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怎么知道节点断线?

我的-DPOLL_RATE=1000是默认的没有改,也加了NWK_AUTO_POLL编译选项。

问下:节点去请求父节点数据,这个数据交互我们能看到吗?能不能用这个请求,做跟父节点的心跳报,判断节点是不是断网。协议版本2.5.1a?