Re: Modem Initialization

[Vincenzo Romano <vincenzo romano notorand it>]

2011/4/18 Vincenzo Romano <vincenzo romano notorand it>:
> 2011/4/18 Vincenzo Romano <vincenzo romano notorand it>:
>> 2011/4/15 Dan Williams <dcbw redhat com>:
>>> On Fri, 2011-04-15 at 12:37 +0200, Vincenzo Romano wrote:
>>>> 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.
>>>
>>> That's correct.  There's a python example of this in ModemManager's
>>> test/location.py script that enables location services on the modem and
>>> reports the LAC/CI for you.  That should give you an idea of the D-Bus
>>> interfaces required to get the LAC/CI out.  Note that the SIM PIN must
>>> have been entered, and the modem enabled, before location services can
>>> work, because no modem will register with the network until it's (a) PIN
>>> unlocked and (b) powered up.  Regardless of whether MM is used or not.
>>>
>>>> But for POTS and ISDN modem I just need to make some specific
>>>> initialization which apperas to be not possible at all.
>>>
>>> ModemManager does not (yet) handle POTS modems and will ignore them.
>>> Nor does MM handle ISDN since ISDN doesn't really look like a modem and
>>> doesn't get configured like one either.  ISDN would probably be handled
>>> by NetworkManager instead.
>>>
>>
>> Hi.
>> Neither in ModemManager-0.4 nor in NetworkManager-0.8.3.999 there's
>> any location.py.
>> Could you please tell me where can I read such a piece software?
>> That looks promising, though.
>
> Found!
> It's not in the official distribution :-(
> It's here: http://cgit.freedesktop.org/ModemManager/ModemManager/tree/test

The only thing I've got so far is:

~ ./location.py
Traceback (most recent call last):
  File "./location.py", line 32, in <module>
    proxy = bus.get_object(MM_DBUS_SERVICE, sys.argv[1])
IndexError: list index out of range


I'm not a Python programmer but it looks like there's a missing
argument (the 1st one?) in the command line.
Could you please direct me to where I can get more details about this program?
I need also to understand whether this service can be requested with
the modem being online or needs to
be required *before* going online.

Thanks a lot again.