El 3/3/24 a las 03:14, Aleksander Morgado escribió:
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.
