附录
<p>[TOC]</p>
<h2>MQTT协议</h2>
<p>MQTT协议可参考[MQTT 协议快速入门](<a href="https://www.emqx.com/zh/blog/the-easiest-guide-to-getting-started-with-mqtt">https://www.emqx.com/zh/blog/the-easiest-guide-to-getting-started-with-mqtt</a> "MQTT 协议快速入门")</p>