fixed auto reconnect and resubscribe inside mqtt wrapper loop

lib/RS485/RS485_Driver.h

@@ -17,6 +17,9 @@ namespace drivers
 
     public:
         RS485(const uint32_t baud, const SerialConfig conf);
+        RS485(const RS485 &) = delete; // remove copy constructors
+        RS485 &operator=(const RS485 &) = delete;
+
         const bool write(const std::vector<uint8_t> data);
         const bool readAll(std::vector<uint8_t> &data);
         const bool readN(const uint16_t nBytes, std::vector<uint8_t> &data);
@@ -54,6 +57,9 @@ namespace drivers
 
     public:
         MODBUS(const uint32_t baud, const SerialConfig conf);
+        MODBUS(const MODBUS &) = delete; // remove copy constructors
+        MODBUS &operator=(const MODBUS &) = delete;
+
 
         // Func 0x01
         const bool readCoils(const uint8_t device, const uint16_t reg, const uint16_t num, std::vector<bool> &coils);

src/main.cpp

@@ -34,12 +34,11 @@ void setup()
 {
   Serial.begin(9600);
   LOG_ATTACH_SERIAL(Serial);
-  conf.init();
+  conf.init();  // read the configuration from internal flash
 }
 
 void loop()
 {
-  const uint8_t baseRegister(0x00);
   uint16_t k(0);
   uint8_t sensors(0);
   bool buzzing(false);
@@ -66,10 +65,17 @@ void loop()
   auto mqtt = MQTTwrapper();
   //////////////// NETWORK ////////////////
 
+  std::function<void(const ArduinoJson::JsonDocument &)> mycallback = 
+    [&io](const ArduinoJson::JsonDocument &doc) {
+        io.digitalIOWrite(0, doc["stat"].as<bool>());
+        io.digitalIOWrite(15, doc["stat"].as<bool>());
+    };
+
+
   //////////////// NETWORK ////////////////
   /////////////// CALLBACK ////////////////
   Network.onEvent(
-      [&eth, &rtc, &mqtt, &buzzer, &led](arduino_event_id_t event, arduino_event_info_t info) -> void
+      [&eth, &rtc, &mqtt, &buzzer, &led, &mycallback](arduino_event_id_t event, arduino_event_info_t info) -> void
       {
         eth.onEvent(event, info); // Arduino Ethernet event handler
         if (!eth.isConnected())
@@ -95,6 +101,7 @@ void loop()
           if (mqtt.connect())
           {
             mqtt.subscribe("test/esp32-in", testAction);
+            mqtt.subscribe("test/esp32-functional", mycallback);
             break;
           }
           delay(100);

src/mqtt.cpp

@@ -1,7 +1,7 @@
 #include <mqtt.h>
 
 #define STACK_DEPTH 4096
-#define PRIOTITY 1
+#define PRIOTITY 0
 
 MQTTwrapper::MQTTwrapper() : m_config(Config::getInstance()), m_tcp(NetworkClient()), m_client(PubSubClient(m_tcp)), m_loopHandle(NULL)
 {
@@ -19,7 +19,7 @@ const bool MQTTwrapper::connect()
 {
     if (!m_client.connect(m_config.m_mqttClientName.c_str()))
     {
-        LOG_ERROR("Unable to connect to MQTT Host", m_config.m_mqttHost.c_str());
+        LOG_ERROR("MQTT unable to connect to host", m_config.m_mqttHost.c_str());
         return false;
     }
     LOG_INFO("MQTT client connected to", m_config.m_mqttHost.c_str());
@@ -78,6 +78,11 @@ const bool MQTTwrapper::unsubscribe(topic_t topic)
 const bool MQTTwrapper::publish(topic_t topic, const ArduinoJson::JsonDocument obj)
 {
     std::string message;
+    if (!m_client.connected())
+    {
+        LOG_ERROR("MQTT client not connected");
+        return false;
+    }
     if (!ArduinoJson::serializeJson(obj, message))
     {
         LOG_ERROR("MQTT failed to serialize object");
@@ -95,8 +100,8 @@ const bool MQTTwrapper::publish(topic_t topic, const ArduinoJson::JsonDocument o
 void MQTTwrapper::callback(char *topic, uint8_t *payload, unsigned int length)
 {
     std::string pl;
-    pl.resize(length+1);
-    std::snprintf(pl.data(), length+1, "%s", payload);
+    pl.resize(length + 1);
+    std::snprintf(pl.data(), length + 1, "%s", payload);
     auto inst = getInstance();
     if (inst)
     {
@@ -124,11 +129,31 @@ void MQTTwrapper::clientLoop(void *params)
 {
     auto client = (MQTTwrapper *)(params);
     auto loopTime = client->m_config.m_mqttLoopTime;
-    LOG_INFO("Starting MQTT client loop");
-    while (client->m_client.connected())
+    uint8_t connectAttempt(0);
+    LOG_INFO("MQTT starting client loop");
+    while (connectAttempt++ < client->m_config.m_mqttRetries)
     {
-        client->m_client.loop();
-        vTaskDelay(pdMS_TO_TICKS(loopTime));
+        while (client->m_client.connected())
+        {
+            client->m_client.loop();
+            vTaskDelay(pdMS_TO_TICKS(loopTime));
+        }
+        if (client->m_client.state() <= MQTT_CONNECTED)
+        {
+            LOG_ERROR("MQTT disconnect reason ", client->m_client.state());
+            vTaskDelay(pdMS_TO_TICKS(loopTime * 50));
+            const bool ok = client->m_client.connect(client->m_config.m_mqttClientName.c_str());
+            LOG_WARN("MQTT reconnected", ok ? "True" : "False");
+            if (ok)
+            {
+                for (auto v : client->m_actionMap)
+                {
+                    LOG_WARN("MQTT resubscribing to",v.first.c_str());
+                    client->m_client.subscribe(v.first.c_str());
+                }
+                connectAttempt = 0;
+            }
+        }
     }
     LOG_ERROR("MQTT client loop terminated, disconnected");
     client->m_loopHandle = NULL;

src/mqtt.h

@@ -11,6 +11,7 @@
 #include <config.h>
 
 #include <mutex>
+#include <functional>
 
 typedef std::string topic_t;
 typedef std::function<void(const ArduinoJson::JsonDocument &)> action_t; // the actions receive a JsonObject containing the received message