mqtt disconnect 7 错误

连接上mqtt服务器后，一段时间就出现下面提示：
on_disconnect callback rc = 7
on_connect callback rc = 0
on_disconnect callback rc = 7
on_connect callback rc = 0
on_disconnect callback rc = 7
on_connect callback rc = 0
on_disconnect callback rc = 7
on_connect callback rc = 0
on_disconnect callback rc = 7
on_connect callback rc = 0
on_disconnect callback rc = 7
on_connect callback rc = 0
on_disconnect callback rc = 7
on_connect callback rc = 0
on_disconnect callback rc = 7
on_connect callback rc = 0

在网上看了一下，有说同一个clientid二个连接同时使用可以有导致这个问题，也有说调小keepalive就好了。

I guess i solve this question.

i set a small keep-alive number. And NOT happen until now.

将原来的keepalive从60调到30就好了。

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