Test: Initial version of modem tests

esp_modem/CMakeLists.txt

@@ -1,18 +1,31 @@
-set(srcs "src/esp_modem_dte.cpp"
+idf_build_get_property(target IDF_TARGET)
+
+if(${target} STREQUAL "linux")
+    set(platform_srcs src/esp_modem_primitives_linux.cpp
+        src/esp_modem_uart_linux.cpp
+        src/esp_modem_netif_linux.cpp)
+    set(dependencies esp_system_protocols_linux)
+else()
+    set(platform_srcs src/esp_modem_primitives_freertos.cpp
+                      src/esp_modem_uart.cpp
+                      src/esp_modem_netif.cpp)
+    set(dependencies driver)
+endif()
+
+set(srcs ${platform_srcs}
+        "src/esp_modem_dte.cpp"
         "src/esp_modem_dce.cpp"
-        "src/esp_modem_netif.cpp"
         "src/esp_modem_api.cpp"
         "src/esp_modem_factory.cpp"
         "src/esp_modem_cmux.cpp"
         "src/esp_modem_command_library.cpp"
-        "src/esp_modem_modules.cpp"
-        "src/esp_modem_uart.cpp")
+        "src/esp_modem_modules.cpp")
 
 set(include_dirs "include")
 
 idf_component_register(SRCS "${srcs}"
                     INCLUDE_DIRS "${include_dirs}"
                     PRIV_INCLUDE_DIRS private_include
-                    REQUIRES driver)
+                    REQUIRES ${dependencies})
 
-target_compile_features(${COMPONENT_LIB} PRIVATE cxx_std_17)
+target_compile_features(${COMPONENT_LIB} PRIVATE cxx_std_17)

esp_modem/include/cxx_include/esp_modem_dce.hpp

@@ -58,9 +58,10 @@ public:
         return dte->command(command, std::move(got_line), time_ms);
     }
 
-protected:
     bool set_mode(modem_mode m) { return mode.set(dte.get(), module.get(), netif, m); }
 
+protected:
+
 
     std::shared_ptr<DTE> dte;
     std::shared_ptr<SpecificModule> module;

esp_modem/include/cxx_include/esp_modem_dce_factory.hpp

@@ -50,12 +50,12 @@ template<typename Module>
 class Builder {
     static_assert(std::is_base_of<ModuleIf, Module>::value, "Builder must be used only for Module classes");
 public:
-    explicit Builder(std::shared_ptr<DTE> dte): dte(std::move(dte))
-    {
-        esp_netif_config_t netif_config = ESP_NETIF_DEFAULT_PPP();
-        netif = esp_netif_new(&netif_config);
-        throw_if_false(netif != nullptr, "Cannot create default PPP netif");
-    }
+//    explicit Builder(std::shared_ptr<DTE> dte): dte(std::move(dte))
+//    {
+//        esp_netif_config_t netif_config = ESP_NETIF_DEFAULT_PPP();
+//        netif = esp_netif_new(&netif_config);
+//        throw_if_false(netif != nullptr, "Cannot create default PPP netif");
+//    }
 
     Builder(std::shared_ptr<DTE> x, esp_netif_t* esp_netif): dte(std::move(x)), module(nullptr), netif(esp_netif)
     {

esp_modem/include/cxx_include/esp_modem_dte.hpp

@@ -69,7 +69,7 @@ private:
 
     void setup_cmux();
 
-    static const size_t GOT_LINE = BIT0;
+    static const size_t GOT_LINE = signal_group::bit0;
     size_t buffer_size;
     size_t consumed;
     std::unique_ptr<uint8_t[]> buffer;

esp_modem/include/cxx_include/esp_modem_exception.hpp

@@ -0,0 +1,66 @@
+// Copyright 2021 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _ESP_MODEM_EXCEPTION_HPP_
+#define _ESP_MODEM_EXCEPTION_HPP_
+
+#include <string>
+#include "esp_err.h"
+
+namespace esp_modem {
+
+#ifdef CONFIG_COMPILER_CXX_EXCEPTIONS
+#define THROW(exception) throw(exception)
+class esp_err_exception: virtual public std::exception {
+public:
+    explicit esp_err_exception(esp_err_t err): esp_err(err) {}
+    explicit esp_err_exception(std::string msg): esp_err(ESP_FAIL), message(std::move(msg)) {}
+    explicit esp_err_exception(std::string msg, esp_err_t err): esp_err(err), message(std::move(msg)) {}
+    virtual esp_err_t get_err_t() { return esp_err; }
+    ~esp_err_exception() noexcept override = default;
+    virtual const char* what() const noexcept {
+        return message.c_str();
+    }
+private:
+    esp_err_t esp_err;
+    std::string message;
+};
+#else
+#define THROW(exception) abort()
+#endif
+
+static inline void throw_if_false(bool condition, std::string message)
+{
+    if (!condition) {
+        THROW(esp_err_exception(std::move(message)));
+    }
+}
+
+static inline void throw_if_esp_fail(esp_err_t err, std::string message)
+{
+    if (err != ESP_OK) {
+        THROW(esp_err_exception(std::move(message), err));
+    }
+}
+
+static inline void throw_if_esp_fail(esp_err_t err)
+{
+    if (err != ESP_OK) {
+        THROW(esp_err_exception(err));
+    }
+}
+
+} // namespace esp_modem
+
+#endif //_ESP_MODEM_EXCEPTION_HPP_

esp_modem/include/cxx_include/esp_modem_netif.hpp

@@ -15,6 +15,8 @@
 #ifndef _ESP_MODEM_NETIF_HPP
 #define _ESP_MODEM_NETIF_HPP
 
+#include <memory>
+#include <cstddef>
 #include "esp_netif.h"
 #include "cxx_include/esp_modem_primitives.hpp"
 
@@ -36,7 +38,7 @@ public:
 
     void start();
 
-    void wait_until_ppp_exits() { signal.wait(PPP_EXIT, 30000); }
+    void wait_until_ppp_exits();
 
     void stop();
 
@@ -53,8 +55,8 @@ private:
     esp_netif_t *netif;
     struct ppp_netif_driver driver{};
     signal_group signal;
-    static const size_t PPP_STARTED = BIT0;
-    static const size_t PPP_EXIT = BIT1;
+    static const size_t PPP_STARTED = signal_group::bit0;
+    static const size_t PPP_EXIT = signal_group::bit1;
 };
 
 } // namespace esp_modem

esp_modem/include/cxx_include/esp_modem_primitives.hpp

@@ -14,116 +14,73 @@
 
 #ifndef _ESP_MODEM_PRIMITIVES_HPP_
 #define _ESP_MODEM_PRIMITIVES_HPP_
-#include "freertos/FreeRTOS.h"
-#include "freertos/event_groups.h"
-#include "freertos/semphr.h"
+#include "esp_modem_exception.hpp"
+
+#if defined(CONFIG_IDF_TARGET_LINUX)
+#include <mutex>
+#else
+// forward declarations of FreeRTOS primitives
+struct QueueDefinition;
+typedef void * EventGroupHandle_t;
+#endif
+
 
 namespace esp_modem {
 
-#ifdef CONFIG_COMPILER_CXX_EXCEPTIONS
-#define THROW(exception) throw(exception)
-class esp_err_exception: virtual public std::exception {
-public:
-    explicit esp_err_exception(esp_err_t err): esp_err(err) {}
-    explicit esp_err_exception(std::string msg): esp_err(ESP_FAIL), message(std::move(msg)) {}
-    explicit esp_err_exception(std::string msg, esp_err_t err): esp_err(err), message(std::move(msg)) {}
-    virtual esp_err_t get_err_t() { return esp_err; }
-    ~esp_err_exception() noexcept override = default;
-    virtual const char* what() const noexcept {
-        return message.c_str();
-    }
-private:
-    esp_err_t esp_err;
-    std::string message;
-};
-#else
-#define THROW(exception) abort()
-#endif
-
-static inline void throw_if_false(bool condition, std::string message)
-{
-    if (!condition) {
-        THROW(esp_err_exception(std::move(message)));
-    }
-}
-
-static inline void throw_if_esp_fail(esp_err_t err, std::string message)
-{
-    if (err != ESP_OK) {
-        THROW(esp_err_exception(std::move(message), err));
-    }
-}
-
-static inline void throw_if_esp_fail(esp_err_t err)
-{
-    if (err != ESP_OK) {
-        THROW(esp_err_exception(err));
-    }
-}
-
+#if !defined(CONFIG_IDF_TARGET_LINUX)
 struct Lock {
-    explicit Lock(): lock(nullptr)
-    {
-        lock = xSemaphoreCreateRecursiveMutex();
-        throw_if_false(lock != nullptr, "create signal event group failed");
-    }
-    ~Lock() { vSemaphoreDelete(lock); }
-    void take() { xSemaphoreTakeRecursive(lock, portMAX_DELAY); }
+    using MutexT = QueueDefinition*;
 
-    void give() { xSemaphoreGiveRecursive(lock); }
-    xSemaphoreHandle lock;
+    explicit Lock();
+    ~Lock();
+    void lock();
+    void unlock();
+private:
+    MutexT m{};
 };
 
+using Signal = void*;
+
+#else
+using Lock = std::mutex;
+struct SignalGroup;
+using Signal = std::unique_ptr<SignalGroup>;
+#endif
+
 template<class T>
 class Scoped {
 public:
-    explicit Scoped(T &l):lock(l) { lock.take(); }
-    ~Scoped() { lock.give(); }
+    explicit Scoped(T &l):lock(l) { lock.lock(); }
+    ~Scoped() { lock.unlock(); }
 
 private:
     T& lock;
 };
 
 struct signal_group {
-    explicit signal_group(): event_group(nullptr)
-    {
-        event_group = xEventGroupCreate();
-        throw_if_false(event_group != nullptr, "create signal event group failed");
-    }
+    static constexpr size_t bit0 = 1 << 0;
+    static constexpr size_t bit1 = 1 << 1;
+    static constexpr size_t bit2 = 1 << 2;
+    static constexpr size_t bit3 = 1 << 3;
 
-    void set(uint32_t bits)
-    {
-        xEventGroupSetBits(event_group, bits);
-    }
+    explicit signal_group();
 
-    void clear(uint32_t bits)
-    {
-        xEventGroupClearBits(event_group, bits);
-    }
+    void set(uint32_t bits);
 
-    bool wait(uint32_t flags, uint32_t time_ms) // waiting for all and clearing if set
-    {
-        EventBits_t bits = xEventGroupWaitBits(event_group, flags, pdTRUE, pdTRUE, pdMS_TO_TICKS(time_ms));
-        return bits & flags;
-    }
+    void clear(uint32_t bits);
 
-    bool is_any(uint32_t flags)
-    {
-        return xEventGroupGetBits(event_group) & flags;
-    }
+    // waiting for all and clearing if set
+    bool wait(uint32_t flags, uint32_t time_ms);
 
-    bool wait_any(uint32_t flags, uint32_t time_ms) // waiting for any bit, not clearing them
-    {
-        EventBits_t bits = xEventGroupWaitBits(event_group, flags, pdFALSE, pdFALSE, pdMS_TO_TICKS(time_ms));
-        return bits & flags;
-    }
+    bool is_any(uint32_t flags);
 
-    ~signal_group()
-    {
-        if (event_group) vEventGroupDelete(event_group);
-    }
+    // waiting for any bit, not clearing them
+    bool wait_any(uint32_t flags, uint32_t time_ms);
 
-    EventGroupHandle_t event_group;
+    ~signal_group();
+
+private:
+    Signal event_group;
 };
 
 } // namespace esp_modem

esp_modem/src/esp_modem_api.cpp

@@ -12,6 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include <cassert>
 #include "cxx_include/esp_modem_dte.hpp"
 #include "uart_terminal.hpp"
 #include "esp_log.h"

esp_modem/src/esp_modem_cmux.cpp

@@ -13,6 +13,7 @@
 // limitations under the License.
 
 #include <cstring>
+#include <unistd.h>
 #include "cxx_include/esp_modem_dte.hpp"
 #include "esp_log.h"
 
@@ -87,7 +88,7 @@ void CMUXedTerminal::start()
     for (size_t i = 0; i < 3; i++)
     {
         send_sabm(i);
-        vTaskDelay(100 / portTICK_PERIOD_MS); // Waiting before open next DLC
+        usleep(100'000);
     }
 }
 
@@ -110,13 +111,13 @@ bool CMUXedTerminal::process_cmux_recv(size_t len)
 
 bool output(uint8_t *data, size_t len, std::string message)
 {
-    printf("OUTPUT: %s len=%d \n", message.c_str(), len);
+//    printf("OUTPUT: %s len=%ld \n", message.c_str(), len);
     for (int i=0; i< len; ++i) {
         printf("0x%02x, ",data[i]);
     }
     printf("----\n");
 
-    printf("%.*s", len, data);
+    printf("%.*s", (int)len, data);
     return true;
 }
 
@@ -219,7 +220,7 @@ void CMUXedTerminal::setup_cmux()
     for (size_t i = 0; i < 3; i++)
     {
         send_sabm(i);
-        vTaskDelay(100 / portTICK_PERIOD_MS); // Waiting before open next DLC
+        usleep(100'000);
     }
 }
 
@@ -235,8 +236,6 @@ void DTE::setup_cmux()
 
 void DTE::send_cmux_command(uint8_t i, const std::string& command)
 {
-//    send_sabm(i);
-//    vTaskDelay(100 / portTICK_PERIOD_MS); // Waiting before open next DLC
 
     uint8_t frame[6];
     frame[0] = SOF_MARKER;

esp_modem/src/esp_modem_dte.cpp

@@ -29,7 +29,6 @@ command_result DTE::command(const std::string &command, got_line_cb got_line, ui
 {
     Scoped<Lock> l(lock);
     command_result res = command_result::TIMEOUT;
-    term->write((uint8_t *)command.c_str(), command.length());
     term->set_data_cb([&](size_t len){
         auto data_to_read = std::min(len, buffer_size - consumed);
         auto data = buffer.get() + consumed;
@@ -44,6 +43,7 @@ command_result DTE::command(const std::string &command, got_line_cb got_line, ui
         }
         return false;
     });
+    term->write((uint8_t *)command.c_str(), command.length());
     auto got_lf = signal.wait(GOT_LINE, time_ms);
     if (got_lf && res == command_result::TIMEOUT) {
         throw_if_esp_fail(ESP_ERR_INVALID_STATE);

esp_modem/src/esp_modem_netif.cpp

@@ -53,7 +53,7 @@ esp_err_t Netif::esp_modem_post_attach(esp_netif_t *esp_netif, void *args) {
     // check if PPP error events are enabled, if not, do enable the error occurred/state changed
     // to notify the modem layer when switching modes
     esp_netif_ppp_config_t ppp_config;
-    esp_netif_ppp_get_params(esp_netif, &ppp_config);
+    // esp_netif_ppp_get_params(esp_netif, &ppp_config);
     if (!ppp_config.ppp_error_event_enabled) {
         ppp_config.ppp_error_event_enabled = true;
         esp_netif_ppp_set_params(esp_netif, &ppp_config);
@@ -102,4 +102,8 @@ Netif::~Netif() {
     esp_event_handler_unregister(IP_EVENT, IP_EVENT_PPP_LOST_IP, esp_netif_action_disconnected);
 }
 
+void Netif::wait_until_ppp_exits() {
+    signal.wait(PPP_EXIT, 30000);
+}
+
 } // namespace esp_modem

esp_modem/src/esp_modem_netif_linux.cpp

@@ -0,0 +1,51 @@
+// Copyright 2021 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "cxx_include/esp_modem_netif.hpp"
+
+namespace esp_modem {
+
+void Netif::on_ppp_changed(void *arg, esp_event_base_t event_base,
+                           int32_t event_id, void *event_data) {
+}
+
+esp_err_t Netif::esp_modem_dte_transmit(void *h, void *buffer, size_t len) {
+    return ESP_OK;
+}
+
+esp_err_t Netif::esp_modem_post_attach(esp_netif_t *esp_netif, void *args) {
+    return ESP_OK;
+}
+
+void Netif::receive(uint8_t *data, size_t len) {
+}
+
+Netif::Netif(std::shared_ptr<DTE> e, esp_netif_t *ppp_netif) :
+        ppp_dte(std::move(e)), netif(ppp_netif) {
+}
+
+void Netif::start() {
+}
+
+void Netif::stop() {
+}
+
+Netif::~Netif() {
+}
+
+void Netif::wait_until_ppp_exits() {
+
+}
+
+} // namespace esp_modem

esp_modem/src/esp_modem_primitives_freertos.cpp

@@ -0,0 +1,84 @@
+// Copyright 2021 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "cxx_include/esp_modem_primitives.hpp"
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/event_groups.h"
+#include "freertos/semphr.h"
+
+
+
+namespace esp_modem {
+
+
+
+void Lock::unlock() {
+    xSemaphoreGiveRecursive(m);
+}
+
+Lock::Lock(): m(nullptr)
+{
+    m = xSemaphoreCreateRecursiveMutex();
+    throw_if_false(m != nullptr, "create signal event group failed");
+}
+
+Lock::~Lock() {
+    vSemaphoreDelete(m);
+}
+
+void Lock::lock() {
+    xSemaphoreTakeRecursive(m, portMAX_DELAY);
+}
+
+
+signal_group::signal_group(): event_group(nullptr)
+{
+    event_group = xEventGroupCreate();
+    throw_if_false(event_group != nullptr, "create signal event group failed");
+}
+
+void signal_group::set(uint32_t bits)
+{
+    xEventGroupSetBits(event_group, bits);
+}
+
+void signal_group::clear(uint32_t bits)
+{
+    xEventGroupClearBits(event_group, bits);
+}
+
+bool signal_group::wait(uint32_t flags, uint32_t time_ms)
+{
+    EventBits_t bits = xEventGroupWaitBits(event_group, flags, pdTRUE, pdTRUE, pdMS_TO_TICKS(time_ms));
+    return bits & flags;
+}
+
+bool signal_group::is_any(uint32_t flags)
+{
+    return xEventGroupGetBits(event_group) & flags;
+}
+
+bool signal_group::wait_any(uint32_t flags, uint32_t time_ms)
+{
+    EventBits_t bits = xEventGroupWaitBits(event_group, flags, pdFALSE, pdFALSE, pdMS_TO_TICKS(time_ms));
+    return bits & flags;
+}
+
+signal_group::~signal_group()
+{
+    if (event_group) vEventGroupDelete(event_group);
+}
+
+} // namespace esp_modem

esp_modem/src/esp_modem_primitives_linux.cpp

@@ -0,0 +1,72 @@
+// Copyright 2021 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <condition_variable>
+#include "cxx_include/esp_modem_primitives.hpp"
+
+
+namespace esp_modem {
+
+struct SignalGroup {
+    std::condition_variable notify;
+    std::mutex m;
+    uint32_t flags{ 0 };
+};
+
+
+signal_group::signal_group(): event_group(std::make_unique<SignalGroup>())
+{
+}
+
+void signal_group::set(uint32_t bits)
+{
+    std::unique_lock<std::mutex> lock(event_group->m);
+    event_group->flags |= bits;
+}
+
+void signal_group::clear(uint32_t bits)
+{
+    std::unique_lock<std::mutex> lock(event_group->m);
+    event_group->flags &= ~bits;
+}
+
+bool signal_group::wait(uint32_t flags, uint32_t time_ms)
+{
+    std::unique_lock<std::mutex> lock(event_group->m);
+    return event_group->notify.wait_for(lock, std::chrono::milliseconds(time_ms), [&]{
+        if ((flags&event_group->flags) == flags) {
+            event_group->flags &= ~flags;
+            return true;
+        }
+        return false;
+    });
+//    return ret != std::cv_status::timeout;
+//    , [&]{return flags&event_group->flags; });
+}
+
+bool signal_group::is_any(uint32_t flags)
+{
+    std::unique_lock<std::mutex> lock(event_group->m);
+    return flags&event_group->flags;
+}
+
+bool signal_group::wait_any(uint32_t flags, uint32_t time_ms)
+{
+    std::unique_lock<std::mutex> lock(event_group->m);
+    return event_group->notify.wait_for(lock, std::chrono::milliseconds(time_ms), [&]{ return flags&event_group->flags; });
+}
+
+signal_group::~signal_group() = default;
+
+} // namespace esp_modem

esp_modem/src/esp_modem_uart_linux.cpp

@@ -0,0 +1,15 @@
+// Copyright 2021 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "cxx_include/esp_modem_dte.hpp"

esp_modem/test/host_test/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+
+set(EXTRA_COMPONENT_DIRS ../..)
+
+set(COMPONENTS main)
+project(host_modem_test)
+
+
+idf_component_get_property(esp_modem esp_modem COMPONENT_LIB)
+target_compile_definitions(${esp_modem} PRIVATE "-DCONFIG_COMPILER_CXX_EXCEPTIONS")
+target_compile_definitions(${esp_modem} PRIVATE "-DCONFIG_IDF_TARGET_LINUX")
+target_link_options(${esp_modem} INTERFACE -fsanitize=address)
+#set (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fno-omit-frame-pointer -fsanitize=address")
+#set (CMAKE_LINKER_FLAGS_DEBUG "${CMAKE_LINKER_FLAGS_DEBUG} -fno-omit-frame-pointer -fsanitize=address")

esp_modem/test/host_test/components/esp_event_mock/CMakeLists.txt

@@ -0,0 +1,3 @@
+idf_component_register(SRCS esp_event_mock.c
+                       INCLUDE_DIRS include
+                       REQUIRES esp_system_protocols_linux)

esp_modem/test/host_test/components/esp_event_mock/esp_event_mock.c

@@ -0,0 +1,21 @@
+//
+// Created by david on 2/11/21.
+//
+
+#include "esp_err.h"
+#include "esp_event.h"
+
+
+const char * WIFI_EVENT = "WIFI_EVENT";
+const char * IP_EVENT = "IP_EVENT";
+
+esp_err_t esp_event_handler_register(const char * event_base, int32_t event_id, void* event_handler, void* event_handler_arg)
+{
+    return ESP_OK;
+}
+
+
+esp_err_t esp_event_handler_unregister(const char * event_base, int32_t event_id, void* event_handler)
+{
+    return ESP_OK;
+}

esp_modem/test/host_test/components/esp_event_mock/include/esp_event.h

@@ -0,0 +1,35 @@
+//
+// Created by david on 2/9/21.
+//
+
+#ifndef MDNS_HOST_ESP_EVENT_H
+#define MDNS_HOST_ESP_EVENT_H
+
+#include <stdint.h>
+#include "esp_netif_ip_addr.h"
+#include "esp_err.h"
+
+
+typedef void * esp_event_base_t;
+typedef void * system_event_t;
+
+extern const char * WIFI_EVENT;
+extern const char * IP_EVENT;
+
+#define ESP_EVENT_ANY_BASE     NULL             /**< register handler for any event base */
+#define ESP_EVENT_ANY_ID       -1               /**< register handler for any event id */
+
+
+typedef struct {
+    int if_index;                    /*!< Interface index for which the event is received (left for legacy compilation) */
+    esp_netif_t *esp_netif;          /*!< Pointer to corresponding esp-netif object */
+    esp_netif_ip6_info_t ip6_info;   /*!< IPv6 address of the interface */
+    int ip_index;                    /*!< IPv6 address index */
+} ip_event_got_ip6_t;
+
+
+esp_err_t esp_event_handler_register(const char * event_base, int32_t event_id, void* event_handler, void* event_handler_arg);
+
+esp_err_t esp_event_handler_unregister(const char * event_base, int32_t event_id, void* event_handler);
+
+#endif //MDNS_HOST_ESP_EVENT_H

esp_modem/test/host_test/components/esp_event_mock/include/esp_event_base.h

@@ -0,0 +1,17 @@
+//
+// Created by david on 2/9/21.
+//
+
+#ifndef MDNS_HOST_ESP_EVENT_BASE_H
+#define MDNS_HOST_ESP_EVENT_BASE_H
+
+typedef enum {
+    WIFI_EVENT_STA_CONNECTED,            /**< ESP32 station connected to AP */
+    WIFI_EVENT_STA_DISCONNECTED,         /**< ESP32 station disconnected from AP */
+    WIFI_EVENT_AP_START,                 /**< ESP32 soft-AP start */
+    WIFI_EVENT_AP_STOP,                  /**< ESP32 soft-AP stop */
+    IP_EVENT_STA_GOT_IP,
+    IP_EVENT_GOT_IP6
+} mdns_used_event_t;
+
+#endif //MDNS_HOST_ESP_EVENT_BASE_H

esp_modem/test/host_test/components/esp_netif_linux/CMakeLists.txt

@@ -0,0 +1,3 @@
+idf_component_register(SRCS esp_netif_linux.c
+                       INCLUDE_DIRS include
+                       REQUIRES esp_system_protocols_linux)

esp_modem/test/host_test/components/esp_netif_linux/esp_netif_linux.c

@@ -0,0 +1,68 @@
+//
+// Created by david on 2/7/21.
+//
+#include<stdio.h>
+
+#include "esp_netif.h"
+#include "esp_err.h"
+#include<string.h>	//strlen
+#include<sys/socket.h>
+#include<arpa/inet.h>	//inet_addr
+#include <sys/types.h>
+#include <ifaddrs.h>
+#include <net/if.h>
+
+esp_netif_t *esp_netif_get_handle_from_ifkey(const char *if_key)
+{
+    return NULL;
+}
+
+esp_err_t esp_netif_get_ip_info(esp_netif_t *esp_netif, esp_netif_ip_info_t *ip_info)
+{
+    ESP_IPADDR4_INIT(&ip_info->ip, 1,2,3,4);
+    return ESP_OK;
+}
+
+esp_err_t esp_netif_dhcpc_get_status(esp_netif_t *esp_netif, esp_netif_dhcp_status_t *status)
+{
+    return ESP_OK;
+}
+
+
+esp_err_t esp_netif_get_ip6_linklocal(esp_netif_t *esp_netif, esp_ip6_addr_t *if_ip6)
+{
+
+    struct ifaddrs *addrs, *tmp;
+    getifaddrs(&addrs);
+    tmp = addrs;
+
+    while (tmp)
+    {
+//        if (tmp->ifa_addr && tmp->ifa_addr->sa_family == AF_INET)
+//        {
+//            struct sockaddr_in *pAddr = (struct sockaddr_in *)tmp->ifa_addr;
+//            printf("%s: %s\n", tmp->ifa_name, inet_ntoa(pAddr->sin_addr));
+//        } else
+
+        if (tmp->ifa_addr && tmp->ifa_addr->sa_family == AF_INET6) {
+            char addr[64];
+            struct sockaddr_in6 *pAddr = (struct sockaddr_in6 *)tmp->ifa_addr;
+            inet_ntop(AF_INET6, &pAddr->sin6_addr, addr, sizeof(addr) );
+            printf("%s: %s\n", tmp->ifa_name, addr);
+            inet6_addr_to_ip6addr(if_ip6, &pAddr->sin6_addr);
+        }
+
+        tmp = tmp->ifa_next;
+    }
+
+    freeifaddrs(addrs);
+    return ESP_OK;
+}
+
+int esp_netif_get_netif_impl_index(esp_netif_t *esp_netif)
+{
+    char * ifname = "enp1s0";
+    uint32_t interfaceIndex = if_nametoindex(ifname);
+    printf("%s: %d\n", ifname, interfaceIndex);
+    return interfaceIndex;
+}

esp_modem/test/host_test/components/esp_netif_linux/include/esp_netif.h

@@ -0,0 +1,60 @@
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _HOST_ESP_NETIF_H_
+#define _HOST_ESP_NETIF_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "esp_netif_ip_addr.h"
+#include "esp_err.h"
+#include "esp_event.h"
+
+struct esp_netif_obj {};
+
+typedef struct esp_netif_driver_base_s {
+    esp_err_t (*post_attach)(esp_netif_t *netif, void* h);
+    esp_netif_t *netif;
+} esp_netif_driver_base_t;
+
+struct esp_netif_driver_ifconfig {
+    void* handle;
+    esp_err_t (*transmit)(void *h, void *buffer, size_t len);
+    esp_err_t (*transmit_wrap)(void *h, void *buffer, size_t len, void *netstack_buffer);
+    void (*driver_free_rx_buffer)(void *h, void* buffer);
+};
+
+typedef struct esp_netif_obj esp_netif_t;
+
+/** @brief Status of DHCP client or DHCP server */
+typedef enum {
+    ESP_NETIF_DHCP_INIT = 0,    /**< DHCP client/server is in initial state (not yet started) */
+    ESP_NETIF_DHCP_STARTED,     /**< DHCP client/server has been started */
+    ESP_NETIF_DHCP_STOPPED,     /**< DHCP client/server has been stopped */
+    ESP_NETIF_DHCP_STATUS_MAX
+} esp_netif_dhcp_status_t;
+
+
+esp_netif_t *esp_netif_get_handle_from_ifkey(const char *if_key);
+
+esp_err_t esp_netif_get_ip_info(esp_netif_t *esp_netif, esp_netif_ip_info_t *ip_info);
+
+esp_err_t esp_netif_dhcpc_get_status(esp_netif_t *esp_netif, esp_netif_dhcp_status_t *status);
+
+esp_err_t esp_netif_get_ip6_linklocal(esp_netif_t *esp_netif, esp_ip6_addr_t *if_ip6);
+int esp_netif_get_netif_impl_index(esp_netif_t *esp_netif);
+
+void esp_netif_action_connected(void *esp_netif, esp_event_base_t base, int32_t event_id, void *data);
+void esp_netif_action_disconnected(void *esp_netif, esp_event_base_t base, int32_t event_id, void *data);
+
+#endif // _HOST_ESP_NETIF_H_

esp_modem/test/host_test/components/esp_netif_linux/include/esp_netif_ip_addr.h

@@ -0,0 +1,182 @@
+// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _ESP_NETIF_IP_ADDR_H_
+#define _ESP_NETIF_IP_ADDR_H_
+
+#include <endian.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if BYTE_ORDER == BIG_ENDIAN
+#define esp_netif_htonl(x) ((uint32_t)(x))
+#else
+#define esp_netif_htonl(x) ((((x) & (uint32_t)0x000000ffUL) << 24) | \
+                      (((x) & (uint32_t)0x0000ff00UL) <<  8) | \
+                      (((x) & (uint32_t)0x00ff0000UL) >>  8) | \
+                      (((x) & (uint32_t)0xff000000UL) >> 24))
+#endif
+
+#define esp_netif_ip4_makeu32(a,b,c,d) (((uint32_t)((a) & 0xff) << 24) | \
+                               ((uint32_t)((b) & 0xff) << 16) | \
+                               ((uint32_t)((c) & 0xff) << 8)  | \
+                                (uint32_t)((d) & 0xff))
+
+// Access address in 16-bit block
+#define ESP_IP6_ADDR_BLOCK1(ip6addr) ((uint16_t)((esp_netif_htonl((ip6addr)->addr[0]) >> 16) & 0xffff))
+#define ESP_IP6_ADDR_BLOCK2(ip6addr) ((uint16_t)((esp_netif_htonl((ip6addr)->addr[0])) & 0xffff))
+#define ESP_IP6_ADDR_BLOCK3(ip6addr) ((uint16_t)((esp_netif_htonl((ip6addr)->addr[1]) >> 16) & 0xffff))
+#define ESP_IP6_ADDR_BLOCK4(ip6addr) ((uint16_t)((esp_netif_htonl((ip6addr)->addr[1])) & 0xffff))
+#define ESP_IP6_ADDR_BLOCK5(ip6addr) ((uint16_t)((esp_netif_htonl((ip6addr)->addr[2]) >> 16) & 0xffff))
+#define ESP_IP6_ADDR_BLOCK6(ip6addr) ((uint16_t)((esp_netif_htonl((ip6addr)->addr[2])) & 0xffff))
+#define ESP_IP6_ADDR_BLOCK7(ip6addr) ((uint16_t)((esp_netif_htonl((ip6addr)->addr[3]) >> 16) & 0xffff))
+#define ESP_IP6_ADDR_BLOCK8(ip6addr) ((uint16_t)((esp_netif_htonl((ip6addr)->addr[3])) & 0xffff))
+
+#define IPSTR "%d.%d.%d.%d"
+#define esp_ip4_addr_get_byte(ipaddr, idx) (((const uint8_t*)(&(ipaddr)->addr))[idx])
+#define esp_ip4_addr1(ipaddr) esp_ip4_addr_get_byte(ipaddr, 0)
+#define esp_ip4_addr2(ipaddr) esp_ip4_addr_get_byte(ipaddr, 1)
+#define esp_ip4_addr3(ipaddr) esp_ip4_addr_get_byte(ipaddr, 2)
+#define esp_ip4_addr4(ipaddr) esp_ip4_addr_get_byte(ipaddr, 3)
+
+
+#define esp_ip4_addr1_16(ipaddr) ((uint16_t)esp_ip4_addr1(ipaddr))
+#define esp_ip4_addr2_16(ipaddr) ((uint16_t)esp_ip4_addr2(ipaddr))
+#define esp_ip4_addr3_16(ipaddr) ((uint16_t)esp_ip4_addr3(ipaddr))
+#define esp_ip4_addr4_16(ipaddr) ((uint16_t)esp_ip4_addr4(ipaddr))
+
+#define IP2STR(ipaddr) esp_ip4_addr1_16(ipaddr), \
+    esp_ip4_addr2_16(ipaddr), \
+    esp_ip4_addr3_16(ipaddr), \
+    esp_ip4_addr4_16(ipaddr)
+
+#define IPV6STR "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x"
+
+#define IPV62STR(ipaddr) ESP_IP6_ADDR_BLOCK1(&(ipaddr)),     \
+    ESP_IP6_ADDR_BLOCK2(&(ipaddr)),     \
+    ESP_IP6_ADDR_BLOCK3(&(ipaddr)),     \
+    ESP_IP6_ADDR_BLOCK4(&(ipaddr)),     \
+    ESP_IP6_ADDR_BLOCK5(&(ipaddr)),     \
+    ESP_IP6_ADDR_BLOCK6(&(ipaddr)),     \
+    ESP_IP6_ADDR_BLOCK7(&(ipaddr)),     \
+    ESP_IP6_ADDR_BLOCK8(&(ipaddr))
+
+#define ESP_IPADDR_TYPE_V4                0U
+#define ESP_IPADDR_TYPE_V6                6U
+#define ESP_IPADDR_TYPE_ANY               46U
+
+#define ESP_IP4TOUINT32(a,b,c,d) (((uint32_t)((a) & 0xffU) << 24) | \
+                               ((uint32_t)((b) & 0xffU) << 16) | \
+                               ((uint32_t)((c) & 0xffU) << 8)  | \
+                                (uint32_t)((d) & 0xffU))
+
+#define ESP_IP4TOADDR(a,b,c,d) esp_netif_htonl(ESP_IP4TOUINT32(a, b, c, d))
+
+// new definitions
+#define ESP_IPADDR4_INIT(ipaddr, a,b,c,d)  (ipaddr)->addr = ESP_IP4TOADDR(a,b,c,d)
+#define ESP_IP6TOADDR(a, b, c, d)      { { { { a, b, c, d } , 0 } }, ESP_IPADDR_TYPE_V6 }
+
+// TODO: use esp-netif instead of lwip API
+#define ip_2_ip6(ipaddr)   (&((ipaddr)->u_addr.ip6))
+#define ip_2_ip4(ipaddr)   (&((ipaddr)->u_addr.ip4))
+#define IP_SET_TYPE_VAL(ipaddr, iptype) do { (ipaddr).type = (iptype); }while(0)
+#define IP_GET_TYPE(ipaddr)           ((ipaddr)->type)
+#define IP_IS_V6_VAL(ipaddr)          (IP_GET_TYPE(&ipaddr) == ESP_IPADDR_TYPE_V6)
+#define ip4_addr_copy(dest, src) ((dest).addr = (src).addr)
+#define ip6_addr_copy(dest, src) do{(dest).addr[0] = (src).addr[0]; \
+                                    (dest).addr[1] = (src).addr[1]; \
+                                    (dest).addr[2] = (src).addr[2]; \
+                                    (dest).addr[3] = (src).addr[3];}while(0)
+
+#define ip_addr_copy(dest, src)      do{ IP_SET_TYPE_VAL(dest, IP_GET_TYPE(&src)); if(IP_IS_V6_VAL(src)){ \
+  ip6_addr_copy(*ip_2_ip6(&(dest)), *ip_2_ip6(&(src))); }else{ \
+  ip4_addr_copy(*ip_2_ip4(&(dest)), *ip_2_ip4(&(src))); }}while(0)
+
+
+#define IP_MULTICAST(a)     IN_CLASSD(a)
+
+#define ip6_addr_ismulticast(ip6addr) (((ip6addr)->addr[0] & htonl(0xff000000UL)) == htonl(0xff000000UL))
+#define IP6_NO_ZONE 0
+#define ip6_addr_clear_zone(ip6addr) ((ip6addr)->zone = IP6_NO_ZONE)
+
+#define inet6_addr_from_ip6addr(target_in6addr, source_ip6addr) {(target_in6addr)->s6_addr32[0] = (source_ip6addr)->addr[0]; \
+                                                                 (target_in6addr)->s6_addr32[1] = (source_ip6addr)->addr[1]; \
+                                                                 (target_in6addr)->s6_addr32[2] = (source_ip6addr)->addr[2]; \
+                                                                 (target_in6addr)->s6_addr32[3] = (source_ip6addr)->addr[3];}
+
+#define inet6_addr_to_ip6addr(target_ip6addr, source_in6addr)   {(target_ip6addr)->addr[0] = (source_in6addr)->s6_addr32[0]; \
+                                                                 (target_ip6addr)->addr[1] = (source_in6addr)->s6_addr32[1]; \
+                                                                 (target_ip6addr)->addr[2] = (source_in6addr)->s6_addr32[2]; \
+                                                                 (target_ip6addr)->addr[3] = (source_in6addr)->s6_addr32[3]; \
+                                                                 ip6_addr_clear_zone(target_ip6addr);}
+
+
+struct esp_ip6_addr {
+    uint32_t addr[4];
+    uint8_t zone;
+};
+
+
+
+struct esp_ip4_addr {
+    uint32_t addr;
+};
+
+typedef struct esp_ip4_addr esp_ip4_addr_t;
+
+typedef struct esp_ip6_addr esp_ip6_addr_t;
+
+typedef struct _ip_addr {
+    union {
+        esp_ip6_addr_t ip6;
+        esp_ip4_addr_t ip4;
+    } u_addr;
+    uint8_t type;
+} esp_ip_addr_t;
+
+typedef enum {
+    ESP_IP6_ADDR_IS_UNKNOWN,
+    ESP_IP6_ADDR_IS_GLOBAL,
+    ESP_IP6_ADDR_IS_LINK_LOCAL,
+    ESP_IP6_ADDR_IS_SITE_LOCAL,
+    ESP_IP6_ADDR_IS_UNIQUE_LOCAL,
+    ESP_IP6_ADDR_IS_IPV4_MAPPED_IPV6
+} esp_ip6_addr_type_t;
+
+typedef struct {
+    esp_ip4_addr_t ip;      /**< Interface IPV4 address */
+    esp_ip4_addr_t netmask; /**< Interface IPV4 netmask */
+    esp_ip4_addr_t gw;      /**< Interface IPV4 gateway address */
+} esp_netif_ip_info_t;
+
+typedef struct {
+    esp_ip6_addr_t ip; /**< Interface IPV6 address */
+} esp_netif_ip6_info_t;
+
+/**
+ * @brief  Get the IPv6 address type
+ *
+ * @param[in]  ip6_addr IPv6 type
+ *
+ * @return IPv6 type in form of enum esp_ip6_addr_type_t
+ */
+esp_ip6_addr_type_t esp_netif_ip6_get_addr_type(esp_ip6_addr_t* ip6_addr);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif //_ESP_NETIF_IP_ADDR_H_

esp_modem/test/host_test/components/esp_netif_linux/include/esp_netif_ppp.h

@@ -0,0 +1,22 @@
+// Copyright 2021 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+
+#ifndef _ESP_NETIF_PPP_H_
+#define _ESP_NETIF_PPP_H_
+
+#define NETIF_PP_PHASE_OFFSET 0x100
+
+
+#endif //_ESP_NETIF_PPP_H_

esp_modem/test/host_test/components/esp_system_protocols_linux/CMakeLists.txt

@@ -0,0 +1,2 @@
+idf_component_register(INCLUDE_DIRS include
+                        REQUIRES esp_netif_linux esp_event_mock)

esp_modem/test/host_test/components/esp_system_protocols_linux/include/driver/uart.h

@@ -0,0 +1,6 @@
+#pragma once
+
+typedef int uart_port_t;
+typedef int uart_word_length_t;
+typedef int uart_stop_bits_t;
+typedef int uart_parity_t;

esp_modem/test/host_test/components/esp_system_protocols_linux/include/esp_err.h

@@ -0,0 +1,17 @@
+
+
+#include "esp_system_common_declares.h"
+
+typedef int esp_err_t;
+
+#define ESP_FAIL                    -1
+#define ESP_OK                      0
+
+#define ESP_ERR_NO_MEM              0x101
+#define ESP_ERR_INVALID_ARG         0x102
+#define ESP_ERR_INVALID_STATE       0x103
+#define ESP_ERR_INVALID_SIZE        0x104
+#define ESP_ERR_NOT_FOUND           0x105
+#define ESP_ERR_NOT_SUPPORTED       0x106
+#define ESP_ERR_TIMEOUT             0x107
+#define ESP_ERR_INVALID_RESPONSE    0x

esp_modem/test/host_test/components/esp_system_protocols_linux/include/esp_log.h

@@ -0,0 +1,22 @@
+//
+// Created by david on 2/10/21.
+//
+
+#ifndef MDNS_HOST_ESP_LOG_H
+#define MDNS_HOST_ESP_LOG_H
+
+#include <stdio.h>
+
+#define ESP_LOG_INFO 1
+#define ESP_LOG_BUFFER_HEXDUMP(...)
+
+#define ESP_LOGE(TAG, ...)
+//printf(TAG); printf("ERROR: " __VA_ARGS__); printf("\n")
+#define ESP_LOGW(TAG, ...)
+//printf(TAG); printf("WARN: "__VA_ARGS__); printf("\n")
+#define ESP_LOGI(TAG, ...)
+//printf(TAG); printf("INFO: "__VA_ARGS__); printf("\n")
+#define ESP_LOGD(TAG, ...)
+//printf(TAG); printf("DEBUG: "__VA_ARGS__); printf("\n")
+
+#endif //MDNS_HOST_ESP_LOG_H

esp_modem/test/host_test/components/esp_system_protocols_linux/include/esp_system_common_declares.h

@@ -0,0 +1,13 @@
+//
+// Created by david on 2/17/21.
+//
+
+#ifndef MDNS_HOST_ESP_SYSTEM_COMMON_DECLARES_H
+#define MDNS_HOST_ESP_SYSTEM_COMMON_DECLARES_H
+
+struct esp_netif_obj;
+
+typedef struct esp_netif_obj esp_netif_t;
+
+
+#endif //MDNS_HOST_ESP_SYSTEM_COMMON_DECLARES_H

esp_modem/test/host_test/components/esp_system_protocols_linux/include/machine/endian.h

@@ -0,0 +1,10 @@
+//
+// Created by david on 2/17/21.
+//
+
+#ifndef MDNS_HOST_ENDIAN_H
+#define MDNS_HOST_ENDIAN_H
+
+#include_next "endian.h"
+
+#endif //MDNS_HOST_ENDIAN_H

esp_modem/test/host_test/main/CMakeLists.txt

@@ -0,0 +1,10 @@
+idf_component_register(SRCS "test_modem.cpp"
+                       INCLUDE_DIRS "$ENV{IDF_PATH}/tools/catch"
+                       REQUIRES esp_modem)
+
+set(THREADS_PREFER_PTHREAD_FLAG ON)
+find_package(Threads REQUIRED)
+target_link_libraries(${COMPONENT_LIB}  PRIVATE Threads::Threads)
+
+target_compile_features(${COMPONENT_LIB} PRIVATE cxx_std_17)
+target_compile_definitions(${COMPONENT_LIB} PRIVATE "-DCONFIG_IDF_TARGET_LINUX")

esp_modem/test/host_test/main/test_modem.cpp

@@ -0,0 +1,145 @@
+#define CATCH_CONFIG_MAIN // This tells the catch header to generate a main
+#include <memory>
+#include <future>
+#include "catch.hpp"
+#include "cxx_include/esp_modem_terminal.hpp"
+#include "cxx_include/esp_modem_api.hpp"
+
+using namespace esp_modem;
+
+class LoopbackTerm : public Terminal {
+public:
+    explicit LoopbackTerm(): loopback_data(), data_len(0) {}
+
+    ~LoopbackTerm() override = default;
+
+    void start() override {
+        status = status_t::STARTED;
+    }
+
+    void stop() override {
+        status = status_t::STOPPED;
+    }
+
+    int write(uint8_t *data, size_t len) override {
+        if (len > 2 && (data[len-1] == '\r' || data[len-1] == '+') ) {
+            std::string command((char*)data, len);
+            std::string response;
+            if (command == "ATE1\r" || command == "ATE0\r" || command == "+++") {
+                response = "OK\r\n";
+            } else if (command == "ATO\r") {
+                response = "ERROR\r\n";
+            } else if (command.find("ATD") != std::string::npos) {
+                response = "CONNECT\r\n";
+            } else if (command.find("AT") != std::string::npos) {
+                response = "OK\r\n";
+            }
+            if (!response.empty()) {
+                data_len = response.length();
+                loopback_data.resize(data_len);
+                memcpy(&loopback_data[0], &response[0], data_len);
+                auto ret = std::async(on_data, data_len);
+                return len;
+            }
+        }
+        loopback_data.resize(data_len + len);
+        memcpy(&loopback_data[data_len], data, len);
+        data_len += len;
+        auto ret = std::async(on_data, data_len);
+        return len;
+    }
+
+    int read(uint8_t *data, size_t len) override {
+        size_t read_len = std::min(data_len, len);
+        if (read_len) {
+            memcpy(data, &loopback_data[0], len);
+            loopback_data.erase(loopback_data.begin(), loopback_data.begin() + read_len);
+            data_len -= len;
+        }
+        return read_len;
+    }
+
+    void set_data_cb(std::function<bool(size_t len)> f) override {
+        on_data = std::move(f);
+    }
+
+private:
+    enum class status_t {
+        STARTED,
+        STOPPED
+    };
+    status_t status;
+    signal_group signal;
+    std::vector<uint8_t> loopback_data;
+    size_t data_len;
+};
+
+TEST_CASE("DTE send/receive command", "[esp_modem]")
+{
+    auto term = std::make_unique<LoopbackTerm>();
+    auto dte =  std::make_unique<DTE>(std::move(term));
+
+    const auto test_command = "Test\n";
+    CHECK(term == nullptr);
+
+    dte->set_mode(esp_modem::modem_mode::COMMAND_MODE);
+
+    auto ret = dte->command(test_command, [&](uint8_t *data, size_t len) {
+        std::string response((char*)data, len);
+        CHECK(response == test_command);
+        return command_result::OK;
+    }, 1000);
+    CHECK(ret == command_result::OK);
+}
+
+TEST_CASE("DCE commands", "[esp_modem]")
+{
+    auto term = std::make_unique<LoopbackTerm>();
+    auto dte =  std::make_shared<DTE>(std::move(term));
+    CHECK(term == nullptr);
+
+    esp_modem_dce_config_t dce_config = ESP_MODEM_DCE_DEFAULT_CONFIG("APN");
+    esp_netif_t netif{};
+    auto dce = create_SIM7600_dce(&dce_config, dte, &netif);
+    CHECK(dce != nullptr);
+
+    const auto test_command = "Test\n";
+    auto ret = dce->command(test_command, [&](uint8_t *data, size_t len) {
+        std::string response((char*)data, len);
+        CHECK(response == test_command);
+        return command_result::OK;
+    }, 1000);
+    CHECK(ret == command_result::OK);
+}
+
+TEST_CASE("DCE AT commands", "[esp_modem]")
+{
+    auto term = std::make_unique<LoopbackTerm>();
+    auto dte =  std::make_shared<DTE>(std::move(term));
+    CHECK(term == nullptr);
+
+    esp_modem_dce_config_t dce_config = ESP_MODEM_DCE_DEFAULT_CONFIG("APN");
+    esp_netif_t netif{};
+    auto dce = create_SIM7600_dce(&dce_config, dte, &netif);
+    CHECK(dce != nullptr);
+
+    CHECK(dce->set_echo(false) == command_result::OK);
+    CHECK(dce->set_echo(true) == command_result::OK);
+    CHECK(dce->resume_data_mode() == command_result::FAIL);
+}
+
+TEST_CASE("DCE modes", "[esp_modem]")
+{
+    auto term = std::make_unique<LoopbackTerm>();
+    auto dte =  std::make_shared<DTE>(std::move(term));
+    CHECK(term == nullptr);
+
+    esp_modem_dce_config_t dce_config = ESP_MODEM_DCE_DEFAULT_CONFIG("APN");
+    esp_netif_t netif{};
+    auto dce = create_SIM7600_dce(&dce_config, dte, &netif);
+    CHECK(dce != nullptr);
+
+    CHECK(dce->set_mode(esp_modem::modem_mode::COMMAND_MODE) == false);
+    CHECK(dce->set_mode(esp_modem::modem_mode::DATA_MODE) == true);
+    CHECK(dce->set_mode(esp_modem::modem_mode::COMMAND_MODE) == true);
+}

esp_modem/test/host_test/sdkconfig.defaults

@@ -0,0 +1,5 @@
+CONFIG_IDF_TARGET="linux"
+CONFIG_COMPILER_CXX_EXCEPTIONS=y
+CONFIG_COMPILER_CXX_RTTI=y
+CONFIG_COMPILER_CXX_EXCEPTIONS_EMG_POOL_SIZE=0
+CONFIG_COMPILER_STACK_CHECK_NONE=y

esp_modem/test/target/CMakeLists.txt

@@ -0,0 +1,8 @@
+# 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 "../..")
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(pppd_test)

esp_modem/test/target/main/CMakeLists.txt

@@ -0,0 +1,6 @@
+idf_component_register(SRCS "pppd_test.cpp"
+                            "NetworkDCE.cpp"
+        INCLUDE_DIRS "$ENV{IDF_PATH}/tools/catch"
+        REQUIRES esp_modem)
+
+target_compile_features(${COMPONENT_LIB} PRIVATE cxx_std_17)

esp_modem/test/target/main/Kconfig.projbuild

@@ -0,0 +1,26 @@
+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_WIFI_CHANNEL
+        int "WiFi Channel"
+        range 1 13
+        default 1
+        help
+            WiFi channel (network channel) for the example to use.
+
+    config ESP_MAX_STA_CONN
+        int "Maximal STA connections"
+        default 4
+        help
+            Max number of the STA connects to AP.
+endmenu

esp_modem/test/target/main/NetworkDCE.cpp

@@ -0,0 +1,78 @@
+//
+// Created by david on 3/25/21.
+//
+#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;
+
+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< /* Object to create */ DCE_T<T>, /* vanilla pointer */ DCE_T<T> *, /* module */ T>
+                (cfg, std::forward<Args>(args)...);
+    }
+};
+
+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();
+        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;
+
+esp_err_t modem_init_network(esp_netif_t *netif)
+{
+    return NetModule::init(netif);
+}
+
+void modem_start_network()
+{
+    NetModule::start();
+}
+
+void modem_stop_network()
+{
+    NetModule::stop();
+}

esp_modem/test/target/main/pppd_test.cpp

@@ -0,0 +1,125 @@
+#include <string.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"
+
+#define CATCH_CONFIG_MAIN
+#include "catch.hpp"
+
+static const char *TAG = "pppd_test";
+static EventGroupHandle_t event_group = NULL;
+
+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! %d", 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, 1);
+        } 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 %d", event_id);
+    if (event_id == NETIF_PPP_ERRORUSER) {
+        /* User interrupted event from esp-netif */
+        esp_netif_t *netif = static_cast<esp_netif_t *>(event_data);
+        ESP_LOGI(TAG, "User interrupted event from netif:%p", netif);
+        xEventGroupSetBits(event_group, 2);
+    }
+}
+
+
+
+esp_err_t modem_init_network(esp_netif_t *netif);
+void modem_start_network();
+void modem_stop_network();
+
+extern "C" void app_main(void)
+{
+
+    ESP_ERROR_CHECK(esp_netif_init());
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+    event_group = xEventGroupCreate();
+
+    // init the DTE
+    esp_netif_config_t ppp_netif_config = ESP_NETIF_DEFAULT_PPP();
+    esp_netif_t *ppp_netif = esp_netif_new(&ppp_netif_config);
+    assert(ppp_netif);
+    esp_netif_ppp_config_t ppp_config = { true, true };
+    esp_netif_ppp_set_params(ppp_netif, &ppp_config);
+
+    ESP_ERROR_CHECK(modem_init_network(ppp_netif));
+    ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, ESP_EVENT_ANY_ID, on_modem_event, nullptr));
+    ESP_ERROR_CHECK(esp_event_handler_register(NETIF_PPP_STATUS, ESP_EVENT_ANY_ID, &on_ppp_changed, nullptr));
+
+    modem_start_network();
+    Catch::Session session;
+    int numFailed = session.run();
+    if (numFailed > 0) {
+        ESP_LOGE(TAG, "Test FAILED!");
+    } else {
+        ESP_LOGI(TAG, "Test passed!");
+    }
+
+}
+
+TEST_CASE("Connect test", "[esp_modem]")
+{
+    EventBits_t b = xEventGroupWaitBits(event_group, 1, pdTRUE, pdFALSE, pdMS_TO_TICKS(15000));
+    CHECK(b == 1);
+}
+
+TEST_CASE("Disconnection test", "[esp_modem]")
+{
+    modem_stop_network();
+    EventBits_t b = xEventGroupWaitBits(event_group, 2, pdTRUE, pdFALSE, pdMS_TO_TICKS(15000));
+    CHECK(b == 2);
+}
+
+
+extern "C" {
+
+static void handle(int nr)
+{
+    ESP_LOGE(TAG, "Signal handler %d", nr);
+}
+
+_sig_func_ptr signal (int nr, _sig_func_ptr)
+{
+    return handle;
+}
+
+
+}