FullyFeatured_ESP32.ino

/****************************************************************************************************************************
  FullyFeature_ESP32.ino

  AsyncMQTT_ESP32 is a library for ESP32 boards using WiFi or LwIP W5500, LAN8720 or ENC28J60

  Based on and modified from :

  1) async-mqtt-client (https://github.com/marvinroger/async-mqtt-client)
  2) async-mqtt-client (https://github.com/khoih-prog/AsyncMQTT_Generic)

  Built by Khoi Hoang https://github.com/khoih-prog/AsyncMQTT_ESP32
 *****************************************************************************************************************************/
/*
  This example uses FreeRTOS softwaretimers as there is no built-in Ticker library
*/

#include "defines.h"

#include <WiFi.h>

extern "C"
{
#include "freertos/FreeRTOS.h"
#include "freertos/timers.h"
}
#include <AsyncMQTT_ESP32.h>

//#define MQTT_HOST         IPAddress(192, 168, 2, 110)
#define MQTT_HOST         "broker.emqx.io"        // Broker address
#define MQTT_PORT         1883

const char *PubTopic  = "async-mqtt/ESP32_Pub";               // Topic to publish

AsyncMqttClient mqttClient;
TimerHandle_t mqttReconnectTimer;
TimerHandle_t wifiReconnectTimer;

void connectToWifi()
{
  Serial.println("Connecting to Wi-Fi...");
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
}

void connectToMqtt()
{
  Serial.println("Connecting to MQTT...");
  mqttClient.connect();
}

void WiFiEvent(WiFiEvent_t event)
{
  switch (event)
  {
#if USING_CORE_ESP32_CORE_V200_PLUS

    case ARDUINO_EVENT_WIFI_READY:
      Serial.println("WiFi ready");
      break;

    case ARDUINO_EVENT_WIFI_STA_START:
      Serial.println("WiFi STA starting");
      break;

    case ARDUINO_EVENT_WIFI_STA_CONNECTED:
      Serial.println("WiFi STA connected");
      break;

    case ARDUINO_EVENT_WIFI_STA_GOT_IP6:
    case ARDUINO_EVENT_WIFI_STA_GOT_IP:
      Serial.println("WiFi connected");
      Serial.print("IP address: ");
      Serial.println(WiFi.localIP());
      connectToMqtt();
      break;

    case ARDUINO_EVENT_WIFI_STA_LOST_IP:
      Serial.println("WiFi lost IP");
      break;

    case ARDUINO_EVENT_WIFI_STA_DISCONNECTED:
      Serial.println("WiFi lost connection");
      xTimerStop(mqttReconnectTimer, 0); // ensure we don't reconnect to MQTT while reconnecting to Wi-Fi
      xTimerStart(wifiReconnectTimer, 0);
      break;
#else

    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");
      xTimerStop(mqttReconnectTimer, 0); // ensure we don't reconnect to MQTT while reconnecting to Wi-Fi
      xTimerStart(wifiReconnectTimer, 0);
      break;
#endif

    default:
      break;
  }
}

void printSeparationLine()
{
  Serial.println("************************************************");
}

void onMqttConnect(bool sessionPresent)
{
  Serial.print("Connected to MQTT broker: ");
  Serial.print(MQTT_HOST);
  Serial.print(", port: ");
  Serial.println(MQTT_PORT);
  Serial.print("PubTopic: ");
  Serial.println(PubTopic);

  printSeparationLine();
  Serial.print("Session present: ");
  Serial.println(sessionPresent);

  uint16_t packetIdSub = mqttClient.subscribe(PubTopic, 2);
  Serial.print("Subscribing at QoS 2, packetId: ");
  Serial.println(packetIdSub);

  mqttClient.publish(PubTopic, 0, true, "ESP32 Test");
  Serial.println("Publishing at QoS 0");

  uint16_t packetIdPub1 = mqttClient.publish(PubTopic, 1, true, "test 2");
  Serial.print("Publishing at QoS 1, packetId: ");
  Serial.println(packetIdPub1);

  uint16_t packetIdPub2 = mqttClient.publish(PubTopic, 2, true, "test 3");
  Serial.print("Publishing at QoS 2, packetId: ");
  Serial.println(packetIdPub2);

  printSeparationLine();
}

void onMqttDisconnect(AsyncMqttClientDisconnectReason reason)
{
  (void) reason;

  Serial.println("Disconnected from MQTT.");

  if (WiFi.isConnected())
  {
    xTimerStart(mqttReconnectTimer, 0);
  }
}

void onMqttSubscribe(const uint16_t& packetId, const uint8_t& qos)
{
  Serial.println("Subscribe acknowledged.");
  Serial.print("  packetId: ");
  Serial.println(packetId);
  Serial.print("  qos: ");
  Serial.println(qos);
}

void onMqttUnsubscribe(const uint16_t& packetId)
{
  Serial.println("Unsubscribe acknowledged.");
  Serial.print("  packetId: ");
  Serial.println(packetId);
}

void onMqttMessage(char* topic, char* payload, const AsyncMqttClientMessageProperties& properties,
                   const size_t& len, const size_t& index, const 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(const uint16_t& packetId)
{
  Serial.println("Publish acknowledged.");
  Serial.print("  packetId: ");
  Serial.println(packetId);
}

void setup()
{
  Serial.begin(115200);

  while (!Serial && millis() < 5000);

  delay(500);

  Serial.print("\nStarting FullyFeature_ESP32 on ");
  Serial.println(ARDUINO_BOARD);
  Serial.println(ASYNC_MQTT_ESP32_VERSION);

  mqttReconnectTimer = xTimerCreate("mqttTimer", pdMS_TO_TICKS(2000), pdFALSE, (void*)0,
                                    reinterpret_cast<TimerCallbackFunction_t>(connectToMqtt));
  wifiReconnectTimer = xTimerCreate("wifiTimer", pdMS_TO_TICKS(2000), pdFALSE, (void*)0,
                                    reinterpret_cast<TimerCallbackFunction_t>(connectToWifi));

  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()
{
}