mqtt disconnect 19

在运行过程中，接收到
on_disconnect callback rc = 19
on_connect callback rc = 0

mqtt disconnect rc = 19

网上没有查到相关的错误说明。

官方api
rc integer value indicating the reason for the disconnect. A value of 0 means the client has called mosquitto_disconnect. Any other value indicates that the disconnect is unexpected.

只说非0表示异常断开。

怀疑是网络异常断开导致，自动能重连恢复。

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