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终端设备如何发现父节点离开网络



现在出现的问题描述如下:当A终端设备(enddevice)的父节点(router or coordinator)离开网络(可能断电等原因),别的设备无法与A设备进行正常单播通讯。那么A终端设备在协议栈中那个地方能够知道这个事件,并重新加入到别的父节点(router or coordinator)中。
   PS: 开启了NV功能