[riot-notifications] [RIOT-OS/RIOT] sys/net/gnrc: fix in-band signaling of no RSSI/LQI (#15754)

benpicco notifications at github.com
Tue Jan 12 18:58:39 CET 2021

IEEE Std 802.15.4-2020 says

> RSSI is a measure of the RF power in dBm for the received packet. The RF power level at the input of the
transceiver measured during the PHR and is valid after the start-of-frame delimiter (SFD) is detected. RSSI
is represented as one octet of integer as shown in Table 8-108; therefore, the minimum and maximum values
are 0 (–174 dBm) and 254 (80 dBm), respectively. 255 is reserved. If any measured value is less than
–174 dBm then the reported value shall be rounded up to –174 dBm.

However, this convention is only used by radio HAL drivers so far.

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