upgrad esp mqtt lib

lib/espMqttClient/examples/ota-esp8266/ota-esp8266.ino

@@ -1,5 +1,7 @@
 #include <ESP8266WiFi.h>
 #include <Updater.h>
+#include <Ticker.h>
+
 #include <espMqttClient.h>
 
 #define WIFI_SSID "yourSSID"
@@ -13,6 +15,8 @@
 WiFiEventHandler wifiConnectHandler;
 WiFiEventHandler wifiDisconnectHandler;
 espMqttClient mqttClient;
+bool reconnectMqtt = false;
+uint32_t lastReconnect = 0;
 bool disconnectFlag = false;
 bool restartFlag = false;
 
@@ -23,7 +27,13 @@ void connectToWiFi() {
 
 void connectToMqtt() {
   Serial.println("Connecting to MQTT...");
-  mqttClient.connect();
+  if (!mqttClient.connect()) {
+    reconnectMqtt = true;
+    lastReconnect = millis();
+    Serial.println("Connecting failed.");
+  } else {
+    reconnectMqtt = false;
+  }
 }
 
 void onWiFiConnect(const WiFiEventStationModeGotIP& event) {
@@ -53,7 +63,8 @@ void onMqttDisconnect(espMqttClientTypes::DisconnectReason reason) {
   }
   
   if (WiFi.isConnected()) {
-    connectToMqtt();
+    reconnectMqtt = true;
+    lastReconnect = millis();
   }
 }
 
@@ -125,16 +136,22 @@ void setup() {
 }
 
 void loop() {
-  mqttClient.loop();
-
-  if (disconnectFlag) {
-    // it's safe to call this multiple times
-    mqttClient.disconnect();
-  }
-
   if (restartFlag) {
     Serial.println("Rebooting... See you next time!");
     Serial.flush();
     ESP.reset();
   }
+
+  static uint32_t currentMillis = millis();
+
+  mqttClient.loop();
+
+  if (!disconnectFlag && reconnectMqtt && currentMillis - lastReconnect > 5000) {
+    connectToMqtt();
+  }
+
+  if (disconnectFlag) {
+    // it's safe to call this multiple times
+    mqttClient.disconnect();
+  }
 }