Retrieving SNR/SINR values for 3G connections.

[Aleksander Morgado]

On Thu, Oct 19, 2017 at 1:45 PM, Paul Gildea <gildeap at tcd.ie> wrote:
> I want to query a modem (MC7455) and find out the SNR values periodically.
> I've noticed that this information is only available while on LTE?
>

SNR is only defined for LTE signal in the QMI NAS specs, yes:
https://cgit.freedesktop.org/libqmi/tree/data/qmi-service-nas.json#n3225

>
> To that end I noticed that both connections report SINR.  However the value
> is always static (SINR (8): '9.0 dB'), is this a placeholder or does it
> vary?
>

The modem reports "SINR Level 8" and we convert that to 9.0 dB (it's a
direct mapping):
https://cgit.freedesktop.org/libqmi/tree/src/qmicli/qmicli-nas.c#n216

-- 
Aleksander
https://aleksander.es