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如果是节点主动离开的，则节点会发送leave消息。
如果是意外离开，只能是应用层做相关的心跳机制了。
但是对于End device，现在Z-stack Home 1.2.0协议栈里面加入了child aging功能，如果节点长时间不跟父节点通信，父节点会把节点信息删除掉
有具体的程序实现吗
