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Zstaci中的RSSI和LQI

有两个设备,协调器A和终端B。协议栈zstack-mesh

1、终端B发送给协调器A一个数据,协调器保存pkt->LinkQuality和pkt->rssi,这两个值分别是什么意思?

2、pkt->rssi值可以直接用来表示接受信号强度dBm么?如果不行,换算公式是什么?

3、我想通过串口,查询终端B的信号强度,该怎么而实现?