Since this plugin uses a bitmask to represent bands, we have
to be wary of shifting outside the precision of the bitmask
storage type. In this case, it was possible to generate 1 << 31
in a signed integer type as an intermediate step of B3G_FLAG,
which is undefined behavior (and usually results in INT_MIN,
breaking comparisons with the value).
Bug was reported to the chromium tracker at crbug.com/1019301
Original patch updated by Aleksander Morgado to leave
MM_MODEM_BAND_TELIT_3G_LAST as MM_MODEM_BAND_UTRAN_19, as that is the
highest 3G band supported by the current implementation. Worth noting
that this was not a real bug as the maximum flag we would have been
setting was (1 << 19) anyway.
It was observed that sporadically it may take more than 5 seconds for modem to
respond to AT#REBOOT. Increase the timeout on AT command to not report
unnecessary errors to the user.
The SIM7600E ends up emitting these URCs with too many <CR>s, and the
generic +CRING handler doesn't catch them, interfering with other
actions, e.g.:
$ sudo mmcli --call 1 --accept
error: couldn't accept the call: 'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Failed: Couldn't accept the call: Unhandled response '+CRING: VOICE
+CRING: VOICE''
Just processing and parsing them for now, so that they don't interfere
with other commands:
$ sudo mmcli --call 1 --accept
error: couldn't accept the call: 'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Failed: Couldn't accept the call: Unhandled response '
VOICE CALL: BEGIN''
We will explicitly query for +AUTOCSQ and +CNSMOD support before
trying to enable them.
If +AUTOCSQ is supported and correctly enabled, we'll request signal
quality polling to be disabled.
If +CNSMOD is supported and correctly enabled, we'll request access
technology polling to be disabled.
The +AUTOCSQ setup enables automatic signal quality reporting via +CSQ
URCs, which unfortunately have the same format as the +CSQ command
responses.
Therefore, we need to subclass load_signal_quality() explicitly in
order to ignore those cases where the response to the +CSQ command is
received empty (already processed as a URC).
The logic to setup the generic +CIND indications in the SIM7600E seems
to end up breaking connectivity when in TTY+PPP mode. If we issue the
AT+CMER=3,0,0,1 command, this will end up in the modem not replying a
correct CONNECT response to the ATD command.
Let's disable these +CIND indications completely in the simtech
plugin, as there is even no AT command reference saying those are
supported.
Fixes https://gitlab.freedesktop.org/mobile-broadband/ModemManager/issues/144
