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如何判断终端节点是否掉线，我一个协调器配10个终端，有一种方法是让终端定期发心跳给协调器，如果协调器没收到就说明该节点掉线，但是总共有十多个节点，协调器怎么判断是哪一个节点的心跳没收到？？
目前最新版本的协议栈里面有Child Aging这个功能了
