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mqtt的心跳检测在pingreq之后,在windows操作系统的某些极端情况下由于异步的原因,会立刻收到pong,导致ping的时间竟然在pong之后,此时checkAlive函数还在等待pong消息,但此时已经收到返回了,所以一直都等不到,所以会超时。解决方法就是在ping之后第一次检测超时的时候补发一次ping,但不更新时间,此时就会收到新的pong消息,不会让进程被移除