fix(modem): Add support for ESP-AT based tcp-client example

Author: david-cermak

components/esp_modem/examples/modem_tcp_client/main/CMakeLists.txt

@@ -1,7 +1,11 @@
+set(module_dir "generic_module")
 if (CONFIG_EXAMPLE_MODEM_DEVICE_BG96)
     set(device_srcs sock_commands_bg96.cpp)
 elseif(CONFIG_EXAMPLE_MODEM_DEVICE_SIM7600)
     set(device_srcs sock_commands_sim7600.cpp)
+elseif(CONFIG_EXAMPLE_MODEM_DEVICE_ESPAT)
+    set(device_srcs sock_commands_espat.cpp)
+    set(module_dir "espat_module")
 endif()
 
 if(CONFIG_ESP_MODEM_ENABLE_DEVELOPMENT_MODE)
@@ -14,4 +18,4 @@ idf_component_register(SRCS "modem_client.cpp"
                             "${command_dir}/sock_dce.cpp"
                             "tcp_transport_at.cpp"
                             "${device_srcs}"
-                       INCLUDE_DIRS "." "${command_dir}")
+                       INCLUDE_DIRS "." "${command_dir}" "${module_dir}")

components/esp_modem/examples/modem_tcp_client/main/Kconfig.projbuild

@@ -18,8 +18,26 @@ menu "Example Configuration"
             bool "SIM7600"
             help
                 SIM7600 is Multi-Band LTE-TDD/LTE-FDD/HSPA+ and GSM/GPRS/EDGE module
+        config EXAMPLE_MODEM_DEVICE_ESPAT
+            bool "ESP-AT"
+            help
+                ESP-AT firmware for ESP32 modules with WiFi connectivity
     endchoice
 
+    if EXAMPLE_MODEM_DEVICE_ESPAT
+        config EXAMPLE_WIFI_SSID
+            string "WiFi SSID"
+            default "myssid"
+            help
+                SSID (network name) to connect to.
+
+        config EXAMPLE_WIFI_PASSWORD
+            string "WiFi Password"
+            default "mypassword"
+            help
+                WiFi password (WPA or WPA2).
+    endif
+
     config EXAMPLE_MODEM_APN
         string "Set MODEM APN"
         default "internet"

components/esp_modem/examples/modem_tcp_client/main/command/sock_dce.hpp

@@ -8,6 +8,7 @@
 #include "cxx_include/esp_modem_api.hpp"
 #include <cxx_include/esp_modem_dce_factory.hpp>
 #include "sock_commands.hpp"
+#include "sock_module.hpp"
 #include <sys/socket.h>
 
 #pragma  once
@@ -97,8 +98,8 @@ class Responder {
     std::shared_ptr<esp_modem::DTE> &dte;
 };
 
-class DCE : public ::esp_modem::GenericModule {
-    using esp_modem::GenericModule::GenericModule;
+class DCE : public Module {
+    using Module::Module;
 public:
 
     /**

components/esp_modem/examples/modem_tcp_client/main/espat_module/sock_module.hpp

@@ -0,0 +1,24 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "esp_modem_config.h"
+#include "cxx_include/esp_modem_api.hpp"
+
+#pragma  once
+
+namespace sock_dce {
+
+class Module: public esp_modem::GenericModule {
+    using esp_modem::GenericModule::GenericModule;
+public:
+
+    esp_modem::command_result sync() override;
+    esp_modem::command_result set_echo(bool on) override;
+    esp_modem::command_result set_pdp_context(esp_modem::PdpContext &pdp) override;
+
+};
+
+}

components/esp_modem/examples/modem_tcp_client/main/generate/sock_dce.hpp

@@ -8,6 +8,7 @@
 #include "cxx_include/esp_modem_api.hpp"
 #include <cxx_include/esp_modem_dce_factory.hpp>
 #include "sock_commands.hpp"
+#include "sock_module.hpp"
 #include <sys/socket.h>
 
 #pragma  once
@@ -97,8 +98,8 @@ class Responder {
     std::shared_ptr<esp_modem::DTE> &dte;
 };
 
-class DCE : public ::esp_modem::GenericModule {
-    using esp_modem::GenericModule::GenericModule;
+class DCE : public Module {
+    using Module::Module;
 public:
 
 //  --- ESP-MODEM command module starts here ---

components/esp_modem/examples/modem_tcp_client/main/generic_module/sock_module.hpp

@@ -0,0 +1,16 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "esp_modem_config.h"
+#include "cxx_include/esp_modem_api.hpp"
+
+#pragma  once
+
+namespace sock_dce {
+
+using Module = esp_modem::GenericModule;
+
+}

components/esp_modem/examples/modem_tcp_client/main/modem_client.cpp

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2023-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Unlicense OR CC0-1.0
  */
@@ -23,8 +23,8 @@
 #include "tcp_transport_mbedtls.h"
 #include "tcp_transport_at.h"
 
-#define BROKER_URL "mqtt.eclipseprojects.io"
-#define BROKER_PORT 8883
+#define BROKER_URL "test.mosquitto.org"
+#define BROKER_PORT 1883
 
 
 static const char *TAG = "modem_client";
@@ -114,7 +114,7 @@ extern "C" void app_main(void)
     mqtt_config.broker.address.port = BROKER_PORT;
     mqtt_config.session.message_retransmit_timeout = 10000;
 #ifndef CONFIG_EXAMPLE_CUSTOM_TCP_TRANSPORT
-    mqtt_config.broker.address.uri = "mqtts://127.0.0.1";
+    mqtt_config.broker.address.uri = "mqtt://127.0.0.1";
     dce->start_listening(BROKER_PORT);
 #else
     mqtt_config.broker.address.uri = "mqtt://" BROKER_URL;
@@ -124,14 +124,14 @@ extern "C" void app_main(void)
     mqtt_config.network.transport = ssl;
 #endif
     esp_mqtt_client_handle_t mqtt_client = esp_mqtt_client_init(&mqtt_config);
-    esp_mqtt_client_register_event(mqtt_client, static_cast<esp_mqtt_event_id_t>(ESP_EVENT_ANY_ID), mqtt_event_handler, NULL);
+    esp_mqtt_client_register_event(mqtt_client, static_cast<esp_mqtt_event_id_t>(ESP_EVENT_ANY_ID), mqtt_event_handler, nullptr);
     esp_mqtt_client_start(mqtt_client);
 #ifndef CONFIG_EXAMPLE_CUSTOM_TCP_TRANSPORT
     if (!dce->connect(BROKER_URL, BROKER_PORT)) {
         ESP_LOGE(TAG, "Failed to start DCE");
         return;
     }
-    while (1) {
+    while (true) {
         while (dce->perform_sock()) {
             ESP_LOGV(TAG, "...performing");
         }