Add simple-esp32 ESP IDF example project.

.github/workflows/build_esp_idf.yml

@@ -0,0 +1,20 @@
+name: Build simple-esp32 with ESP IDF
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: 'recursive'
+          path: ${{ github.workspace }}/app
+
+      - name: esp-idf build
+        uses: espressif/esp-idf-ci-action@v1
+        with:
+          esp_idf_version: v4.4.6
+          target: esp32
+          path: app/examples/simple-esp32-idf

.gitmodules

@@ -0,0 +1,10 @@
+[submodule "examples/simple-esp32-idf/components/arduino-esp32"]
+	path = examples/simple-esp32-idf/components/arduino-esp32
+	url = https://github.com/espressif/arduino-esp32
+	branch = idf-release/v4.4
+[submodule "examples/simple-esp32-idf/components/AsyncTCP"]
+	path = examples/simple-esp32-idf/components/AsyncTCP
+	url = https://github.com/me-no-dev/AsyncTCP
+[submodule "examples/simple-esp32-idf/components/espMqttClient"]
+	path = examples/simple-esp32-idf/components/espMqttClient
+	url = https://github.com/bertmelis/espMqttClient

README.md

@@ -4,6 +4,7 @@ MQTT client library for the Espressif devices ESP8266 and ESP32 on the Arduino f
 Aims to be a non-blocking, fully compliant MQTT 3.1.1 client.
 
 ![platformio](https://github.com/bertmelis/espMqttClient/actions/workflows/build_platformio.yml/badge.svg)
+![ESP IDF Simple ESP32](https://github.com/bertmelis/espMqttClient/actions/workflows/build_esp_idf.yml/badge.svg)
 ![cpplint](https://github.com/bertmelis/espMqttClient/actions/workflows/cpplint.yml/badge.svg)
 ![cppcheck](https://github.com/bertmelis/espMqttClient/actions/workflows/cppcheck.yml/badge.svg)
 [![PlatformIO Registry](https://badges.registry.platformio.org/packages/bertmelis/library/espMqttClient.svg)](https://registry.platformio.org/libraries/bertmelis/espMqttClient)
@@ -18,7 +19,7 @@ Aims to be a non-blocking, fully compliant MQTT 3.1.1 client.
 - Fully async clients available via [AsyncTCP](https://github.com/me-no-dev/AsyncTCP) or [ESPAsnycTCP](https://github.com/me-no-dev/ESPAsyncTCP) (no TLS supported)
 - Supported platforms:
   - Espressif ESP8266 and ESP32 using the Arduino framework
-  - Espressif ESP32 using the ESP IDF
+  - Espressif ESP32 using the ESP IDF, see [esp idf component](https://docs.espressif.com/projects/arduino-esp32/en/latest/esp-idf_component.html)
 - Basic Linux compatibility*. This includes WSL on Windows
 
     > Linux compatibility is mainly for automatic testing. It relies on a quick and dirty Arduino-style `Client` with a POSIX TCP client underneath and Arduino-style `ClientPosixIPAddress` class. These are lacking many features needed for proper Linux support.

examples/simple-esp32-idf/CMakeLists.txt

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+# The following 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(SDKCONFIG ${CMAKE_BINARY_DIR}/sdkconfig)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(simple-esp32-idf)

examples/simple-esp32-idf/main/CMakeLists.txt

@@ -0,0 +1,3 @@
+idf_component_register(
+    SRCS "main.cpp"
+    INCLUDE_DIRS "")

examples/simple-esp32-idf/main/main.cpp

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+#include <Arduino.h>
+#include <WiFi.h>
+
+#include <espMqttClient.h>
+
+#define WIFI_SSID "yourSSID"
+#define WIFI_PASSWORD "yourpass"
+
+#define MQTT_HOST IPAddress(192, 168, 1, 10)
+#define MQTT_PORT 1883
+
+espMqttClient mqttClient;
+bool reconnectMqtt = false;
+uint32_t lastReconnect = 0;
+
+void connectToWiFi() {
+  Serial.println("Connecting to Wi-Fi...");
+  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
+}
+
+void connectToMqtt() {
+  Serial.println("Connecting to MQTT...");
+  if (!mqttClient.connect()) {
+    reconnectMqtt = true;
+    lastReconnect = millis();
+    Serial.println("Connecting failed.");
+  } else {
+    reconnectMqtt = false;
+  }
+}
+
+void WiFiEvent(WiFiEvent_t event) {
+  Serial.printf("[WiFi-event] event: %d\n", event);
+  switch(event) {
+  case SYSTEM_EVENT_STA_GOT_IP:
+    Serial.println("WiFi connected");
+    Serial.println("IP address: ");
+    Serial.println(WiFi.localIP());
+    connectToMqtt();
+    break;
+  case SYSTEM_EVENT_STA_DISCONNECTED:
+    Serial.println("WiFi lost connection");
+    break;
+  default:
+    break;
+  }
+}
+
+void onMqttConnect(bool sessionPresent) {
+  Serial.println("Connected to MQTT.");
+  Serial.print("Session present: ");
+  Serial.println(sessionPresent);
+  uint16_t packetIdSub = mqttClient.subscribe("foo/bar", 2);
+  Serial.print("Subscribing at QoS 2, packetId: ");
+  Serial.println(packetIdSub);
+  mqttClient.publish("foo/bar", 0, true, "test 1");
+  Serial.println("Publishing at QoS 0");
+  uint16_t packetIdPub1 = mqttClient.publish("foo/bar", 1, true, "test 2");
+  Serial.print("Publishing at QoS 1, packetId: ");
+  Serial.println(packetIdPub1);
+  uint16_t packetIdPub2 = mqttClient.publish("foo/bar", 2, true, "test 3");
+  Serial.print("Publishing at QoS 2, packetId: ");
+  Serial.println(packetIdPub2);
+}
+
+void onMqttDisconnect(espMqttClientTypes::DisconnectReason reason) {
+  Serial.printf("Disconnected from MQTT: %u.\n", static_cast<uint8_t>(reason));
+
+  if (WiFi.isConnected()) {
+    reconnectMqtt = true;
+    lastReconnect = millis();
+  }
+}
+
+void onMqttSubscribe(uint16_t packetId, const espMqttClientTypes::SubscribeReturncode* codes, size_t len) {
+  Serial.println("Subscribe acknowledged.");
+  Serial.print("  packetId: ");
+  Serial.println(packetId);
+  for (size_t i = 0; i < len; ++i) {
+    Serial.print("  qos: ");
+    Serial.println(static_cast<uint8_t>(codes[i]));
+  }
+}
+
+void onMqttUnsubscribe(uint16_t packetId) {
+  Serial.println("Unsubscribe acknowledged.");
+  Serial.print("  packetId: ");
+  Serial.println(packetId);
+}
+
+void onMqttMessage(const espMqttClientTypes::MessageProperties& properties, const char* topic, const uint8_t* payload, size_t len, size_t index, size_t total) {
+  (void) payload;
+  Serial.println("Publish received.");
+  Serial.print("  topic: ");
+  Serial.println(topic);
+  Serial.print("  qos: ");
+  Serial.println(properties.qos);
+  Serial.print("  dup: ");
+  Serial.println(properties.dup);
+  Serial.print("  retain: ");
+  Serial.println(properties.retain);
+  Serial.print("  len: ");
+  Serial.println(len);
+  Serial.print("  index: ");
+  Serial.println(index);
+  Serial.print("  total: ");
+  Serial.println(total);
+}
+
+void onMqttPublish(uint16_t packetId) {
+  Serial.println("Publish acknowledged.");
+  Serial.print("  packetId: ");
+  Serial.println(packetId);
+}
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println();
+  Serial.println();
+
+  WiFi.setAutoConnect(false);
+  WiFi.setAutoReconnect(true);
+  WiFi.onEvent(WiFiEvent);
+
+  mqttClient.onConnect(onMqttConnect);
+  mqttClient.onDisconnect(onMqttDisconnect);
+  mqttClient.onSubscribe(onMqttSubscribe);
+  mqttClient.onUnsubscribe(onMqttUnsubscribe);
+  mqttClient.onMessage(onMqttMessage);
+  mqttClient.onPublish(onMqttPublish);
+  mqttClient.setServer(MQTT_HOST, MQTT_PORT);
+
+  connectToWiFi();
+}
+
+void loop() {
+  static uint32_t currentMillis = millis();
+
+  if (reconnectMqtt && currentMillis - lastReconnect > 5000) {
+    connectToMqtt();
+  }
+}

examples/simple-esp32-idf/sdkconfig.defaults

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+#
+# Bootloader config
+#
+CONFIG_BOOTLOADER_COMPILER_OPTIMIZATION_SIZE=y
+CONFIG_BOOTLOADER_LOG_LEVEL_NONE=y
+CONFIG_BOOTLOADER_LOG_LEVEL=0
+
+#
+# Serial flasher config
+#
+CONFIG_ESPTOOLPY_FLASHMODE_DIO=y
+CONFIG_ESPTOOLPY_FLASHMODE="dio"
+CONFIG_ESPTOOLPY_FLASHFREQ_40M=y
+CONFIG_ESPTOOLPY_FLASHFREQ="40m"
+CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y
+CONFIG_ESPTOOLPY_FLASHSIZE="4MB"
+#
+# Partition Table
+#
+CONFIG_PARTITION_TABLE_CUSTOM=n
+
+#
+# Arduino Configuration
+#
+CONFIG_ARDUINO_VARIANT="esp32"
+CONFIG_ENABLE_ARDUINO_DEPENDS=y
+CONFIG_AUTOSTART_ARDUINO=y
+
+#
+# FreeRTOS
+#
+# 1000 require for Arduino
+CONFIG_FREERTOS_HZ=1000
+
+#ASYNC_TCP
+CONFIG_ASYNC_TCP_RUN_NO_AFFINITY=y
+
+#MBEDTLS
+CONFIG_MBEDTLS_PSK_MODES=y