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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.</div>
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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 ?</div>
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Am I right ?</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> ModemManager-devel <modemmanager-devel-bounces@lists.freedesktop.org> on behalf of Frederic Martinsons <frederic.martinsons@sigfox.com><br>
<b>Sent:</b> Friday, October 1, 2021 12:07 PM<br>
<b>To:</b> Aleksander Morgado <aleksander@aleksander.es><br>
<b>Cc:</b> modemmanager-devel@lists.freedesktop.org <modemmanager-devel@lists.freedesktop.org><br>
<b>Subject:</b> Re: Signal quality not updated with Quectel EG25 through QMI</font>
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<span style="color:rgb(32,31,30); font-size:14.6667px; background-color:rgb(255,255,255); display:inline!important">> If you cannot physically remove the antenna for the testing, can you</span><br>
<span style="color:rgb(32,31,30); font-size:14.6667px; background-color:rgb(255,255,255); display:inline!important">> at least move the modem around? You may also enable the extended</span><br style="color:rgb(32,31,30); font-size:14.6667px; background-color:rgb(255,255,255)">
<span style="color:rgb(32,31,30); font-size:14.6667px; background-color:rgb(255,255,255); display:inline!important">> signal interface with e.g. a 10s rate and see if the reported RSSI</span><br style="color:rgb(32,31,30); font-size:14.6667px; background-color:rgb(255,255,255)">
<span style="color:rgb(32,31,30); font-size:14.6667px; background-color:rgb(255,255,255); display:inline!important">> values change across the thresholds you configured. The key to</span><br style="color:rgb(32,31,30); font-size:14.6667px; background-color:rgb(255,255,255)">
<span style="color:rgb(32,31,30); font-size:14.6667px; background-color:rgb(255,255,255); display:inline!important">> understand is whether we can see the indications arriving when the</span><br style="color:rgb(32,31,30); font-size:14.6667px; background-color:rgb(255,255,255)">
<span style="color:rgb(32,31,30); font-size:14.6667px; background-color:rgb(255,255,255); display:inline!important">> values cross the threholds.</span><br>
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</span></div>
<div style=""><font color="#201f1e"><span style="font-size:14.6667px">Hardly, the modem is not plugged on a laptop but on an embedded machine that is slightly heavy (and connected with other things), but it makes think that I may test the modem on my own computer
to see what we got (my computer run an ubuntu 20.04 which ships ModemManager 1.16.6 like my target machine but with libqmi 1.28.6, good coincidence thus not exactly my target config), I'll try that this afternoon.</span></font></div>
<div style=""><font color="#201f1e"><span style="font-size:14.6667px"><br>
</span></font></div>
<div style=""><font color="#201f1e"><span style="font-size:14.6667px"><span style="background-color:rgb(255,255,255); display:inline!important">> Maybe switching to the signal info indications (as per the</span><br>
<span style="background-color:rgb(255,255,255); display:inline!important">> "newest QMI commands" logic) would make more sense, that is something</span><br style="background-color:rgb(255,255,255)">
<span style="background-color:rgb(255,255,255); display:inline!important">> that could also be investigated.</span><br>
</span></font></div>
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</span></span></font></div>
<div style=""><font color="#201f1e"><span style="font-size:14.6667px"><span style="background-color:rgb(255,255,255); display:inline!important">Do you mean by that I should try on my target machine with a patched ModemManager where WITH_NEWEST_QMI_COMMANDS
is enabled ?</span></span></font></div>
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</span></span></font></div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Aleksander Morgado <aleksander@aleksander.es><br>
<b>Sent:</b> Friday, October 1, 2021 11:41 AM<br>
<b>To:</b> Frederic Martinsons <frederic.martinsons@sigfox.com><br>
<b>Cc:</b> modemmanager-devel@lists.freedesktop.org <modemmanager-devel@lists.freedesktop.org><br>
<b>Subject:</b> Re: Signal quality not updated with Quectel EG25 through QMI</font>
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<div class="x_PlainText">><br>
> I did your suggested modifications (patches mm-broadband-modem-qmi.c) and it seems to change nothing (I keep getting my signal quality "cached" and I don't see "Signal Strength" indications beside in the beginning of modem initialization)<br>
><br>
<br>
If you cannot physically remove the antenna for the testing, can you<br>
at least move the modem around? You may also enable the extended<br>
signal interface with e.g. a 10s rate and see if the reported RSSI<br>
values change across the thresholds you configured. The key to<br>
understand is whether we can see the indications arriving when the<br>
values cross the threholds.<br>
<br>
I've looked around the code and there is also a warning I added a<br>
while ago regarding the amount of thresholds we can configure. Looks<br>
like we should not configure many because there are devices that don't<br>
like them, so we left 5 thresholds by default. I understand this may<br>
not be fully desirable, as it would mean just a few signal updates<br>
happening only when the values change a lot. The new suggested<br>
thresholds here should help to get more indications, but it may not be<br>
enough. Maybe switching to the signal info indications (as per the<br>
"newest QMI commands" logic) would make more sense, that is something<br>
that could also be investigated.<br>
<br>
<br>
-- <br>
Aleksander<br>
<a href="https://aleksander.es">https://aleksander.es</a><br>
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