Re: Modem Initialization

[Vincenzo Romano <vincenzo romano notorand it>]

2011/4/14 Dan Williams <dcbw redhat com>:
> On Thu, 2011-04-14 at 16:20 +0200, Vincenzo Romano wrote:
>> 2011/4/14 Aleksander Morgado <aleksander lanedo com>:
>> >
>> >> >> > Where on earth happens the modem initialization in NetWorkmanager?
>> >> >> > My interest is for GSM/3G modems as well as for POTS/ISDN modems.
>> >> >> > I've tried to browse the source code but it's quite difficult.
>> >> >> >
>> >> >>
>> >> >> What I've found so far is that the initialization is done in the modemmanager.
>> >> >> It looks like it's hardcoded, which looks quite weird to me.
>> >> >> I do need to make some extra optional initialization: is there any
>> >> >> hook for such a
>> >> >> need?
>> >> >
>> >> > ModemManager has some generic setup steps, plus 'plugins' for each
>> >> > modem/vendor known to make things differently. If your modem needs
>> >> > specific AT commands during initialization, you'll probably need to
>> >> > develop a new plugin for it.
>> >> >
>> >> > Cheers,
>> >>
>> >> Among other things, I'd need to harvest the localization information (AT+CREG)
>> >> from GSM/3G modems. 99.999% of such modems implement it but I don't see
>> >> how to do it.
>> >>
>> >> Any idea?
>> >
>> > I believe the generic plugin already harvests location area code and
>> > cell ID whenever available in the AT+CREG? reply. Although I never tried
>> > it myself, you can possibly use the GetLocation() method in the
>> > org.freedesktop.ModemManager.Modem.Location interface (once enabled with
>> > the Enable() method).
>> >
>> > Cheers!
>>
>> That sounds great. But also needs that I have to write my own D-Bus
>> code in order
>> to enable and retrieve the localization data (lac/ci).
>
> Ok, what exactly are you trying to do here?  If you can explain that,
> then maybe we can say what the best course of action here is.  What
> specific initialization commands do you need to send?
>
> Yes, MM exposes location information via the D-Bus interface, because
> that's how *all* of MM's interaction with the system works, via D-Bus.
>
>> And, finally, for the other things I need to do there's no way at all.
>
> Such as?  What kinds of things do you need to do?
>
> Dan
>
>> I've given a look at the modemmanager code and there seems to be no
>> hook available
>> to send AT commands before the connection or after it ended.

For mobile boradband I need to get some network related infos,
localization (LAC+CI) among them.
What I understand is that I need to write a D-BUS client to ask
the modem manager to gather the infos on my behalf.
But for POTS and ISDN modem I just need to make some specific
initialization which apperas to be not possible at all.

-- 
Vincenzo Romano at NotOrAnd Information Technologies