Not all Cinterion modems support AT+CESQ.
However a much larger group of them support AT^SMONI
This commit uses the latter instead of the default former.
This command will give us URCs whenever the extended list of current
calls changes, which includes information about the actual state of
each call, even for calls in waiting state.
Therefore, as this is a URC that applies to all calls, it's enabled
and disabled as part of the modem voice interface, instead of doing it
as part of the call object itself (i.e. not treated as an in-call URC).
If the modem supports ^SIND psinfo reporting, we enable the URC and
flag the access technology polling unsupported, so that we only update
access technology via the +CIEV URCs.
E.g.:
(ttyACM1): --> 'AT^SIND="psinfo",1<CR>'
(ttyACM1): <-- '<CR><LF>^SIND: psinfo,1,10<CR><LF><CR><LF>OK<CR><LF>'
Reporting initial access technologies...
Modem /org/freedesktop/ModemManager1/Modem/0: access technology changed (unknown -> hsdpa, hsupa)
...
(ttyACM1): <-- '<CR><LF>+CIEV: psinfo,4<CR><LF>'
Modem /org/freedesktop/ModemManager1/Modem/0: access technology changed (hsdpa, hsupa -> edge)
...
* Allow whitespaces prefixing the values row.
* Allow more than one \r\n between the title and the table header.
Reported-by: Colin Helliwell <colin.helliwell@ln-systems.com>
We get as input the ^SWWAN index we're interested in, and we loop
through the list of ^SWWAN lines looking for the one we need.
This updated helper method allows working with multi-line ^SWWAN
responses, e.g. given when more than one PDP context is active.
