Hello Aleksander, > 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. -- Kind regards, Alejandro Vega
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