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mqtt服务器用的什么，消息是如何发送的?
@Zhang书书 EMQX mqtt 消息不是发送的 是之前有过的数据 重启就会上来一遍
那是因为这条消息是保留消息，可以查一下mqtt协议里，关于保留消息的介绍。这个是发送消息的客户端发消息时的设置
