Signal quality not updated with Quectel EG25 through QMI

Fri Oct 1 15:52:30 UTC 2021

Last try of the day, I built a ModemManager with WITH_NEWEST_QMI_COMMANDS enable and things goes pretty well since I got lot of more update than before (see log joined)

Looking at the code implied, this is expected because there are more thresholds and they have better granularity ({ -100, -97, -95, -92, -90, -85, -80, -75, -70, -65 })

Anyway, all of that seems to behave as expected (considering signal thresholds configured), maybe I just have to review the need for my application to have an "up to date" (whatever it means) signal quality information.

One last question though, what is the drawbacks of using newest QMI commands ? Is this is experimental ? What I risk if I choose to use it (since my system must support a large variety of modem type and not  just the EC25 one) ?

In the end, thank you very much for your support Alexsander.

________________________________
From: ModemManager-devel <modemmanager-devel-bounces at lists.freedesktop.org> on behalf of Frederic Martinsons <frederic.martinsons at sigfox.com>
Sent: Friday, October 1, 2021 5:15 PM
To: Aleksander Morgado <aleksander at aleksander.es>
Cc: modemmanager-devel at lists.freedesktop.org <modemmanager-devel at lists.freedesktop.org>
Subject: Re: Signal quality not updated with Quectel EG25 through QMI

I just tested to grow the threasholds_data to have better granularity (I used { -90, -80, -70, -60, -58, -56, -54, -52, -50 } ) and like the comment in the code said, my modem didn't like is 😉

I got a "couldn't enable signal strength indications: 'QMI protocol error (19): 'ArgumentTooLong''"

But, this seems to have enable the polling of signal info and I got what I wanted in the first place (a value updated very 30s) even if the signal rssi doesn't change (stay at -58 dBm).

I'm wondering if there is a way to cleanly enable polling and don't rely on signal indicator (but this will go against the logic).
________________________________
From: ModemManager-devel <modemmanager-devel-bounces at lists.freedesktop.org> on behalf of Frederic Martinsons <frederic.martinsons at sigfox.com>
Sent: Friday, October 1, 2021 3:50 PM
To: Aleksander Morgado <aleksander at aleksander.es>
Cc: modemmanager-devel at lists.freedesktop.org <modemmanager-devel at lists.freedesktop.org>
Subject: Re: Signal quality not updated with Quectel EG25 through QMI

Ok thanks for the tips, should I issue a merge request with the modified threshold ?

I my application needs to have a rapid refresh rate of signal quality, do you think it will be correct (I means without impact on modem connectivity/stability) to send regularly mmcli --signal-get (the equivalent DBus method at least) at a regular rate ?

If so, can you tell me how I can get the signal quality percentage from the raw RSSI value ?
________________________________
From: Aleksander Morgado <aleksander at aleksander.es>
Sent: Friday, October 1, 2021 3:35 PM
To: Frederic Martinsons <frederic.martinsons at sigfox.com>
Cc: modemmanager-devel at lists.freedesktop.org <modemmanager-devel at lists.freedesktop.org>
Subject: Re: Signal quality not updated with Quectel EG25 through QMI

Hey,

> So I tried on my own computer and it was the same, as you suggested I activated extended signal interface every 10s and by moving around I managed to make the RSSI moved from -59 dBm to -75 dBm and the signal quality stays not updated.
>
> If I understand correctly, this is an expected behavior with the threshold configured (on my own Pc , I used a "vanilla" ModemManager) , if the rssi doesn't come accross one of thresholds configured (so -80, -40, 0, 40 or 80) , the signal indication would not be fired ?
>
> Am I right ?

That's the assumption, yes.

--
Aleksander
https://aleksander.es

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