修改mqtt地址、增加心跳功能

src/main/resources/application-prod.properties

@@ -40,7 +40,7 @@ file.url=https://www.rfcare.cn/care-file/
 #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