修改mqtt地址、增加心跳功能

src/main/resources/application-dev.properties

@@ -37,7 +37,7 @@ mqtt.port=8083
 mqtt.username=test
 mqtt.password=public
 #mqtt.broker=49.233.41.108
-#mqtt.port=1883
+#mqtt.port=8084
 #mqtt.username=shangxingkeji
 #mqtt.password=sxkj@1234