Hey, >> > I am developing an application making use of libmm-glib high level API and >> > I am using a EM7455 Sierra Wireless modem. The modem is working under MBIM >> > mode (usb-composition). >> > >> > I believe the issue I am experiencing is related to the change of operator >> > / SIM card. The scenario is the following: >> > >> > The first SIM card I introduce is able to register in the network and >> > connect using the APN I specify in order to establish a connection. >> > I tell the modem to change the SIM card via internal AT command and I >> > perform a system reboot (just to ensure everything starts fresh) >> >> With system reboot you mean a modem reboot? Or a host system reboot? > > > I have tried both, but the one I usually do is a host system reboot to ensure > a system fresh start. > >> >> > After the reboot and after waiting some time (>5-10 minutes) the Modem is >> > not able to register in any network and the signal quality is never >> > updated. >> >> As you said, this should have been automatic. There's no state stored >> in MM that would affect this IF you did a full host system reboot OR a >> full modem reset. In both those cases, any state associated with the >> earlier exposed modem would have gone. >> >> To me this looks like a problem with the actual SIM card. Have you >> tried to start with that 2nd SIM card first, and switch to the >> original one to see what happens? > > > Ok, it's good to know that the Modem Manager does not store any > APN/connection-related information between reboots. > However, whenever I try to do what you mention I find similar issues. What I > experiment is that I am only able to connect using the SIM I have introduced > in the first place. > It does not matter if I make a reboot, that will be the SIM with which I will > be able to connect no matter I try to use it in first place or second (like > if the modem stored some APN/connection info) > > I will make some more tests but it seems it may be a Modem issue. >
Instead of doing a full host system, you should do a modem reset instead, because a full host system does not guarantee a modem reset implicitly, as the modem may be powered separately. -- Aleksander https://aleksander.es _______________________________________________ ModemManager-devel mailing list ModemManager-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/modemmanager-devel