This string shows the runtime version of the ModemManager daemon.

https://gitlab.freedesktop.org/mobile-broadband/ModemManager/issues/94

If we have a modem reference around during an ongoing operation but
the modem has already been disposed after getting removed from the
system, we were trying to iterate a NULL hash table, which led to a
crash.

https://lists.freedesktop.org/archives/modemmanager-devel/2018-November/006915.html

Reported by Sebastien Fabre <sebastien.fabre@sigfox.com>

The +CGEV indications allow us to get notified of packet domain
events like network-initiated or ME-initiated disconnections on
specific connected contexts, as well as full PS detach events (all
contexts disconnected). If the modem supports these indications, we
will enable them with +CGEREP and will then process them when they are
emitted by the modem.

If a full PS detach event happens, we will explicitly disconnect all
connected bearers.

If a deactivation inidication is received for a single context, we
will look for the associated bearer by CID and explicitly disconnect
it.

libmbim 1.17.4 (commit 3eeaa4248b98 "ms-basic-connect-extensions: rename
service") added a MS prefix to the Basic Connectivity Extensions
service. This patch updates the MMBroadbandModemMbim code accordingly.

mm-modem-helpers.c:3075:31: error: comparison of unsigned expression >= 0 is always true [-Werror=type-limits]
     g_return_val_if_fail (idx >= 0, NULL);
                               ^

If a QMI modem doesn't support the deprecated DMS_UIM_GET_IMSI command,
use the UIM_READ_TRANSPARENT command to read EFimsi on the SIM to
determine the IMSI.

If a QMI modem doesn't support the deprecated DMS_UIM_GET_ICCID command,
use the UIM_READ_TRANSPARENT command to read EFiccid on the SIM to
determine the ICCID.

This patch adds a mm_bcd_to_string() helper function to convert a byte
array representing a binary-coded decimal (BCD) number to a string
representing the equivalent decimal number.