On Fri, Dec 6, 2019 at 9:11 AM Ulrich Mohr <u.m...@semex-engcon.com> wrote: > > Hi, > > I am not sure, but I think that this is a problem with the UBlox modems I was > facing before with a TOBY 210. > > The problem is that the modem does an automatic registration on the LTE > network using its default APN (that it gets from the network, when I > understand right). That is what you see (m2m.com.attz.mnc170.mcc310.gprs) as > context 4: (which is the default LTE bearer on TOBY). Unfortunately, that > does not match the one your have given manually, so ModemManager tries to > build up a connection using the secondary context with the APN settings you > have given -- which fails, because the service provider does not allow a > secondary connection while the first one is active. > > What I am not completely clear about is, under which circumstances you get > such a long default APN name (not matching the 'official' ones) from the > network. >
The "long" name you get is when the bearer is already connected to that APN, so the name includes the MCCMNC of the operator. ModemManager already does a "loose" matching of the APNs and they should already match that one in context 4 if available: https://gitlab.freedesktop.org/mobile-broadband/ModemManager/blob/master/src/mm-modem-helpers.c#L1506 As you said, MM should have attempted to use context #4 instead of #1 as #4 was already connected. The problem is that the logic looking for which context to use stops as soon as it finds a matching one, and in this case it found #1 before #4. We could extend the logic to "prefer" an APN that is reported with MCCMNC if there are more than one matching, and I believe that should work. > @Aleksander: See > https://lists.freedesktop.org/archives/modemmanager-devel/2018-August/006633.html > > I heavily change the ublox plugin to work around that -- unfortunately I > never found the time to bring it to a deliverable state, and at the moment, I > can't even remember what exactly I did. But I can provide the sources if > needed.... Yes, please, can you do that? -- Aleksander https://aleksander.es _______________________________________________ ModemManager-devel mailing list ModemManager-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/modemmanager-devel
