[riot-notifications] [RIOT-OS/RIOT] sys/inet/ieee802154/radio: fix wrong rssi conversions treewide (#15616)

Francisco notifications at github.com
Wed Jan 13 17:40:48 CET 2021

@fjmolinas commented on this pull request.

> +            /* We calculate RSSI from LQI, since it's already 8-bit
+               saturated */

>From the standard I'm not convinced the value is wrong [iee802154-2020 p.457](https://sci-hub.se/downloads/2020-07-27/06/ieee-standard-for-lowrate-wireless-networks.pdf?rand=5fff1f10b3853):

10.2.7 Link quality indicator (LQI)
The LQI measurement is a characterization of the strength and/or quality of a received packet. The
measurement may be implemented using receiver ED, a signal-to-noise ratio estimation, or a combination of
these methods. The use of the LQI result by the network or application layers is not specified in this
The LQI measurement shall be performed for each received packet. The minimum and maximum LQI
values (0x00 and 0xff) should be associated with the lowest and highest quality compliant signals detectable
by the receiver, and LQI values in between should be uniformly distributed between these two limits. At
least eight unique values of LQI shall be used.

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