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Z-Stack的终端节点如何尽早判断是否有网络存在

设计要求,终端节点平时都处在睡眠定时器睡眠状态,

每隔一段时间检查一下是否存在网络。

为了省电,需要尽早知道是否检测到网络。

问使用什么函数或者其他方式能够得知是否有网络?

十分感谢!~