FIX: force the wifi radio reset and wifi connection on the first loop…

… call

Sometimes, Wifi.status() will return CONNECTED instead of DISCONNECTED at the bigenning and this causes issue to this lib. Now we forces the radio reset and we plan the wifi connection at the first loop call.

src/EspMQTTClient.cpp

@@ -133,6 +133,17 @@ void EspMQTTClient::enableLastWillMessage(const char* topic, const char* message
 
 void EspMQTTClient::loop()
 {
+  static bool firstLoopCall = true;
+
+  // When it's the first loop call, reset the wifi radio and schedule the wifi connection
+  if(firstLoopCall && _wifiSsid != NULL)
+  {
+    WiFi.disconnect(true);
+    _nextWifiConnectionAttemptMillis = millis() + 500;
+    firstLoopCall = false;
+    return;
+  }
+
   // Delayed execution requests handling
   processDelayedExecutionRequests();