Python 使用 paho-mqtt

https://blog.csdn.net/weixin_41656968/article/details/80848542

http://www.javashuo.com/article/p-yyxmdwae-kw.html

http://shumeipai.nxez.com/2018/09/16/install-mosquitto-on-the-raspberry-pi-to-implement-mqtt.html