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APS ACK 的问题

Other Parts Discussed in Thread: Z-STACK

想问一下,当我开启aps ack时,如果的我终端设备发送数据给协调器后,

1、协调器正确接收到数据,是单播返回给终端设备一个ack还是给应用层一个ack

2、如果1是正确的当终端检测到协调器正确的ack后,再开启下一次传输,那如果接收到了错误的zck,应用层是否需要用户处理?

3、有没有这种情况,协调器实际接收到了终端设备发来的数据,但是还没来及的给终端一个ack,会导致终端又发送了一次?