feat(modem): Add mode detection to the example

components/esp_modem/examples/pppos_client/main/pppos_client_main.c

@@ -177,7 +177,7 @@ void app_main(void)
     dte_config.uart_config.rx_buffer_size = CONFIG_EXAMPLE_MODEM_UART_RX_BUFFER_SIZE;
     dte_config.uart_config.tx_buffer_size = CONFIG_EXAMPLE_MODEM_UART_TX_BUFFER_SIZE;
     dte_config.uart_config.event_queue_size = CONFIG_EXAMPLE_MODEM_UART_EVENT_QUEUE_SIZE;
-    dte_config.task_stack_size = CONFIG_EXAMPLE_MODEM_UART_EVENT_TASK_STACK_SIZE;
+    dte_config.task_stack_size = CONFIG_EXAMPLE_MODEM_UART_EVENT_TASK_STACK_SIZE * 2;
     dte_config.task_priority = CONFIG_EXAMPLE_MODEM_UART_EVENT_TASK_PRIORITY;
     dte_config.dte_buffer_size = CONFIG_EXAMPLE_MODEM_UART_RX_BUFFER_SIZE / 2;
 
@@ -248,6 +248,22 @@ void app_main(void)
 
     xEventGroupClearBits(event_group, CONNECT_BIT | GOT_DATA_BIT | USB_DISCONNECTED_BIT);
 
+    esp_err_t err = esp_modem_set_mode(dce, ESP_MODEM_MODE_DETECT);
+    if (err != ESP_OK) {
+        ESP_LOGE(TAG, "esp_modem_set_mode(ESP_MODEM_MODE_DETECT) failed with %d", err);
+        return;
+    }
+    ESP_LOGI(TAG, "Mode detected!");
+    esp_modem_dce_mode_t mode = esp_modem_get_mode(dce);
+    ESP_LOGI(TAG, "Current mode is : %d", mode);
+    if (mode != ESP_MODEM_MODE_COMMAND) {
+        err = esp_modem_set_mode(dce, ESP_MODEM_MODE_COMMAND);
+        if (err != ESP_OK) {
+            ESP_LOGE(TAG, "esp_modem_set_mode(ESP_MODEM_MODE_COMMAND) failed with %d", err);
+            return;
+        }
+    }
+
     /* Run the modem demo app */
 #if CONFIG_EXAMPLE_NEED_SIM_PIN == 1
     // check if PIN needed
@@ -262,7 +278,7 @@ void app_main(void)
 #endif
 
     int rssi, ber;
-    esp_err_t err = esp_modem_get_signal_quality(dce, &rssi, &ber);
+    err = esp_modem_get_signal_quality(dce, &rssi, &ber);
     if (err != ESP_OK) {
         ESP_LOGE(TAG, "esp_modem_get_signal_quality failed with %d %s", err, esp_err_to_name(err));
         return;

components/esp_modem/examples/pppos_client/sdkconfig.ci.sim800_c3

@@ -14,3 +14,4 @@ CONFIG_EXAMPLE_MQTT_TEST_TOPIC="/ci/esp-modem/pppos-client"
 CONFIG_EXAMPLE_PAUSE_NETIF_TO_CHECK_SIGNAL=y
 CONFIG_ESP_SYSTEM_PANIC_PRINT_HALT=y
 CONFIG_ESP32_PANIC_PRINT_HALT=y
+CONFIG_LOG_DEFAULT_LEVEL_DEBUG=y

components/esp_modem/include/cxx_include/esp_modem_dce.hpp

@@ -91,6 +91,11 @@ class DCE_T {
         return mode.set(dte.get(), device.get(), netif, m);
     }
 
+    modem_mode get_mode()
+    {
+        return mode.get();
+    }
+
     bool recover()
     {
         return dte->recover();
@@ -109,11 +114,12 @@ class DCE_T {
      * @param force true to ignore command failures and continue
      * @return command_result of the underlying commands
      */
-    command_result pause_netif(bool do_pause, bool force = false)
+    command_result pause_netif(bool do_pause, bool force = false, int delay = 1000)
     {
         command_result result;
         if (do_pause) {
             netif.pause();
+            Task::Delay(delay); // Mandatory 1s pause before
             dte->set_command_callbacks();
             result = device->set_command_mode();
         } else {

components/esp_modem/include/esp_modem_c_api_types.h

@@ -45,6 +45,8 @@ typedef enum esp_modem_dce_mode {
     ESP_MODEM_MODE_CMUX_MANUAL_SWAP,    /**< Swap terminals in CMUX manual mode */
     ESP_MODEM_MODE_CMUX_MANUAL_DATA,    /**< Set DATA mode in CMUX manual mode */
     ESP_MODEM_MODE_CMUX_MANUAL_COMMAND, /**< Set COMMAND mode in CMUX manual mode */
+    ESP_MODEM_MODE_DETECT,              /**< Detect the mode and resume it (if sucessfully detected) */
+    ESP_MODEM_MODE_UNDEF,
 } esp_modem_dce_mode_t;
 
 /**
@@ -171,6 +173,7 @@ esp_err_t esp_modem_set_urc(esp_modem_dce_t *dce, esp_err_t(*got_line_cb)(uint8_
  */
 esp_err_t esp_modem_pause_net(esp_modem_dce_t *dce, bool pause);
 
+esp_modem_dce_mode_t esp_modem_get_mode(esp_modem_dce_t *dce);
 /**
  * @}
  */

components/esp_modem/src/esp_modem_c_api.cpp

@@ -95,12 +95,43 @@ extern "C" esp_err_t esp_modem_sync(esp_modem_dce_t *dce_wrap)
     return command_response_to_esp_err(dce_wrap->dce->sync());
 }
 
+extern "C" esp_modem_dce_mode_t esp_modem_get_mode(esp_modem_dce_t *dce_wrap)
+{
+    if (dce_wrap == nullptr || dce_wrap->dce == nullptr) {
+        return ESP_MODEM_MODE_UNDEF;
+    }
+    auto mode = dce_wrap->dce->get_mode();
+    switch (mode) {
+    default:
+    case modem_mode::UNDEF:
+        return ESP_MODEM_MODE_UNDEF;
+    case modem_mode::COMMAND_MODE:
+        return ESP_MODEM_MODE_COMMAND;
+    case modem_mode::DATA_MODE:
+        return ESP_MODEM_MODE_DATA;
+    case modem_mode::CMUX_MODE:
+        return ESP_MODEM_MODE_CMUX;
+    case modem_mode::CMUX_MANUAL_MODE:
+        return ESP_MODEM_MODE_CMUX_MANUAL;
+    case modem_mode::CMUX_MANUAL_EXIT:
+        return ESP_MODEM_MODE_CMUX_MANUAL_EXIT;
+    case modem_mode::CMUX_MANUAL_DATA:
+        return ESP_MODEM_MODE_CMUX_MANUAL_DATA;
+    case modem_mode::CMUX_MANUAL_COMMAND:
+        return ESP_MODEM_MODE_CMUX_MANUAL_COMMAND;
+    case modem_mode::CMUX_MANUAL_SWAP:
+        return ESP_MODEM_MODE_CMUX_MANUAL_SWAP;
+    }
+}
+
 extern "C" esp_err_t esp_modem_set_mode(esp_modem_dce_t *dce_wrap, esp_modem_dce_mode_t mode)
 {
     if (dce_wrap == nullptr || dce_wrap->dce == nullptr) {
         return ESP_ERR_INVALID_ARG;
     }
     switch (mode) {
+    case ESP_MODEM_MODE_UNDEF:
+        return dce_wrap->dce->set_mode(modem_mode::UNDEF) ? ESP_OK : ESP_FAIL;
     case ESP_MODEM_MODE_DATA:
         return dce_wrap->dce->set_mode(modem_mode::DATA_MODE) ? ESP_OK : ESP_FAIL;
     case ESP_MODEM_MODE_COMMAND:
@@ -117,6 +148,8 @@ extern "C" esp_err_t esp_modem_set_mode(esp_modem_dce_t *dce_wrap, esp_modem_dce
         return dce_wrap->dce->set_mode(modem_mode::CMUX_MANUAL_DATA) ? ESP_OK : ESP_FAIL;
     case ESP_MODEM_MODE_CMUX_MANUAL_COMMAND:
         return dce_wrap->dce->set_mode(modem_mode::CMUX_MANUAL_COMMAND) ? ESP_OK : ESP_FAIL;
+    case ESP_MODEM_MODE_DETECT:
+        return dce_wrap->dce->set_mode(modem_mode::AUTODETECT) ? ESP_OK : ESP_FAIL;
     }
     return ESP_ERR_NOT_SUPPORTED;
 }