在协议栈底层会完成数据的重发，总共会发送8次，如果没有ACK的情况下，
如果你需要在应用层知道这个事件的，
1）节点可以发送应用层数据通知。
2）你可以根据trans ID来一一对应
第一种方式更加直接点，。
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