, ESP_PING_PROF_SEQNO, &seqno, sizeof(seqno));
+    esp_ping_get_profile(hdl, ESP_PING_PROF_TTL, &ttl, sizeof(ttl));
+    esp_ping_get_profile(hdl, ESP_PING_PROF_IPADDR, &target_addr, sizeof(target_addr));
+    esp_ping_get_profile(hdl, ESP_PING_PROF_SIZE, &recv_len, sizeof(recv_len));
+    esp_ping_get_profile(hdl, ESP_PING_PROF_TIMEGAP, &elapsed_time, sizeof(elapsed_time));
+    printf("%" PRId32 "bytes from %s icmp_seq=%d ttl=%d time=%" PRId32 " ms\n",
+           recv_len, inet_ntoa(target_addr.u_addr.ip4), seqno, ttl, elapsed_time);
+}
+
+struct client_info {
+    esp_netif_t *netif;
+    EventGroupHandle_t event;
+};
+
+static void open_client_task(void *ctx)
+{
+    struct client_info *info = ctx;
+    eppp_config_t config = EPPP_DEFAULT_CLIENT_CONFIG();
+    config.uart.port = UART_NUM_2;
+    config.uart.tx_io = 4;
+    config.uart.rx_io = 5;
+
+    info->netif = eppp_connect(&config);
+    xEventGroupSetBits(info->event, CLIENT_INFO_CONNECTED);
+
+    // wait for disconnection trigger
+    EventBits_t bits = xEventGroupWaitBits(info->event, CLIENT_INFO_DISCONNECT, pdFALSE, pdFALSE, pdMS_TO_TICKS(50000));
+    TEST_ASSERT_EQUAL(bits & CLIENT_INFO_DISCONNECT, CLIENT_INFO_DISCONNECT);
+    eppp_close(info->netif);
+    xEventGroupSetBits(info->event, CLIENT_INFO_CLOSED);
+    vTaskDelete(NULL);
+}
+
+TEST(eppp_test, init_deinit)
+{
+    // Init and deinit server size
+    eppp_config_t config = EPPP_DEFAULT_CONFIG(0, 0);
+    esp_netif_t *netif = eppp_init(EPPP_SERVER, &config);
+    TEST_ASSERT_NOT_NULL(netif);
+    eppp_deinit(netif);
+    netif = NULL;
+    // Init and deinit client size
+    netif = eppp_init(EPPP_CLIENT, &config);
+    TEST_ASSERT_NOT_NULL(netif);
+    eppp_deinit(netif);
+}
+
+static EventBits_t ping_test(uint32_t addr, esp_netif_t *netif, EventGroupHandle_t event)
+{
+    ip_addr_t target_addr = { .type = IPADDR_TYPE_V4, .u_addr.ip4.addr = addr };
+    esp_ping_config_t ping_config = ESP_PING_DEFAULT_CONFIG();
+    ping_config.interval_ms = 100;
+    ping_config.target_addr = target_addr;
+    ping_config.interface = esp_netif_get_netif_impl_index(netif);
+    esp_ping_callbacks_t cbs = { .cb_args = event, .on_ping_end = test_on_ping_end, .on_ping_success = test_on_ping_success };
+    esp_ping_handle_t ping;
+    esp_ping_new_session(&ping_config, &cbs, &ping);
+    esp_ping_start(ping);
+    // Wait for the client thread closure and delete locally created objects
+    EventBits_t bits = xEventGroupWaitBits(event, PING_SUCCEEDED | PING_FAILED, pdFALSE, pdFALSE, pdMS_TO_TICKS(50000));
+    TEST_ASSERT_EQUAL(bits & (PING_SUCCEEDED | PING_FAILED), PING_SUCCEEDED);
+    esp_ping_stop(ping);
+    esp_ping_delete_session(ping);
+    return bits;
+}
+
+TEST(eppp_test, open_close)
+{
+    test_case_uses_tcpip();
+
+    eppp_config_t config = EPPP_DEFAULT_SERVER_CONFIG();
+    struct client_info client = { .netif = NULL, .event =  xEventGroupCreate()};
+
+    TEST_ESP_OK(esp_event_loop_create_default());
+
+    TEST_ASSERT_NOT_NULL(client.event);
+
+    // Need to connect the client in a separate thread, as the simplified API blocks until connection
+    xTaskCreate(open_client_task, "client_task", 4096, &client, 5, NULL);
+
+    // Now start the server
+    esp_netif_t *eppp_server = eppp_listen(&config);
+
+    // Wait for the client to connect
+    EventBits_t bits = xEventGroupWaitBits(client.event, CLIENT_INFO_CONNECTED, pdFALSE, pdFALSE, pdMS_TO_TICKS(50000));
+    TEST_ASSERT_EQUAL(bits & CLIENT_INFO_CONNECTED, CLIENT_INFO_CONNECTED);
+
+    // Check that both server and client are valid netif pointers
+    TEST_ASSERT_NOT_NULL(eppp_server);
+    TEST_ASSERT_NOT_NULL(client.netif);
+
+    // Now that we're connected, let's try to ping clients address
+    bits = ping_test(config.ppp.their_ip4_addr.addr, eppp_server, client.event);
+    TEST_ASSERT_EQUAL(bits & (PING_SUCCEEDED | PING_FAILED), PING_SUCCEEDED);
+
+    // Trigger client disconnection and close the server
+    xEventGroupSetBits(client.event, CLIENT_INFO_DISCONNECT);
+    eppp_close(eppp_server);
+
+    // Wait for the client thread closure and delete locally created objects
+    bits = xEventGroupWaitBits(client.event, CLIENT_INFO_CLOSED, pdFALSE, pdFALSE, pdMS_TO_TICKS(50000));
+    TEST_ASSERT_EQUAL(bits & CLIENT_INFO_CLOSED, CLIENT_INFO_CLOSED);
+
+    TEST_ESP_OK(esp_event_loop_delete_default());
+    vEventGroupDelete(client.event);
+
+    // wait for the lwip sockets to close cleanly
+    vTaskDelay(pdMS_TO_TICKS(1000));
+}
+
+static void on_event(void *arg, esp_event_base_t base, int32_t event_id, void *data)
+{
+    EventGroupHandle_t event = arg;
+    if (base == IP_EVENT && event_id == IP_EVENT_PPP_GOT_IP) {
+        ip_event_got_ip_t *e = (ip_event_got_ip_t *)data;
+        esp_netif_t *netif = e->esp_netif;
+        ESP_LOGI("test", "Got IPv4 event: Interface \"%s(%s)\" address: " IPSTR, esp_netif_get_desc(netif),
+                 esp_netif_get_ifkey(netif), IP2STR(&e->ip_info.ip));
+        if (strcmp("pppos_server", esp_netif_get_desc(netif)) == 0) {
+            xEventGroupSetBits(event, 1 << EPPP_SERVER);
+        } else if (strcmp("pppos_client", esp_netif_get_desc(netif)) == 0) {
+            xEventGroupSetBits(event, 1 << EPPP_CLIENT);
+        }
+    } else if (base == NETIF_PPP_STATUS && event_id == NETIF_PPP_ERRORUSER) {
+        esp_netif_t **netif = data;
+        ESP_LOGI("test", "Disconnected interface \"%s(%s)\"", esp_netif_get_desc(*netif), esp_netif_get_ifkey(*netif));
+        if (strcmp("pppos_server", esp_netif_get_desc(*netif)) == 0) {
+            xEventGroupSetBits(event, 1 << EPPP_SERVER);
+        } else if (strcmp("pppos_client", esp_netif_get_desc(*netif)) == 0) {
+            xEventGroupSetBits(event, 1 << EPPP_CLIENT);
+        }
+    }
+}
+
+TEST(eppp_test, open_close_nonblocking)
+{
+    test_case_uses_tcpip();
+    EventGroupHandle_t event = xEventGroupCreate();
+
+    eppp_config_t server_config = EPPP_DEFAULT_SERVER_CONFIG();
+    TEST_ESP_OK(esp_event_loop_create_default());
+
+    // Open the server size
+    TEST_ESP_OK(esp_event_handler_register(IP_EVENT, ESP_EVENT_ANY_ID, on_event, event));
+    esp_netif_t *eppp_server = eppp_open(EPPP_SERVER, &server_config, 0);
+    TEST_ASSERT_NOT_NULL(eppp_server);
+    // Open the client size
+    eppp_config_t client_config = EPPP_DEFAULT_SERVER_CONFIG();
+    client_config.uart.port = UART_NUM_2;
+    client_config.uart.tx_io = 4;
+    client_config.uart.rx_io = 5;
+    esp_netif_t *eppp_client = eppp_open(EPPP_CLIENT, &client_config, 0);
+    TEST_ASSERT_NOT_NULL(eppp_client);
+    const EventBits_t wait_bits = (1 << EPPP_SERVER) | (1 << EPPP_CLIENT);
+    EventBits_t bits = xEventGroupWaitBits(event, wait_bits, pdTRUE, pdTRUE, pdMS_TO_TICKS(50000));
+    TEST_ASSERT_EQUAL(bits & wait_bits, wait_bits);
+
+    // Now that we're connected, let's try to ping clients address
+    bits = ping_test(server_config.ppp.their_ip4_addr.addr, eppp_server, event);
+    TEST_ASSERT_EQUAL(bits & (PING_SUCCEEDED | PING_FAILED), PING_SUCCEEDED);
+
+    // stop network for both client and server
+    eppp_netif_stop(eppp_client, 0); // ignore result, since we're not waiting for clean close
+    eppp_close(eppp_server);
+    eppp_close(eppp_client);         // finish client close
+    TEST_ESP_OK(esp_event_loop_delete_default());
+    vEventGroupDelete(event);
+
+    // wait for the lwip sockets to close cleanly
+    vTaskDelay(pdMS_TO_TICKS(1000));
+}
+
+
+struct worker {
+    esp_netif_t *eppp_server;
+    esp_netif_t *eppp_client;
+    EventGroupHandle_t event;
+};
+
+static void worker_task(void *ctx)
+{
+    struct worker *info = ctx;
+    while (1) {
+        eppp_perform(info->eppp_server);
+        eppp_perform(info->eppp_client);
+        if (xEventGroupGetBits(info->event) & STOP_WORKER_TASK) {
+            break;
+        }
+    }
+    xEventGroupSetBits(info->event, WORKER_TASK_STOPPED);
+    vTaskDelete(NULL);
+}
+
+TEST(eppp_test, open_close_taskless)
+{
+    test_case_uses_tcpip();
+    struct worker info = { .event = xEventGroupCreate() };
+
+    TEST_ESP_OK(esp_event_loop_create_default());
+    TEST_ESP_OK(esp_event_handler_register(IP_EVENT, ESP_EVENT_ANY_ID, on_event, info.event));
+    TEST_ESP_OK(esp_event_handler_register(NETIF_PPP_STATUS, ESP_EVENT_ANY_ID, on_event, info.event));
+
+    // Create server
+    eppp_config_t server_config = EPPP_DEFAULT_SERVER_CONFIG();
+    info.eppp_server = eppp_init(EPPP_SERVER, &server_config);
+    TEST_ASSERT_NOT_NULL(info.eppp_server);
+    // Create client
+    eppp_config_t client_config = EPPP_DEFAULT_CLIENT_CONFIG();
+    client_config.uart.port = UART_NUM_2;
+    client_config.uart.tx_io = 4;
+    client_config.uart.rx_io = 5;
+    info.eppp_client = eppp_init(EPPP_CLIENT, &client_config);
+    TEST_ASSERT_NOT_NULL(info.eppp_client);
+    // Start workers
+    xTaskCreate(worker_task, "worker", 4096, &info, 5, NULL);
+    // Start network
+    TEST_ESP_OK(eppp_netif_start(info.eppp_server));
+    TEST_ESP_OK(eppp_netif_start(info.eppp_client));
+
+    const EventBits_t wait_bits = (1 << EPPP_SERVER) | (1 << EPPP_CLIENT);
+    EventBits_t bits = xEventGroupWaitBits(info.event, wait_bits, pdTRUE, pdTRUE, pdMS_TO_TICKS(50000));
+    TEST_ASSERT_EQUAL(bits & wait_bits, wait_bits);
+    xEventGroupClearBits(info.event, wait_bits);
+
+    // Now that we're connected, let's try to ping clients address
+    bits = ping_test(server_config.ppp.their_ip4_addr.addr, info.eppp_server, info.event);
+    TEST_ASSERT_EQUAL(bits & (PING_SUCCEEDED | PING_FAILED), PING_SUCCEEDED);
+
+    // stop network for both client and server, we won't wait for completion so expecting ESP_FAIL
+    TEST_ASSERT_EQUAL(eppp_netif_stop(info.eppp_client, 0), ESP_FAIL);
+    TEST_ASSERT_EQUAL(eppp_netif_stop(info.eppp_server, 0), ESP_FAIL);
+    // and wait for completion
+    bits = xEventGroupWaitBits(info.event, wait_bits, pdTRUE, pdTRUE, pdMS_TO_TICKS(50000));
+    TEST_ASSERT_EQUAL(bits & wait_bits, wait_bits);
+
+    // now stop the worker
+    xEventGroupSetBits(info.event, STOP_WORKER_TASK);
+    bits = xEventGroupWaitBits(info.event, WORKER_TASK_STOPPED, pdTRUE, pdTRUE, pdMS_TO_TICKS(50000));
+    TEST_ASSERT_EQUAL(bits & WORKER_TASK_STOPPED, WORKER_TASK_STOPPED);
+
+    // and destroy objects
+    eppp_deinit(info.eppp_server);
+    eppp_deinit(info.eppp_client);
+    TEST_ESP_OK(esp_event_loop_delete_default());
+    vEventGroupDelete(info.event);
+
+    // wait for the lwip sockets to close cleanly
+    vTaskDelay(pdMS_TO_TICKS(1000));
+}
+
+
+TEST_GROUP_RUNNER(eppp_test)
+{
+    RUN_TEST_CASE(eppp_test, init_deinit)
+    RUN_TEST_CASE(eppp_test, open_close)
+    RUN_TEST_CASE(eppp_test, open_close_nonblocking)
+    RUN_TEST_CASE(eppp_test, open_close_taskless)
+}
+
+void app_main(void)
+{
+    UNITY_MAIN(eppp_test);
+}

components/eppp_link/test/test_app/main/idf_component.yml

@@ -0,0 +1,4 @@
+dependencies:
+  espressif/eppp_link:
+    version: "*"
+    override_path: "../../.."

components/eppp_link/test/test_app/sdkconfig.defaults

@@ -0,0 +1,9 @@
+CONFIG_IDF_TARGET="esp32"
+CONFIG_UART_ISR_IN_IRAM=y
+CONFIG_ESP_NETIF_IP_LOST_TIMER_INTERVAL=0
+CONFIG_FREERTOS_UNICORE=y
+CONFIG_LWIP_PPP_SUPPORT=y
+CONFIG_LWIP_PPP_SERVER_SUPPORT=y
+CONFIG_LWIP_PPP_VJ_HEADER_COMPRESSION=n
+CONFIG_LWIP_PPP_DEBUG_ON=y
+CONFIG_UNITY_ENABLE_FIXTURE=y

components/esp_modem/.cz.yaml

@@ -3,6 +3,6 @@ commitizen:
   bump_message: 'bump(modem): $current_version -> $new_version'
   pre_bump_hooks: python ../../ci/changelog.py esp_modem
   tag_format: modem-v$version
-  version: 1.0.4
+  version: 1.1.0
   version_files:
   - idf_component.yml

components/esp_modem/CHANGELOG.md

@@ -1,5 +1,52 @@
 # Changelog
 
+## [1.1.0](https://github.com/espressif/esp-protocols/commits/modem-v1.1.0)
+
+### Features
+
+- Added support for at_raw() command ([ae38110](https://github.com/espressif/esp-protocols/commit/ae38110), [#471](https://github.com/espressif/esp-protocols/issues/471))
+- Added iperf test for PPP netifs ([976e98d](https://github.com/espressif/esp-protocols/commit/976e98d))
+- Added test that performs OTA to exercise modem layers ([f2223dd](https://github.com/espressif/esp-protocols/commit/f2223dd))
+
+### Bug Fixes
+
+- Fixed OTA test to gracefully fail with no verification ([1dc4299](https://github.com/espressif/esp-protocols/commit/1dc4299))
+- Added C-API to configure APN ([ce7dadd](https://github.com/espressif/esp-protocols/commit/ce7dadd), [#485](https://github.com/espressif/esp-protocols/issues/485))
+- Fixed AT commands to copy strings to prevent overrides ([741d166](https://github.com/espressif/esp-protocols/commit/741d166), [#463](https://github.com/espressif/esp-protocols/issues/463))
+- Fixed incorrect dial command format ([0998f3d](https://github.com/espressif/esp-protocols/commit/0998f3d), [#433](https://github.com/espressif/esp-protocols/issues/433))
+- Fixed documentation and example on creating custom device ([577de67](https://github.com/espressif/esp-protocols/commit/577de67), [#452](https://github.com/espressif/esp-protocols/issues/452))
+- Removed CI jobs for IDF v4.2 ([d88cd61](https://github.com/espressif/esp-protocols/commit/d88cd61))
+- Fixed OAT test to verify server cert and CN ([edc3e72](https://github.com/espressif/esp-protocols/commit/edc3e72))
+- Fixed set_pdp_context() command timeout ([1d80cbc](https://github.com/espressif/esp-protocols/commit/1d80cbc), [#455](https://github.com/espressif/esp-protocols/issues/455))
+
+### Updated
+
+- docs(modem): Added description of manual test procedure ([68ce794](https://github.com/espressif/esp-protocols/commit/68ce794))
+
+## [1.0.5](https://github.com/espressif/esp-protocols/commits/modem-v1.0.5)
+
+### Major changes
+
+- Added support for implementing user defined modules in standard C-API ([Support for custom modules with C-API](https://github.com/espressif/esp-protocols/commit/0254d50))
+
+### Bug Fixes
+
+- Added test injecting unexpected replies ([b220d1e](https://github.com/espressif/esp-protocols/commit/b220d1e), [#426](https://github.com/espressif/esp-protocols/issues/426))
+- Fixed inconsistent state on data after OK ([bf99f28](https://github.com/espressif/esp-protocols/commit/bf99f28), [#426](https://github.com/espressif/esp-protocols/issues/426))
+- TLS example: Added restore session support in mbedtls-wrap ([79d38e5](https://github.com/espressif/esp-protocols/commit/79d38e5))
+- Fixed examples to show netif on ppp-changed event ([a70b197](https://github.com/espressif/esp-protocols/commit/a70b197))
+- remove unused GNU Make based buildsystem files ([d6b6f63](https://github.com/espressif/esp-protocols/commit/d6b6f63))
+- specify override_path in example manifest files ([5b78da4](https://github.com/espressif/esp-protocols/commit/5b78da4))
+- Added test-cases that exercise mode transitions ([aff571d](https://github.com/espressif/esp-protocols/commit/aff571d))
+- Fixed mode transitions between any state and UNDEF ([93cb2ca](https://github.com/espressif/esp-protocols/commit/93cb2ca), [#320](https://github.com/espressif/esp-protocols/issues/320))
+- Fixed API docs within doxygen comments ([020b407](https://github.com/espressif/esp-protocols/commit/020b407))
+- Support for custom modules with C-API ([0254d50](https://github.com/espressif/esp-protocols/commit/0254d50))
+- Fix CRLF issue with esp_modem_c_api.cpp ([2661b4d](https://github.com/espressif/esp-protocols/commit/2661b4d))
+
+### Updated
+
+- ci(common): Created reusable action for host and coverage tests ([9ad04de](https://github.com/espressif/esp-protocols/commit/9ad04de))
+
 ## [1.0.4](https://github.com/espressif/esp-protocols/commits/modem-v1.0.4)
 
 ### Bug Fixes

components/esp_modem/examples/modem_console/main/my_module_dce.hpp

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2022-2024 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Unlicense OR CC0-1.0
  */
@@ -17,26 +17,20 @@
 #include "cxx_include/esp_modem_dce_module.hpp"
 
 /**
- * @brief Definition of a custom modem which inherits from the GenericModule, uses all its methods
- * and could override any of them. Here, for demonstration purposes only, we redefine just `get_module_name()`
+ * @brief Definition of a custom DCE uses GenericModule and all its methods
+ * but could override command processing. Here, for demonstration purposes only,
+ * we "inject" URC handler to the actual command processing.
+ * This is possible since we inherit from `CommandableIf` and redefine `command()` method.
+ * Then we're able to use declare all common methods from the command library
+ * to be processed using "our" `command()` method (with custom URC handler).
  */
-class MyShinyModem: public esp_modem::GenericModule {
-    using GenericModule::GenericModule;
-public:
-    esp_modem::command_result get_module_name(std::string &name) override
-    {
-        name = "Custom Shiny Module";
-        return esp_modem::command_result::OK;
-    }
-};
-
 namespace Shiny {
 
 using namespace esp_modem;
 
-class DCE : public esp_modem::DCE_T<MyShinyModem>, public CommandableIf {
+class DCE : public esp_modem::DCE_T<GenericModule>, public CommandableIf {
 public:
-    using DCE_T<MyShinyModem>::DCE_T;
+    using DCE_T<GenericModule>::DCE_T;
 
     command_result
     command(const std::string &cmd, got_line_cb got_line, uint32_t time_ms) override
@@ -97,7 +91,7 @@ public:
                                        std::shared_ptr<esp_modem::DTE> dte,
                                        esp_netif_t *netif)
     {
-        return build_generic_DCE<MyShinyModem, DCE, std::unique_ptr<DCE>>(config, std::move(dte), netif);
+        return build_generic_DCE<GenericModule, DCE, std::unique_ptr<DCE>>(config, std::move(dte), netif);
     }
 
 };

components/esp_modem/examples/modem_tcp_client/components/extra_tcp_transports/include/mbedtls_wrap.hpp

@@ -29,6 +29,7 @@ public:
     int read(unsigned char *buf, size_t len);
     [[nodiscard]] bool set_own_cert(const_buf crt, const_buf key);
     [[nodiscard]] bool set_ca_cert(const_buf crt);
+    bool set_hostname(const char *name);
     virtual int send(const unsigned char *buf, size_t len) = 0;
     virtual int recv(unsigned char *buf, size_t len) = 0;
     size_t get_available_bytes();

components/esp_modem/examples/modem_tcp_client/components/extra_tcp_transports/mbedtls_wrap.cpp

@@ -116,6 +116,16 @@ bool Tls::set_ca_cert(const_buf crt)
     return true;
 }
 
+bool Tls::set_hostname(const char *name)
+{
+    int ret = mbedtls_ssl_set_hostname(&ssl_, name);
+    if (ret < 0) {
+        print_error("mbedtls_ssl_set_hostname", ret);
+        return false;
+    }
+    return true;
+}
+
 Tls::Tls()
 {
     mbedtls_x509_crt_init(&public_cert_);

components/esp_modem/idf_component.yml

@@ -1,4 +1,4 @@
-version: "1.0.4"
+version: "1.1.0"
 description: Library for communicating with cellular modems in command and data modes
 url: https://github.com/espressif/esp-protocols/tree/master/components/esp_modem
 issues: https://github.com/espressif/esp-protocols/issues

components/esp_modem/include/cxx_include/esp_modem_command_library.hpp

@@ -54,7 +54,8 @@ command_result power_down_sim76xx(CommandableIf *t);
 command_result power_down_sim70xx(CommandableIf *t);
 command_result set_network_bands_sim76xx(CommandableIf *t, const std::string &mode, const int *bands, int size);
 command_result power_down_sim8xx(CommandableIf *t);
-command_result set_data_mode_sim8xx(CommandableIf *t);
+command_result set_data_mode_alt(CommandableIf *t);
+command_result set_pdp_context(CommandableIf *t, PdpContext &pdp, uint32_t timeout_ms);
 
 /**
  * @}

components/esp_modem/include/cxx_include/esp_modem_command_library_utils.hpp

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2021-2024 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -25,18 +25,16 @@ command_result generic_command(CommandableIf *t, const std::string &command,
  * @brief Utility command to send command and return reply (after DCE says OK)
  * @param t Anything that is "command-able"
  * @param command Command to issue
- * @param output String to return
- * @param timeout_ms
+ * @param output String to return (could be either std::string& or std::string_view&)
  * @param timeout_ms Command timeout in ms
  * @return Generic command return type (OK, FAIL, TIMEOUT)
  */
-command_result generic_get_string(CommandableIf *t, const std::string &command, std::string &output, uint32_t timeout_ms = 500);
+template <typename T> command_result generic_get_string(CommandableIf *t, const std::string &command, T &output, uint32_t timeout_ms = 500);
 
 /**
  * @brief Generic command that passes on "OK" and fails on "ERROR"
  * @param t Anything that is "command-able"
  * @param command Command to issue
- * @param timeout
  * @param timeout_ms Command timeout in ms
  * @return Generic command return type (OK, FAIL, TIMEOUT)
  */

components/esp_modem/include/cxx_include/esp_modem_dce_module.hpp

@@ -144,6 +144,8 @@ class SIM7070: public GenericModule {
     using GenericModule::GenericModule;
 public:
     command_result power_down() override;
+    command_result set_data_mode() override;
+
 };
 
 /**
@@ -162,7 +164,6 @@ class SIM800: public GenericModule {
     using GenericModule::GenericModule;
 public:
     command_result power_down() override;
-    command_result set_data_mode() override;
 };
 
 /**
@@ -170,6 +171,8 @@ public:
  */
 class BG96: public GenericModule {
     using GenericModule::GenericModule;
+public:
+    command_result set_pdp_context(PdpContext &pdp) override;
 };
 
 /**

components/esp_modem/include/esp_modem_c_api_types.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2021-2024 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -119,8 +119,27 @@ esp_err_t esp_modem_set_error_cb(esp_modem_dce_t *dce, esp_modem_terminal_error_
  */
 esp_err_t esp_modem_set_mode(esp_modem_dce_t *dce, esp_modem_dce_mode_t mode);
 
+/**
+ * @brief Convenient function to run arbitrary commands from C-API
+ *
+ * @param dce Modem DCE handle
+ * @param command Command to send
+ * @param got_line_cb Callback function which is called whenever we receive a line
+ * @param timeout_ms Command timeout
+ * @return ESP_OK on success, ESP_FAIL on failure
+ */
+
 esp_err_t esp_modem_command(esp_modem_dce_t *dce, const char *command, esp_err_t(*got_line_cb)(uint8_t *data, size_t len), uint32_t timeout_ms);
 
+/**
+ * @brief Sets the APN and configures it into the modem's PDP context
+ *
+ * @param dce Modem DCE handle
+ * @param apn Access Point Name
+ * @return ESP_OK on success
+ */
+esp_err_t esp_modem_set_apn(esp_modem_dce_t *dce, const char *apn);
+
 /**
  * @}
  */

components/esp_modem/include/generate/esp_modem_command_declare.inc

@@ -44,6 +44,18 @@ ESP_MODEM_DECLARE_DCE_COMMAND(store_profile, command_result, 0) \
  */\
 ESP_MODEM_DECLARE_DCE_COMMAND(set_pin, command_result, 1, STRING_IN(p1, pin)) \
     \
+/**
+ * @brief Execute the supplied AT command in raw mode (doesn't append '\r' to command, returns everything)
+ * @param[in] cmd String command that's send to DTE
+ * @param[out] out Raw output from DTE
+ * @param[in] pass Pattern in response for the API to return OK
+ * @param[in] fail Pattern in response for the API to return FAIL
+ * @param[in] cmd String command that's send to DTE
+ * @param[in] timeout AT command timeout in milliseconds
+ * @return OK, FAIL or TIMEOUT
+ */\
+ESP_MODEM_DECLARE_DCE_COMMAND(at_raw, command_result, 5, STRING_IN(p1, cmd), STRING_OUT(p2, out), STRING_IN(p3, pass), STRING_IN(p4, fail), INT_IN(p5, timeout)) \
+    \
 /**
  * @brief Execute the supplied AT command
  * @param[in] cmd AT command

components/esp_modem/include/vfs_resource/vfs_create.hpp

@@ -31,7 +31,7 @@
  */
 struct esp_modem_vfs_uart_creator {
     const char *dev_name;                       /*!< VFS device name, e.g. /dev/uart/n */
-    const struct esp_modem_uart_term_config uart;     /*!< UART driver init struct */
+    struct esp_modem_uart_term_config uart;     /*!< UART driver init struct */
 };
 
 /**

components/esp_modem/src/esp_modem_c_api.cpp

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2021-2023 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2021-2024 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -17,7 +17,7 @@
 #include "esp_private/c_api_wrapper.hpp"
 
 #ifndef ESP_MODEM_C_API_STR_MAX
-#define ESP_MODEM_C_API_STR_MAX 64
+#define ESP_MODEM_C_API_STR_MAX 128
 #endif
 
 #ifndef HAVE_STRLCPY
@@ -206,6 +206,20 @@ extern "C" esp_err_t esp_modem_get_imsi(esp_modem_dce_t *dce_wrap, char *p_imsi)
     return ret;
 }
 
+extern "C" esp_err_t esp_modem_at_raw(esp_modem_dce_t *dce_wrap, const char *cmd, char *p_out, const char *pass, const char *fail, int timeout)
+{
+    if (dce_wrap == nullptr || dce_wrap->dce == nullptr) {
+        return ESP_ERR_INVALID_ARG;
+    }
+    std::string out;
+    auto ret = command_response_to_esp_err(dce_wrap->dce->at_raw(cmd, out, pass, fail, timeout));
+    if ((p_out != NULL) && (!out.empty())) {
+        strlcpy(p_out, out.c_str(), ESP_MODEM_C_API_STR_MAX);
+    }
+    return ret;
+}
+
+
 extern "C" esp_err_t esp_modem_set_flow_control(esp_modem_dce_t *dce_wrap, int dce_flow, int dte_flow)
 {
     if (dce_wrap == nullptr || dce_wrap->dce == nullptr) {
@@ -434,3 +448,10 @@ extern "C" esp_err_t esp_modem_set_baud(esp_modem_dce_t *dce_wrap, int baud)
 {
     return command_response_to_esp_err(dce_wrap->dce->set_baud(baud));
 }
+
+extern "C" esp_err_t esp_modem_set_apn(esp_modem_dce_t *dce_wrap, const char *apn)
+{
+    auto new_pdp = std::unique_ptr<PdpContext>(new PdpContext(apn));
+    dce_wrap->dce->get_module()->configure_pdp_context(std::move(new_pdp));
+    return ESP_OK;
+}

components/esp_modem/src/esp_modem_command_library.cpp

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2021-2024 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -51,7 +51,35 @@ command_result generic_command(CommandableIf *t, const std::string &command,
     return generic_command(t, command, pass, fail, timeout_ms);
 }
 
-static command_result generic_get_string(CommandableIf *t, const std::string &command, std::string_view &output, uint32_t timeout_ms = 500)
+/*
+ * Purpose of this namespace is to provide different means of assigning the result to a string-like parameter.
+ * By default we assign strings, which comes with an allocation. Alternatively we could take `std::span`
+ * with user's buffer and directly copy the result, thus avoiding allocations (this is not used as of now)
+ */
+namespace str_copy {
+
+bool set(std::string &dest, std::string_view &src)
+{
+    dest = src;
+    return true;
+}
+
+/* This is an example of using std::span output in generic_get_string()
+bool set(std::span<char> &dest, std::string_view &src)
+{
+    if (dest.size() >= src.size()) {
+        std::copy(src.begin(), src.end(), dest.data());
+        dest = dest.subspan(0, src.size());
+        return true;
+    }
+    ESP_LOGE(TAG, "Cannot set result of size %d (to span of size %d)", dest.size(), src.size());
+    return false;
+}
+*/
+
+} // str_copy
+
+template <typename T> command_result generic_get_string(CommandableIf *t, const std::string &command, T &output, uint32_t timeout_ms)
 {
     ESP_LOGV(TAG, "%s", __func__ );
     return t->command(command, [&](uint8_t *data, size_t len) {
@@ -70,7 +98,9 @@ static command_result generic_get_string(CommandableIf *t, const std::string &co
             } else if (token.find("ERROR") != std::string::npos) {
                 return command_result::FAIL;
             } else if (token.size() > 2) {
-                output = token;
+                if (!str_copy::set(output, token)) {
+                    return command_result::FAIL;
+                }
             }
             response = response.substr(pos + 1);
         }
@@ -78,18 +108,6 @@ static command_result generic_get_string(CommandableIf *t, const std::string &co
     }, timeout_ms);
 }
 
-command_result generic_get_string(CommandableIf *t, const std::string &command, std::string &output, uint32_t timeout_ms)
-{
-    ESP_LOGV(TAG, "%s", __func__ );
-    std::string_view out;
-    auto ret = generic_get_string(t, command, out, timeout_ms);
-    if (ret == command_result::OK) {
-        output = out;
-    }
-    return ret;
-}
-
-
 command_result generic_command_common(CommandableIf *t, const std::string &command, uint32_t timeout_ms)
 {
     ESP_LOGV(TAG, "%s", __func__ );
@@ -153,7 +171,7 @@ command_result hang_up(CommandableIf *t)
 command_result get_battery_status(CommandableIf *t, int &voltage, int &bcs, int &bcl)
 {
     ESP_LOGV(TAG, "%s", __func__ );
-    std::string_view out;
+    std::string out;
     auto ret = generic_get_string(t, "AT+CBC\r", out);
     if (ret != command_result::OK) {
         return ret;
@@ -189,7 +207,7 @@ command_result get_battery_status(CommandableIf *t, int &voltage, int &bcs, int
 command_result get_battery_status_sim7xxx(CommandableIf *t, int &voltage, int &bcs, int &bcl)
 {
     ESP_LOGV(TAG, "%s", __func__ );
-    std::string_view out;
+    std::string out;
     auto ret = generic_get_string(t, "AT+CBC\r", out);
     if (ret != command_result::OK) {
         return ret;
@@ -224,7 +242,7 @@ command_result set_flow_control(CommandableIf *t, int dce_flow, int dte_flow)
 command_result get_operator_name(CommandableIf *t, std::string &operator_name, int &act)
 {
     ESP_LOGV(TAG, "%s", __func__ );
-    std::string_view out;
+    std::string out;
     auto ret = generic_get_string(t, "AT+COPS?\r", out, 75000);
     if (ret != command_result::OK) {
         return ret;
@@ -261,24 +279,29 @@ command_result set_echo(CommandableIf *t, bool on)
     return generic_command_common(t, "ATE0\r");
 }
 
-command_result set_pdp_context(CommandableIf *t, PdpContext &pdp)
+command_result set_pdp_context(CommandableIf *t, PdpContext &pdp, uint32_t timeout_ms)
 {
     ESP_LOGV(TAG, "%s", __func__ );
     std::string pdp_command = "AT+CGDCONT=" + std::to_string(pdp.context_id) +
                               ",\"" + pdp.protocol_type + "\",\"" + pdp.apn + "\"\r";
-    return generic_command_common(t, pdp_command, 150000);
+    return generic_command_common(t, pdp_command, timeout_ms);
+}
+
+command_result set_pdp_context(CommandableIf *t, PdpContext &pdp)
+{
+    return set_pdp_context(t, pdp, 1000);
 }
 
 command_result set_data_mode(CommandableIf *t)
 {
     ESP_LOGV(TAG, "%s", __func__ );
-    return generic_command(t, "ATD*99##\r", "CONNECT", "ERROR", 5000);
+    return generic_command(t, "ATD*99#\r", "CONNECT", "ERROR", 5000);
 }
 
-command_result set_data_mode_sim8xx(CommandableIf *t)
+command_result set_data_mode_alt(CommandableIf *t)
 {
     ESP_LOGV(TAG, "%s", __func__ );
-    return generic_command(t, "ATD*99#\r", "CONNECT", "ERROR", 5000);
+    return generic_command(t, "ATD*99##\r", "CONNECT", "ERROR", 5000);
 }
 
 command_result resume_data_mode(CommandableIf *t)
@@ -356,7 +379,7 @@ command_result set_cmux(CommandableIf *t)
 command_result read_pin(CommandableIf *t, bool &pin_ok)
 {
     ESP_LOGV(TAG, "%s", __func__ );
-    std::string_view out;
+    std::string out;
     auto ret = generic_get_string(t, "AT+CPIN?\r", out);
     if (ret != command_result::OK) {
         return ret;
@@ -389,10 +412,26 @@ command_result at(CommandableIf *t, const std::string &cmd, std::string &out, in
     return generic_get_string(t, at_command, out, timeout);
 }
 
+command_result at_raw(CommandableIf *t, const std::string &cmd, std::string &out, const std::string &pass, const std::string &fail, int timeout = 500)
+{
+    ESP_LOGV(TAG, "%s", __func__ );
+    return t->command(cmd, [&](uint8_t *data, size_t len) {
+        out.assign(reinterpret_cast<char *>(data), len);
+
+        if (out.find(pass) != std::string::npos) {
+            return command_result::OK;
+        } else if (out.find(fail) != std::string::npos) {
+            return command_result::FAIL;
+        }
+
+        return command_result::TIMEOUT;
+    }, timeout);
+}
+
 command_result get_signal_quality(CommandableIf *t, int &rssi, int &ber)
 {
     ESP_LOGV(TAG, "%s", __func__ );
-    std::string_view out;
+    std::string out;
     auto ret = generic_get_string(t, "AT+CSQ\r", out);
     if (ret != command_result::OK) {
         return ret;
@@ -430,7 +469,7 @@ command_result set_network_attachment_state(CommandableIf *t, int state)
 command_result get_network_attachment_state(CommandableIf *t, int &state)
 {
     ESP_LOGV(TAG, "%s", __func__ );
-    std::string_view out;
+    std::string out;
     auto ret = generic_get_string(t, "AT+CGATT?\r", out);
     if (ret != command_result::OK) {
         return ret;
@@ -457,7 +496,7 @@ command_result set_radio_state(CommandableIf *t, int state)
 command_result get_radio_state(CommandableIf *t, int &state)
 {
     ESP_LOGV(TAG, "%s", __func__ );
-    std::string_view out;
+    std::string out;
     auto ret = generic_get_string(t, "AT+CFUN?\r", out);
     if (ret != command_result::OK) {
         return ret;
@@ -522,7 +561,7 @@ command_result set_network_bands_sim76xx(CommandableIf *t, const std::string &mo
 command_result get_network_system_mode(CommandableIf *t, int &mode)
 {
     ESP_LOGV(TAG, "%s", __func__ );
-    std::string_view out;
+    std::string out;
     auto ret = generic_get_string(t, "AT+CNSMOD?\r", out);
     if (ret != command_result::OK) {
         return ret;
@@ -550,7 +589,7 @@ command_result set_gnss_power_mode(CommandableIf *t, int mode)
 command_result get_gnss_power_mode(CommandableIf *t, int &mode)
 {
     ESP_LOGV(TAG, "%s", __func__ );
-    std::string_view out;
+    std::string out;
     auto ret = generic_get_string(t, "AT+CGNSPWR?\r", out);
     if (ret != command_result::OK) {
         return ret;

components/esp_modem/src/esp_modem_dte.cpp

@@ -347,6 +347,9 @@ void DTE::on_read(got_line_cb on_read_cb)
 
 bool DTE::command_cb::process_line(uint8_t *data, size_t consumed, size_t len)
 {
+    if (result != command_result::TIMEOUT) {
+        return false;   // this line has been processed already (got OK or FAIL previously)
+    }
     if (memchr(data + consumed, separator, len)) {
         result = got_line(data, consumed + len);
         if (result == command_result::OK || result == command_result::FAIL) {

components/esp_modem/src/esp_modem_modules.cpp

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2021-2024 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -67,6 +67,11 @@ command_result SIM7070::power_down()
     return dce_commands::power_down_sim70xx(dte.get());
 }
 
+command_result SIM7070::set_data_mode()
+{
+    return dce_commands::set_data_mode_alt(dte.get());
+}
+
 command_result SIM7000::power_down()
 {
     return dce_commands::power_down_sim70xx(dte.get());
@@ -77,9 +82,9 @@ command_result SIM800::power_down()
     return dce_commands::power_down_sim8xx(dte.get());
 }
 
-command_result SIM800::set_data_mode()
+command_result BG96::set_pdp_context(esp_modem::PdpContext &pdp)
 {
-    return dce_commands::set_data_mode_sim8xx(dte.get());
+    return dce_commands::set_pdp_context(dte.get(), pdp, 300);
 }
 
 }

components/esp_modem/test/README.md

@@ -0,0 +1,47 @@
+# ESP-Modem Testing
+
+This folder contains automated and manual tests for esp-modem component. Beside these tests, some jobs are executed in CI to exercise standard examples (please refer to the CI definition and CI related sdkconfigs in examples).
+
+List of test projects:
+
+* `host_test` -- esp_modem is build on host (linux), modem's terminal in mocked using Loobpack class which creates simple responders to AT and CMUX mode. This test is executed in CI.
+* `target`  -- test executed on target with no modem device, just a pppd running on the test runner. This test is executed in CI.
+* `target_ota` -- Manual test which perform OTA over PPP.
+* `target_iperf` -- Manual test to measure data throughput via PPP.
+
+## Manual testing
+
+Prior to every `esp_modem` release, these manual tests must be executed and pass
+(IDF-9074 to move the manual tests to CI)
+
+### `target_ota`
+
+Make sure that the UART ISR is not in IRAM, so the error messages are expected in the log, but the ESP32 should recover and continue with downloading the image.
+
+Perform the test for these devices
+* SIM7600 (CMUX mode)
+* BG96 (CMUX mode)
+* SIM7000 (PPP mode)
+* A7672 (CMUX mode -- the only device with 2 byte CMUX payload), so the test is expected to fail more often if (`CONFIG_ESP_MODEM_CMUX_DEFRAGMENT_PAYLOAD=y` && `CONFIG_ESP_MODEM_USE_INFLATABLE_BUFFER_IF_NEEDED=n` && dte_buffer < device max payload)
+* NetworkDCE -- no modem device, pppd (PPP mode)
+
+Perform the test with these configurations:
+* CONFIG_TEST_USE_VFS_TERM (y/n)
+* CONFIG_ESP_HTTP_CLIENT_ENABLE_CUSTOM_TRANSPORT (y/n)
+* CONFIG_ESP_MODEM_CMUX_DEFRAGMENT_PAYLOAD (y/n)
+* CONFIG_ESP_MODEM_USE_INFLATABLE_BUFFER_IF_NEEDED (y/n)
+
+**Criteria for passing the test**
+
+The test should complete the download with maximum 1 retry (50% of OTA failure)
+In case of CMUX mode, we're trying to exit CMUX at the end of the test. This step might also fail for some devices, as the CMUX-exit is not supported on certain devices (when the final error message appears that the device failed to exit CMUX, we just verify the new image by reseting the ESP32)
+
+### `target_iperf`
+
+Run these 4 `iperf` configurations (either manually or using `pytest`):
+* tcp_tx_throughput
+* tcp_rx_throughput
+* udp_tx_throughput
+* udp_rx_throughput
+
+And verify in all four cases the value is about 0.70 Mbps

components/esp_modem/test/host_test/main/LoopbackTerm.cpp

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2022-2024 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Unlicense OR CC0-1.0
  */
@@ -36,7 +36,7 @@ int LoopbackTerm::write(uint8_t *data, size_t len)
         } else if (command == "ATO\r") {
             response = "ERROR\r\n";
         } else if (command.find("ATD") != std::string::npos) {
-            response = "CONNECT\r\n";
+            response = "CONNECT\n";
         } else if (command.find("AT+CSQ\r") != std::string::npos) {
             response = "+CSQ: 123,456\n\r\nOK\r\n";
         } else if (command.find("AT+CGMM\r") != std::string::npos) {
@@ -74,6 +74,9 @@ int LoopbackTerm::write(uint8_t *data, size_t len)
     }
     if (len > 2 && data[0] == 0xf9) { // Simple CMUX responder
         // turn the request into a reply -> implements CMUX loopback
+        // Note: This simple CMUX responder only updates CMUX headers and replaces payload.
+        // It means that all responses (that we test) must be shorter or equal to the requests
+        // For example ATD (dial command): sizeof("ATD*99#") >= sizeof("CONNECT");
         if (data[2] == 0x3f || data[2] == 0x53) {  // SABM command
             data[2] = 0x73;
         } else if (data[2] == 0xef) { // Generic request

components/esp_modem/test/host_test/main/test_modem.cpp

@@ -33,6 +33,20 @@ TEST_CASE("DTE command races", "[esp_modem]")
         // this command should either timeout or finish successfully
         CHECK((ret == command_result::TIMEOUT || ret == command_result::OK));
     }
+
+    // Now we test the same, but with some garbage after the expected data and inject the reply in chunks by 3 bytes
+    uint8_t resp2[] = {'O', 'K', '\n', '1', '2', '\n'};
+    for (int i = 0; i < 1000; ++i) {
+        loopback->inject(&resp2[0], sizeof(resp2), 3, /* 1ms before injecting reply */0, 0);
+        auto ret = dce->command("check\n", [&](uint8_t *data, size_t len) {
+            if (len > 0 && data[0] == 'O') { // expected reply only when it starts with '0'
+                return command_result::OK;
+            }
+            return esp_modem::command_result::TIMEOUT;
+        }, 1);
+        // this command should either timeout or finish successfully
+        CHECK((ret == command_result::TIMEOUT || ret == command_result::OK));
+    }
 }
 
 TEST_CASE("Test polymorphic delete for custom device/dte", "[esp_modem]")

components/esp_modem/test/target_iperf/CMakeLists.txt

@@ -0,0 +1,10 @@
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+set(EXTRA_COMPONENT_DIRS    $ENV{IDF_PATH}/examples/system/console/advanced/components
+                            $ENV{IDF_PATH}/examples/common_components/iperf
+                            "../..")
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(pppd_test)

components/esp_modem/test/target_iperf/README.md

@@ -0,0 +1,48 @@
+# Target test for measuring TCP/UDP network performance
+
+## Overview
+
+The aim of this test is to run `iperf` application to measure network throughput of the esp_modem library.
+
+### Configure PPP server
+
+This test uses a network DCE device, which only needs a PPP server. To run the PPP server, use this command:
+```
+sudo pppd /dev/ttyUSB1 115200 192.168.11.1:192.168.11.2 ms-dns 8.8.8.8 modem local noauth debug nocrtscts nodetach +ipv6
+```
+
+### Running using pytest
+
+For checking the performance, you only need to execute the pytest, which will measure the network throughput automatically and report the resultant values. For running the pytest, you need to:
+* install IDF pytest packages by running: `./install.sh --enable-pytest`
+* add IDF internal packages to python path: `export PYTHONPATH=${DIF_PATH}/tools/ci/python_packages/`
+* run the pytest as **superuser**
+
+It's useful to note that when running the test multiple times, you can use `pytest --skip-autoflash y` so the pytest wouldn't have to always reprogram the DUT.
+
+### Performance summary
+
+Here's an example of the resultant summary logged by the pytest
+```
+2023-11-29 18:28:25 INFO [Performance][tcp_tx_throughput]: 0.75 Mbps
+2023-11-29 18:28:25 INFO [Performance][tcp_rx_throughput]: 0.70 Mbps
+2023-11-29 18:28:25 INFO [Performance][udp_tx_throughput]: 0.73 Mbps
+2023-11-29 18:28:25 INFO [Performance][udp_rx_throughput]: 0.70 Mbps
+```
+
+### Running the iperf manually
+
+Execute `idf.py flash monitor` in one terminal and after connecting to the PPP server (after getting an IP address), you can use standard `iperf` commands.
+In another terminal, you need to execute the iperf counterpart.
+For example running for checking UDP performance, and running server on ESP32, please run:
+* iperf -u -s -i 3 (in ESP32 terminal)
+* iperf -u -c SERVER_IP -t 60 -i 3 (on the host side)
+
+Note that command `pppd info` will print actual IP addresses:
+```
+iperf> pppd info
+ppp:
+  IP: 192.168.11.2
+  MASK: 255.255.255.255
+  GW: 192.168.11.3
+```

components/esp_modem/test/target_iperf/main/CMakeLists.txt

@@ -0,0 +1,3 @@
+idf_component_register(SRCS "NetworkDCE.cpp"
+                            "cmd_pppclient.c"
+                            "pppd_iperf_main.c")

components/esp_modem/test/target_iperf/main/NetworkDCE.cpp

@@ -0,0 +1,96 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+#include "cxx_include/esp_modem_dte.hpp"
+#include "esp_modem_config.h"
+#include "cxx_include/esp_modem_api.hpp"
+#include "cxx_include/esp_modem_dce_factory.hpp"
+#include <memory>
+#include <utility>
+
+using namespace esp_modem;
+using namespace esp_modem::dce_factory;
+
+class NetModule;
+typedef DCE_T<NetModule> NetDCE;
+
+/**
+ * @brief Custom factory which can build and create a DCE using a custom module
+ */
+class NetDCE_Factory: public Factory {
+public:
+    template <typename T, typename ...Args>
+    static DCE_T<T> *create(const config *cfg, Args &&... args)
+    {
+        return build_generic_DCE<T>(cfg, std::forward<Args>(args)...);
+    }
+};
+
+/**
+ * @brief This is a null-module, doesn't define any AT commands, just passes everything to pppd
+ */
+class NetModule: public ModuleIf {
+public:
+    explicit NetModule(std::shared_ptr<DTE> dte, const esp_modem_dce_config *cfg):
+        dte(std::move(dte)) {}
+
+    bool setup_data_mode() override
+    {
+        return true;
+    }
+
+    bool set_mode(modem_mode mode) override
+    {
+        return true;
+    }
+
+    static esp_err_t init(esp_netif_t *netif)
+    {
+        // configure
+        esp_modem_dte_config_t dte_config = ESP_MODEM_DTE_DEFAULT_CONFIG();
+        dte_config.uart_config.baud_rate = 921600;  // check also 460800
+        esp_modem_dce_config dce_config = ESP_MODEM_DCE_DEFAULT_CONFIG("");
+
+        // create DTE and minimal network DCE
+        auto uart_dte = create_uart_dte(&dte_config);
+        dce = NetDCE_Factory::create<NetModule>(&dce_config, uart_dte, netif);
+        return dce == nullptr ? ESP_FAIL : ESP_OK;
+    }
+
+    static void deinit()
+    {
+        delete dce;
+    }
+    static void start()
+    {
+        dce->set_data();
+    }
+    static void stop()
+    {
+        dce->exit_data();
+    }
+
+private:
+    static NetDCE *dce;
+    std::shared_ptr<DTE> dte;
+};
+
+NetDCE *NetModule::dce = nullptr;
+
+extern "C" esp_err_t modem_init_network(esp_netif_t *netif)
+{
+    return NetModule::init(netif);
+}
+
+extern "C" esp_err_t modem_start_network()
+{
+    NetModule::start();
+    return ESP_OK;
+}
+
+extern "C" void modem_stop_network()
+{
+    NetModule::stop();
+}

components/esp_modem/test/target_iperf/main/cmd_pppclient.c

@@ -0,0 +1,289 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/event_groups.h"
+#include "sys/socket.h" // for INADDR_ANY
+#include "esp_netif.h"
+#include "esp_log.h"
+#include "esp_system.h"
+#include "esp_event.h"
+#include "esp_log.h"
+#include "esp_netif.h"
+#include "esp_netif_ppp.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/event_groups.h"
+
+#include "esp_console.h"
+#include "esp_event.h"
+#include "esp_bit_defs.h"
+#include "argtable3/argtable3.h"
+#include "iperf.h"
+#include "sdkconfig.h"
+#include "network_dce.h"
+
+static const char *TAG = "pppd_test";
+static EventGroupHandle_t event_group = NULL;
+static esp_netif_t *s_ppp_netif;
+static const int GOTIP_BIT = BIT0;
+
+static void on_modem_event(void *arg, esp_event_base_t event_base,
+                           int32_t event_id, void *event_data)
+{
+    if (event_base == IP_EVENT) {
+        ESP_LOGD(TAG, "IP event! %" PRIu32, event_id);
+        if (event_id == IP_EVENT_PPP_GOT_IP) {
+            esp_netif_dns_info_t dns_info;
+
+
+            ip_event_got_ip_t *event = (ip_event_got_ip_t *)event_data;
+            esp_netif_t *netif = event->esp_netif;
+
+            ESP_LOGI(TAG, "Modem Connect to PPP Server");
+            ESP_LOGI(TAG, "~~~~~~~~~~~~~~");
+            ESP_LOGI(TAG, "IP          : " IPSTR, IP2STR(&event->ip_info.ip));
+            ESP_LOGI(TAG, "Netmask     : " IPSTR, IP2STR(&event->ip_info.netmask));
+            ESP_LOGI(TAG, "Gateway     : " IPSTR, IP2STR(&event->ip_info.gw));
+            esp_netif_get_dns_info(netif, ESP_NETIF_DNS_MAIN, &dns_info);
+            ESP_LOGI(TAG, "Name Server1: " IPSTR, IP2STR(&dns_info.ip.u_addr.ip4));
+            esp_netif_get_dns_info(netif, ESP_NETIF_DNS_BACKUP, &dns_info);
+            ESP_LOGI(TAG, "Name Server2: " IPSTR, IP2STR(&dns_info.ip.u_addr.ip4));
+            ESP_LOGI(TAG, "~~~~~~~~~~~~~~");
+
+            ESP_LOGI(TAG, "GOT ip event!!!");
+            xEventGroupSetBits(event_group, GOTIP_BIT);
+        } else if (event_id == IP_EVENT_PPP_LOST_IP) {
+            ESP_LOGI(TAG, "Modem Disconnect from PPP Server");
+        } else if (event_id == IP_EVENT_GOT_IP6) {
+            ESP_LOGI(TAG, "GOT IPv6 event!");
+            ip_event_got_ip6_t *event = (ip_event_got_ip6_t *)event_data;
+            ESP_LOGI(TAG, "Got IPv6 address " IPV6STR, IPV62STR(event->ip6_info.ip));
+        }
+    }
+}
+
+static void on_ppp_changed(void *arg, esp_event_base_t event_base,
+                           int32_t event_id, void *event_data)
+{
+    ESP_LOGI(TAG, "PPP state changed event %" PRId32, event_id);
+    if (event_id == NETIF_PPP_ERRORUSER) {
+        /* User interrupted event from esp-netif */
+        esp_netif_t *netif = (esp_netif_t *)event_data;
+        ESP_LOGI(TAG, "User interrupted event from netif:%p", netif);
+        xEventGroupSetBits(event_group, 2);
+    }
+}
+
+/* "pppd" command */
+static struct {
+    struct arg_str *control;
+    struct arg_end *end;
+} pppd_control_args;
+
+static int pppd_cmd_control(int argc, char **argv)
+{
+    int nerrors = arg_parse(argc, argv, (void **)&pppd_control_args);
+    if (nerrors != 0) {
+        arg_print_errors(stderr, pppd_control_args.end, argv[0]);
+        return 1;
+    }
+
+    if (!strncmp(pppd_control_args.control->sval[0], "info", 4)) {
+        esp_netif_ip_info_t ip;
+        printf("%s:\n", esp_netif_get_desc(s_ppp_netif));
+        esp_netif_get_ip_info(s_ppp_netif, &ip);
+        printf("  IP: " IPSTR "\r\n", IP2STR(&ip.ip));
+        printf("  MASK: " IPSTR "\r\n", IP2STR(&ip.netmask));
+        printf("  GW: " IPSTR "\r\n", IP2STR(&ip.gw));
+    }
+    return 0;
+}
+
+/* "iperf" command */
+
+static struct {
+    struct arg_str *ip;
+    struct arg_lit *server;
+    struct arg_lit *udp;
+    struct arg_lit *version;
+    struct arg_int *port;
+    struct arg_int *length;
+    struct arg_int *interval;
+    struct arg_int *time;
+    struct arg_int *bw_limit;
+    struct arg_lit *abort;
+    struct arg_end *end;
+} iperf_args;
+
+static int ppp_cmd_iperf(int argc, char **argv)
+{
+    int nerrors = arg_parse(argc, argv, (void **)&iperf_args);
+    iperf_cfg_t cfg;
+
+    if (nerrors != 0) {
+        arg_print_errors(stderr, iperf_args.end, argv[0]);
+        return 0;
+    }
+
+    memset(&cfg, 0, sizeof(cfg));
+
+    // ethernet iperf only support IPV4 address
+    cfg.type = IPERF_IP_TYPE_IPV4;
+
+    /* iperf -a */
+    if (iperf_args.abort->count != 0) {
+        iperf_stop();
+        return 0;
+    }
+
+    if (((iperf_args.ip->count == 0) && (iperf_args.server->count == 0)) ||
+            ((iperf_args.ip->count != 0) && (iperf_args.server->count != 0))) {
+        ESP_LOGE(__func__, "Wrong mode! ESP32 should run in client or server mode");
+        return 0;
+    }
+
+    /* iperf -s */
+    if (iperf_args.ip->count == 0) {
+        cfg.flag |= IPERF_FLAG_SERVER;
+    }
+    /* iperf -c SERVER_ADDRESS */
+    else {
+        cfg.destination_ip4 = esp_ip4addr_aton(iperf_args.ip->sval[0]);
+        cfg.flag |= IPERF_FLAG_CLIENT;
+    }
+
+    if (iperf_args.length->count == 0) {
+        cfg.len_send_buf = 0;
+    } else {
+        cfg.len_send_buf = iperf_args.length->ival[0];
+    }
+
+    /* wait for ip, could blocked here */
+    xEventGroupWaitBits(event_group, GOTIP_BIT, pdFALSE, pdTRUE, portMAX_DELAY);
+
+    cfg.source_ip4 = INADDR_ANY;
+
+    /* iperf -u */
+    if (iperf_args.udp->count == 0) {
+        cfg.flag |= IPERF_FLAG_TCP;
+    } else {
+        cfg.flag |= IPERF_FLAG_UDP;
+    }
+
+    /* iperf -p */
+    if (iperf_args.port->count == 0) {
+        cfg.sport = IPERF_DEFAULT_PORT;
+        cfg.dport = IPERF_DEFAULT_PORT;
+    } else {
+        if (cfg.flag & IPERF_FLAG_SERVER) {
+            cfg.sport = iperf_args.port->ival[0];
+            cfg.dport = IPERF_DEFAULT_PORT;
+        } else {
+            cfg.sport = IPERF_DEFAULT_PORT;
+            cfg.dport = iperf_args.port->ival[0];
+        }
+    }
+
+    /* iperf -i */
+    if (iperf_args.interval->count == 0) {
+        cfg.interval = IPERF_DEFAULT_INTERVAL;
+    } else {
+        cfg.interval = iperf_args.interval->ival[0];
+        if (cfg.interval <= 0) {
+            cfg.interval = IPERF_DEFAULT_INTERVAL;
+        }
+    }
+
+    /* iperf -t */
+    if (iperf_args.time->count == 0) {
+        cfg.time = IPERF_DEFAULT_TIME;
+    } else {
+        cfg.time = iperf_args.time->ival[0];
+        if (cfg.time <= cfg.interval) {
+            cfg.time = cfg.interval;
+        }
+    }
+
+    /* iperf -b */
+    if (iperf_args.bw_limit->count == 0) {
+        cfg.bw_lim = IPERF_DEFAULT_NO_BW_LIMIT;
+    } else {
+        cfg.bw_lim = iperf_args.bw_limit->ival[0];
+        if (cfg.bw_lim <= 0) {
+            cfg.bw_lim = IPERF_DEFAULT_NO_BW_LIMIT;
+        }
+    }
+
+    printf("mode=%s-%s sip=" IPSTR ":%" PRIu16 ", dip=%" PRIu32 ".%" PRIu32 ".%" PRIu32 ".%" PRIu32 ":%" PRIu16 ", interval=%" PRIu32 ", time=%" PRIu32 "\r\n",
+           cfg.flag & IPERF_FLAG_TCP ? "tcp" : "udp",
+           cfg.flag & IPERF_FLAG_SERVER ? "server" : "client",
+           (uint16_t) cfg.source_ip4 & 0xFF,
+           (uint16_t) (cfg.source_ip4 >> 8) & 0xFF,
+           (uint16_t) (cfg.source_ip4 >> 16) & 0xFF,
+           (uint16_t) (cfg.source_ip4 >> 24) & 0xFF,
+           cfg.sport,
+           cfg.destination_ip4 & 0xFF, (cfg.destination_ip4 >> 8) & 0xFF,
+           (cfg.destination_ip4 >> 16) & 0xFF, (cfg.destination_ip4 >> 24) & 0xFF, cfg.dport,
+           cfg.interval, cfg.time);
+
+    iperf_start(&cfg);
+    return 0;
+}
+
+void register_pppd(void)
+{
+    event_group = xEventGroupCreate();
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    ESP_ERROR_CHECK(esp_netif_init());
+
+    esp_netif_config_t ppp_netif_config = ESP_NETIF_DEFAULT_PPP();
+    s_ppp_netif = esp_netif_new(&ppp_netif_config);
+    assert(s_ppp_netif);
+    esp_netif_ppp_config_t ppp_config = { true, true };
+    esp_netif_ppp_set_params(s_ppp_netif, &ppp_config);
+
+    ESP_ERROR_CHECK(modem_init_network(s_ppp_netif));
+    ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, ESP_EVENT_ANY_ID, on_modem_event, NULL));
+    ESP_ERROR_CHECK(esp_event_handler_register(NETIF_PPP_STATUS, ESP_EVENT_ANY_ID, on_ppp_changed, NULL));
+
+    modem_start_network();
+
+    pppd_control_args.control = arg_str1(NULL, NULL, "<info>", "Get info of pppd");
+    pppd_control_args.end = arg_end(1);
+    const esp_console_cmd_t cmd = {
+        .command = "pppd",
+        .help = "PPP interface IO control",
+        .hint = NULL,
+        .func = pppd_cmd_control,
+        .argtable = &pppd_control_args
+    };
+    ESP_ERROR_CHECK(esp_console_cmd_register(&cmd));
+
+    iperf_args.ip = arg_str0("c", "client", "<ip>",
+                             "run in client mode, connecting to <host>");
+    iperf_args.server = arg_lit0("s", "server", "run in server mode");
+    iperf_args.udp = arg_lit0("u", "udp", "use UDP rather than TCP");
+    iperf_args.version = arg_lit0("V", "ipv6_domain", "use IPV6 address rather than IPV4");
+    iperf_args.port = arg_int0("p", "port", "<port>",
+                               "server port to listen on/connect to");
+    iperf_args.length = arg_int0("l", "len", "<length>", "set read/write buffer size");
+    iperf_args.interval = arg_int0("i", "interval", "<interval>",
+                                   "seconds between periodic bandwidth reports");
+    iperf_args.time = arg_int0("t", "time", "<time>", "time in seconds to transmit for (default 10 secs)");
+    iperf_args.bw_limit = arg_int0("b", "bandwidth", "<bandwidth>", "bandwidth to send at in Mbits/sec");
+    iperf_args.abort = arg_lit0("a", "abort", "abort running iperf");
+    iperf_args.end = arg_end(1);
+    const esp_console_cmd_t iperf_cmd = {
+        .command = "iperf",
+        .help = "iperf command",
+        .hint = NULL,
+        .func = &ppp_cmd_iperf,
+        .argtable = &iperf_args
+    };
+    ESP_ERROR_CHECK(esp_console_cmd_register(&iperf_cmd));
+}

components/esp_modem/test/target_iperf/main/network_dce.h

@@ -0,0 +1,26 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+
+#pragma once
+#include "esp_err.h"
+#include "esp_netif.h"
+
+/**
+ * @brief Initialize PPP network (with a generic PPP server)
+ * @param netif PPP netif
+ * @return ESP_OK on success
+ */
+esp_err_t modem_init_network(esp_netif_t *netif);
+
+/**
+ * @brief Start PPP network
+ */
+void modem_start_network();
+
+/**
+ * @brief Stop PPP network
+ */
+void modem_stop_network();

components/esp_modem/test/target_iperf/main/pppd_iperf_main.c

@@ -0,0 +1,43 @@
+/*
+ * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+#include <stdio.h>
+#include <string.h>
+#include "sdkconfig.h"
+#include "esp_log.h"
+#include "esp_console.h"
+#include "cmd_system.h"
+
+void register_pppd(void);
+
+void app_main(void)
+{
+    esp_console_repl_t *repl = NULL;
+    esp_console_repl_config_t repl_config = ESP_CONSOLE_REPL_CONFIG_DEFAULT();
+    esp_console_dev_uart_config_t uart_config = ESP_CONSOLE_DEV_UART_CONFIG_DEFAULT();
+    repl_config.prompt = "iperf>";
+    // init console REPL environment
+    ESP_ERROR_CHECK(esp_console_new_repl_uart(&uart_config, &repl_config, &repl));
+
+    /* Register commands */
+    register_system_common();
+    register_pppd();
+
+    printf("\n =======================================================\n");
+    printf(" |       Steps to Test PPP Client Bandwidth            |\n");
+    printf(" |                                                     |\n");
+    printf(" |  1. Enter 'help', check all supported commands      |\n");
+    printf(" |  2. Start PPP server on host system                 |\n");
+    printf(" |     - pppd /dev/ttyUSB1 115200 192.168.11.1:192.168.11.2 modem local noauth debug nocrtscts nodetach +ipv6\n");
+    printf(" |  3. Wait ESP32 to get IP from PPP server            |\n");
+    printf(" |  4. Enter 'pppd info' (optional)                    |\n");
+    printf(" |  5. Server: 'iperf -u -s -i 3'                      |\n");
+    printf(" |  6. Client: 'iperf -u -c SERVER_IP -t 60 -i 3'      |\n");
+    printf(" |                                                     |\n");
+    printf(" =======================================================\n\n");
+
+    // start console REPL
+    ESP_ERROR_CHECK(esp_console_start_repl(repl));
+}

components/esp_modem/test/target_iperf/pytest_ppp_iperf.py

@@ -0,0 +1,112 @@
+# SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: Unlicense OR CC0-1.0
+"""
+Test case for iperf example.
+
+This test case might have problem running on Windows:
+
+- use `sudo killall iperf` to force kill iperf, didn't implement windows version
+
+"""
+from __future__ import division, unicode_literals
+
+import logging
+import os
+import subprocess
+
+import pytest
+from common_test_methods import get_host_ip4_by_dest_ip
+from idf_iperf_test_util import IperfUtility
+from pytest_embedded import Dut
+
+try:
+    from typing import Any, Callable, Tuple
+except ImportError:
+    # Only used for type annotations
+    pass
+
+NO_BANDWIDTH_LIMIT = -1  # iperf send bandwidth is not limited
+
+
+class IperfTestUtilityEth(IperfUtility.IperfTestUtility):
+    """ iperf test implementation """
+    def __init__(self, dut: str, config_name: str, pc_nic_ip: str, pc_iperf_log_file: str, test_result:Any=None) -> None:
+        IperfUtility.IperfTestUtility.__init__(self, dut, config_name, 'None', 'None', pc_nic_ip, pc_iperf_log_file, test_result)
+
+    def setup(self) -> Tuple[str,int]:
+        """
+        setup iperf test:
+
+        1. kill current iperf process
+        2. reboot DUT (currently iperf is not very robust, need to reboot DUT)
+        """
+        try:
+            subprocess.check_output('sudo killall iperf 2>&1 > /dev/null', shell=True)
+        except subprocess.CalledProcessError:
+            pass
+        self.dut.write('restart')
+        dut_ip = self.dut.expect(r'pppd_test: IP          : (\d+\.\d+\.\d+\.\d+)').group(1)
+        self.dut.expect("Type 'help' to get the list of commands.")
+        self.dut.expect('iperf>')
+        rssi = 0
+        return dut_ip, rssi
+
+
+@pytest.fixture
+def log_performance(record_property: Callable[[str, object], None]) -> Callable[[str, str], None]:
+    """
+    log performance item with pre-defined format to the console
+    and record it under the ``properties`` tag in the junit report if available.
+    """
+
+    def real_func(item: str, value: str) -> None:
+        """
+        :param item: performance item name
+        :param value: performance value
+        """
+        logging.info('[Performance][%s]: %s', item, value)
+
+    return real_func
+
+
+def test_esp_pppd_iperf(
+    dut: Dut,
+    log_performance: Callable[[str, object], None],
+    # check_performance: Callable[[str, float, str], None],
+) -> None:
+    """
+    steps: |
+      1. test TCP tx rx and UDP tx rx throughput
+      2. compare with the pre-defined pass standard
+    """
+
+    # 1. preparing
+    pc_iperf_log_file = os.path.join(dut.logdir, 'pc_iperf_log.md')
+    # 2. wait for DUT
+    dut_ip = dut.expect(r'pppd_test: IP          : (\d+\.\d+\.\d+\.\d+)').group(1)
+
+    pc_nic_ip = get_host_ip4_by_dest_ip(dut_ip)
+    test_result = {
+        'tcp_tx': IperfUtility.TestResult('tcp', 'tx', 'ppp_client'),
+        'tcp_rx': IperfUtility.TestResult('tcp', 'rx', 'ppp_client'),
+        'udp_tx': IperfUtility.TestResult('udp', 'tx', 'ppp_client'),
+        'udp_rx': IperfUtility.TestResult('udp', 'rx', 'ppp_client'),
+    }
+    test_utility = IperfTestUtilityEth(dut, 'ppp', pc_nic_ip, pc_iperf_log_file, test_result)
+
+    # 3. run test for TCP Tx, Rx and UDP Tx, Rx
+    test_utility.run_test('tcp', 'tx', 0, 5)
+    test_utility.run_test('tcp', 'rx', 0, 5)
+    test_utility.run_test('udp', 'tx', 0, 5)
+    test_utility.run_test('udp', 'rx', 0, 5)
+
+    # 4. print out performance details
+    for throughput_type in test_result:
+        print('{}_throughput'.format(throughput_type))
+        print(test_result[throughput_type])
+        print('---------------------------')
+
+    # 5. log performance summary
+    for throughput_type in test_result:
+        log_performance('{}_throughput'.format(throughput_type),
+                        '{:.02f} Mbps'.format(test_result[throughput_type].get_best_throughput()))