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如何实现切换信道?

情景描述:现在有一个PAN协调器、一个路由节点、二个终端节点,其中一个终端的父节点是PAN协调器、另一个为路由节点   现在已经组好网络。

问题:
1.如何实现路由节点周期性切换不同信道,分别与其父节点和子节点通讯?
2.在同一个PANID网络是否不允许两个信道同时存在?