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有一个问题想要请教各位大佬：
判断节点的信号强度，我是通过读取RSSI值来，我想问一下，这个RSSI值是节点和协调器之间的信号强度，还是节点和他的父节点之间的信号强度，又或者说，这个信号强度是节点和它的路由路线中下一跳之间的信号强度？
先行感谢！！
