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Philips的ZLL Hue是如何判断设备不在网络的

如题,用Philips的hue测试的时候,当打开APP时如果灯没有打开时,APP端会提示无法控制,灯打开后APP端显示可控,这里是如何实现的?

网关是如何获取设备在线与否

1、ZigBee设备离线,父节点可以自动获取到这个消息?

2、还是网关用轮询去判断设备离线,收不到即算离线,这样如果周期过大则对网络负担也很大