1. [iOS MQTT(内含DEMO) ](https://www.meiwen.com.cn/subject/pdpjnttx.html)
2. [iOS MQTT----MQTTClient实战-看这篇的就够了](https://cloud.tencent.com/developer/article/1365843)
3. [组播详解【转】](https://www.cnblogs.com/LCHL/p/3320649.html)
4.[UDP协议的详细解析](https://blog.csdn.net/aa1928992772/article/details/85240358)
5.[iOS MQTT协议笔记](https://www.jianshu.com/p/38e8cf68796c)
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