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如何获取Endpoint和Router间的信号强度RSSI值,并上报协调器

如果有协调器A,路由B,终端节点C。在组网后,C的父节点是B,B的父节点是A。此时协调器A如何来获得终端节点的信号强度?

信号强度RSSI值是不是只在子节点和父节点之间有意义?是否应该先由父节点B获取C的信号强度,再上报给A?