2021-03-04T15:55:35 -   ERROR -    mqtt - Unexpected disconnection from 127.0.0.1:1883
2021-03-04T15:55:35 -    INFO -    mqtt - Reconnecting to 127.0.0.1:1883 ...
2021-03-04T15:55:35 -   ERROR -    mqtt - Unexpected disconnection from 127.0.0.1:1883
2021-03-04T15:55:35 -    INFO -    mqtt - Reconnecting to 127.0.0.1:1883 ...
2021-03-04T15:55:35 -   ERROR -    mqtt - Unexpected disconnection from 127.0.0.1:1883
2021-03-04T15:55:35 -    INFO -    mqtt - Reconnecting to 127.0.0.1:1883 ...
2021-03-04T15:55:35 -    INFO -    job - Starting job "getGGA" for port "com" ...
2021-03-04T15:55:35 -   ERROR -    mqtt - Publishing message failed: no connection

参考：

https://hbmqtt.readthedocs.io/en/latest/quickstart.html

为了测试HBMQTT是否可以正常连接，在dos界面下测试：
hbmqtt_pub --url mqtt://localhost:1884 -t /test -m "Hello"

[2021-03-04 16:29:50,399] :: INFO - hbmqtt_pub/6976-DESKTOP-N0UE137 Connecting to broker

[2021-03-04 16:29:54,523] :: WARNING - MQTT connection failed: ConnectionRefusedError(22, '远程计算机拒绝网络连接。', None, 1225, None)

[2021-03-04 16:29:54,524] :: INFO - Finished processing state new exit callbacks.

[2021-03-04 16:29:54,530] :: INFO - Finished processing state disconnected enter callbacks.

[2021-03-04 16:29:54,532] :: WARNING - Connection failed: ConnectException(ConnectionRefusedError(22, '远程计算机拒绝网 络连接。', None, 1225, None))

[2021-03-04 16:29:54,533] :: CRITICAL - connection to 'mqtt://localhost:1884' failed: ConnectException(ConnectionRefusedError(22, '远程计算机拒绝网络连接。', None, 1225, None))

可以看到问题显示：

MQTT connection failed: ConnectionRefusedError(22, '远程计算机拒绝网络连接。', None, 1225, None)

测试电脑IP和 端口是否通

https://www.jianshu.com/p/d4f42ca05536

telnet 127.0.0.1 1883

正在连接127.0.0.1...无法打开到主机的连接。 在端口 1883: 连接失败

由此可见，端口1883不通；

还可以通过strsvr查看1883是否通

可以看到output并不通

如何在windows下开启任意端口？

https://jingyan.baidu.com/article/54b6b9c029675e2d583b47aa.html