在RT-Thread中，rt_mq_recv的返回值是收到消息的长度，修改umqtt.c中对其返回值的错误判断#21
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yplwrt wants to merge 1 commit intoRT-Thread-packages:masterfrom
Open
在RT-Thread中，rt_mq_recv的返回值是收到消息的长度，修改umqtt.c中对其返回值的错误判断#21yplwrt wants to merge 1 commit intoRT-Thread-packages:masterfrom
yplwrt wants to merge 1 commit intoRT-Thread-packages:masterfrom
