Hey Alex, > > > > On Mon, Feb 19, 2024 at 2:31 AM Alex Villacís Lasso > > <a_villa...@palosanto.com> wrote: > >> El 16/2/24 a las 17:48, Alex Villacís Lasso escribió: > >>> I have this old phone, a Samsung E3210B pre-Android feature phone that > >>> I wish to use as a fallback option when (more frequently than I would > >>> like) my broadband internet service goes down. When using ModemManager > >>> 1.18.x, I could plug in this phone, and it would expose a single > >>> /dev/ttyACM0 port for all interactions including AT commands and PPP. > >>> Then ModemManager could connect to the internet using the port as > >>> normal, using the "generic" plugin. Now, using ModemManager 1.20.6 > >>> under Fedora 39, the same phone fails (with a timeout) to establish a > >>> connection using ModemManager. However, it does setup a proper > >>> connection using wvdial from the command line, even under Fedora 39. > >>> > >>> After a while, I managed to perform a git bisect on the code, and > >>> pinpointed the first commit that breaks my phone, to commit > >>> 213cd81b3ade35024e2d702e2726273f00344185 "iface-modem-simple: wait for > >>> packet service 'attach' state in ConnectionStep". However, I am now at > >>> a bit of a loss at understanding the supposed purpose of this commit. > >>> Full details are at this bug report: > >>> > >>> https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/743 > >>> > >>> The patch no longer cleanly reverts under 1.20.x, so I cannot just rip > >>> it off... > >>> > >> I have updated the bug report with a new discovery: ModemManager 1.20 > >> will dial into the phone immediately, if I first manually select some > >> phone feature that requires Internet access (such as Google Search), > >> then click OK in the little dialog that ask to connect to the Internet. > >> However, this manual interaction with the phone should be unnecessary, > >> because it was not needed with ModemManager 1.18 and is also not needed > >> when using the phone through wvdial. > >> > >> I need a way to tell ModemManager when using this particular phone to > >> connect, to IGNORE the "searching" status of the GPRS registration and > >> dial anyway, since the GPRS will be enabled by the very act of dialing > >> the Internet access sequence. Is there any existing way to do that? > >> > > I replied at the issue, I believe your problem would be solved with MM > > 1.22 and > > https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/commit/179a800ab64b28f5437c3d06056640f702e68aa5. > > You may still experience some delay to connect, because MM will first > > wait some seconds for the attach state to come up automatically, and > > only otherwise try to send the operation to activate it. > > > > Either way, it looks like your device needs a much more relaxed logic > > in this regard, so fully ignoring the packet service attach state > > would be a better option probably. > > > > I have updated the bug report. With ModemManager 1.22 on Fedora 40, the > phone is not even recognized as a valid modem, even though wvdial > continues to work with it. On a separate machine using Debian Testing > (Trixie) with the same minor version (1.22) the problem also exists. >
Would you be able to gather MM debug logs and post them? -- Aleksander
