feat(examples): Add support for lwip build under linux

common_components/linux_compat/esp_timer/esp_timer_linux.c

@@ -7,6 +7,7 @@
 #include "esp_timer.h"
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
+#include <pthread.h>
 
 void *create_tt(esp_timer_cb_t cb);
 
@@ -37,3 +38,10 @@ esp_err_t esp_timer_delete(esp_timer_handle_t timer)
     destroy_tt(timer);
     return ESP_OK;
 }
+
+int64_t esp_timer_get_time(void)
+{
+    struct timespec spec;
+    clock_gettime(CLOCK_REALTIME, &spec);
+    return spec.tv_nsec / 1000 + spec.tv_sec * 1000000;
+}

common_components/linux_compat/esp_timer/include/esp_timer.h

@@ -32,3 +32,5 @@ esp_err_t esp_timer_start_periodic(esp_timer_handle_t timer, uint64_t period);
 esp_err_t esp_timer_stop(esp_timer_handle_t timer);
 
 esp_err_t esp_timer_delete(esp_timer_handle_t timer);
+
+int64_t esp_timer_get_time(void);

common_components/linux_compat/freertos/include/freertos/task.h

@@ -7,6 +7,10 @@
 
 #include "freertos/FreeRTOS.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define TaskHandle_t TaskHandle_t
 #define vSemaphoreDelete( xSemaphore ) vQueueDelete( ( QueueHandle_t ) ( xSemaphore ) )
 
@@ -73,3 +77,7 @@ EventBits_t xEventGroupSetBits( EventGroupHandle_t xEventGroup,
                                 const EventBits_t uxBitsToSet );
 
 uint32_t xQueueSendToBack(QueueHandle_t xQueue, const void *pvItemToQueue, TickType_t xTicksToWait );
+
+#ifdef __cplusplus
+}
+#endif //__cplusplus

components/mdns/CMakeLists.txt

@@ -6,7 +6,7 @@ endif()
 
 idf_build_get_property(target IDF_TARGET)
 if(${target} STREQUAL "linux")
-    set(dependencies esp_netif_linux esp_timer_linux esp_system)
+    set(dependencies esp_netif_linux esp_timer esp_system)
     set(srcs "mdns.c" ${MDNS_NETWORKING})
 else()
     set(dependencies lwip console esp_netif)

components/mdns/tests/host_test/CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.5)
 
-set(EXTRA_COMPONENT_DIRS "../.. ../../../../common_components/linux_compat/freertos")
+set(EXTRA_COMPONENT_DIRS "../.." "../../../../common_components/linux_compat")
 
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 set(COMPONENTS main esp_netif_linux)

examples/mqtt/CMakeLists.txt

@@ -7,11 +7,18 @@ cmake_minimum_required(VERSION 3.16)
 set(EXTRA_COMPONENT_DIRS $ENV{IDF_PATH}/examples/common_components/protocol_examples_common)
 
 if(${IDF_TARGET} STREQUAL "linux")
-    list(APPEND EXTRA_COMPONENT_DIRS "../../common_components/linux_compat/freertos"
-            "$ENV{IDF_PATH}/examples/protocols/linux_stubs/esp_stubs")
-    set(COMPONENTS main nvs_flash)
+    if(WITH_LWIP STREQUAL 1)
+        set(EXTRA_COMPONENT_DIRS $ENV{IDF_PATH}/examples/common_components/protocol_examples_tapif_io
+                                 "../../common_components/linux_compat/esp_timer")
+        set(COMPONENTS main esp_netif lwip protocol_examples_tapif_io startup esp_hw_support esp_system nvs_flash mqtt esp_timer)
+    else()
+        list(APPEND EXTRA_COMPONENT_DIRS
+                "../../common_components/linux_compat/freertos"
+                "../../common_components/linux_compat/esp_timer"
+                "$ENV{IDF_PATH}/examples/protocols/linux_stubs/esp_stubs")
+        set(COMPONENTS main nvs_flash esp-tls esp_stubs mqtt protocol_examples_common esp_timer)
+    endif()
 endif()
 
-
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
 project(mqtt_tcp)

examples/mqtt/main/CMakeLists.txt

@@ -1,8 +1,10 @@
-set(requires "")
-if(${IDF_TARGET} STREQUAL "linux")
-    list(APPEND requires esp_stubs esp-tls protocol_examples_common mqtt)
-endif()
-idf_component_register(SRCS "app_main.c"
-                    INCLUDE_DIRS "."
-                    REQUIRES ${requires})
+idf_component_register(SRCS "app_main.cpp"
+                    INCLUDE_DIRS ".")
+
 target_compile_options(${COMPONENT_LIB} PRIVATE "-Wno-format")
+
+if(${IDF_TARGET} STREQUAL "linux")
+    if(WITH_LWIP STREQUAL "1")
+        target_compile_definitions(${COMPONENT_LIB} PUBLIC WITH_LWIP)
+    endif()
+endif()

examples/mqtt/main/app_main.cpp

@@ -3,7 +3,6 @@
  *
  * SPDX-License-Identifier: Unlicense OR CC0-1.0
  */
-
 #include <stdio.h>
 #include <stdint.h>
 #include <stddef.h>
@@ -44,7 +43,7 @@ static void log_error_if_nonzero(const char *message, int error_code)
 static void mqtt_event_handler(void *handler_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=%d", base, event_id);
-    esp_mqtt_event_handle_t event = event_data;
+    esp_mqtt_event_handle_t event = (esp_mqtt_event_handle_t)event_data;
     esp_mqtt_client_handle_t client = event->client;
     int msg_id;
     switch ((esp_mqtt_event_id_t)event_id) {
@@ -100,17 +99,20 @@ static void mqtt_event_handler(void *handler_args, esp_event_base_t base, int32_
 
 static void mqtt_app_start(void)
 {
-    esp_mqtt_client_config_t mqtt_cfg = {
-        .broker.address.uri = CONFIG_BROKER_URL,
-    };
+    esp_mqtt_client_config_t mqtt_cfg = {};
+    mqtt_cfg.broker.address.uri = CONFIG_BROKER_URL;
+    mqtt_cfg.credentials.client_id = "idf_on_linux_client";
 
     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_register_event(client, (esp_mqtt_event_id_t)ESP_EVENT_ANY_ID, mqtt_event_handler, NULL);
     esp_mqtt_client_start(client);
 }
 
-void app_main(void)
+#include "esp_netif.h"
+#include "netdb.h"
+
+extern "C" void app_main(void)
 {
     ESP_LOGI(TAG, "[APP] Startup..");
     ESP_LOGI(TAG, "[APP] Free memory: %d bytes", esp_get_free_heap_size());
@@ -133,7 +135,13 @@ void app_main(void)
      * examples/protocols/README.md for more information about this function.
      */
     ESP_ERROR_CHECK(example_connect());
+#if CONFIG_IDF_TARGET_LINUX && WITH_LWIP
+    esp_netif_dns_info_t dns;
+    dns.ip.u_addr.ip4.addr = ipaddr_addr("8.8.8.8");
+    dns.ip.type = IPADDR_TYPE_V4;
+    ESP_ERROR_CHECK(esp_netif_set_dns_info(esp_netif_get_handle_from_ifkey("TAP"), ESP_NETIF_DNS_MAIN, &dns));
+#endif
 
     mqtt_app_start();
-    vTaskDelay(pdMS_TO_TICKS(100000));
+    vTaskDelay(pdMS_TO_TICKS(1000));
 }