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学习太极创客 — MQTT 第二章（三）保留消息
2022-06-27 02:10:00 【xuechanba】
视频链接：https://www.bilibili.com/video/BV1pv411b7o1/?spm_id_from=autoNext&vd_source=b91967c499b23106586d7aa35af46413
资料链接：http://www.taichi-maker.com/homepage/esp8266-nodemcu-iot/iot-tuttorial/mqtt-tutorial/retained-messages/
“保留消息”是十分重要的 MQTT 概念。通过“保留消息”这一名称不难判断，“保留消息”是一种被保留下来的消息。但是这个“保留消息”为何要被保留？而保留消息又是有什么特殊的用途？
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