Merge branch 'master' into feature/connection-info

# Conflicts:
#	library.properties

Author: jburhenn

src/CayenneArduinoMQTTClient.h

@@ -288,7 +288,7 @@ class CayenneArduinoMQTTClient
 	* @param channel  Cayenne channel number
 	* @param value  Value to be sent
 	*/
-	void digitalSensorWrite(unsigned int channel, float value)
+	void digitalSensorWrite(unsigned int channel, int value)
 	{
 		virtualWrite(channel, value, F(TYPE_DIGITAL_SENSOR), F(UNIT_DIGITAL));
 	}

src/CayenneMQTTClient/MQTTClient.c

@@ -228,6 +228,11 @@ int keepalive(MQTTClient* c)
 				TimerCountdown(&c->ping_response_timer, c->keepAliveInterval);
 				c->ping_outstanding = 1;
 			}
+			else if (rc == MQTT_FAILURE && TimerIsExpired(&c->last_received_timer))
+			{
+				//If the ping packet failed and the last received timer has expired assume we are disconnected
+				c->isconnected = 0;
+			}
         }
 		else if (TimerIsExpired(&c->ping_response_timer))
 		{