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有不少地方没有考虑到 rt_tick 溢出的情况,长时间运行可能会出错  #16

@majianjia

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@majianjia

if (((client->uplink_next_tick <= rt_tick_get())

|| ((client->pingreq_last_tick + _connect_kp_time) < rt_tick_get()))

还有tick 大小比较的地方,在溢出后也会有问题。

umqtt/src/umqtt.c

Line 1011 in 6609efd

else if ((client->uplink_last_tick >= client->uplink_next_tick)

还有一些地方是默认了tick = 1ms,如果不是的话也会出错
需要用RT_TICK_PER_SECOND 或者那个milisecond 的API改一下

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