[Freeswitch-users] SIM7100 LTE modem with USB audio

[Anthony Minessale]

Maybe a dictionary of abstract commands to translate to the vendor specific
like procomm used to do.

Then only issue the abstract commands from the high level and allow it to
translate.




On Thu, Aug 3, 2017 at 9:24 AM Stanislav Sinyagin <ssinyagin at gmail.com>
wrote:

> On Thu, Aug 3, 2017 at 3:51 PM, Tihomir Culjaga <tculjaga at gmail.com>
> wrote:
> > how are you going to instruct mod_ttyusb_audio top open audio channel on
> a
> > specific tty ? are you planing to provide the api in ESL ?
>
> a command like "ttyusb connect /dev/ttyUSB3 <uuid>"
>
> before that, a command "ttyusb device /dev/ttyUSB3 8000 L16" would
> tell the module what codec to use.
>
> After the call is finished, issue "ttyusb disconnect /dev/ttyUSB3", or
> it would disconnect automatically when the channel is destroyed.
>
>
> >> Once it's done, the signaling could be done either within FreeSWITCH,
> >> or in an outside ESL daemon. An external daemon would allow more
> >> flexibility, but there's a burden of running one more process.
> >
> >
> > although it can be much more flexible and faster using an external ESL
> > daemon, i'd prefer to make it in FreeSWITCH as a module ... e.g.
> mod_hayes
>
> the commands are very different for different vendors (I compared
> Huawei against Simcom, and it's a lot of difference), so there should
> be some vendor-specific extensions. Either a rich XML file defining
> the whole dialogue, or a per-vendor module in FreeSWITCH. Difficult to
> say, I'm not that far yet.
>
> >> In regards to udev rules -- you actually don't need them. The logic of
> >> finding the modem and matching it against IMEI and IMSI is already in
> >> mod_gsmopen (was that Giovanni who implemented it?). It just needs a
> >> bit of improvement in making it more vendor-independent. Also I would
> >> do matching on IMEI OR IMSI, not the AND condition that is in the
> >> module currently.
> >>
> > are we sure IMEI and/or IMSI will always present ?
>
> yes, as per GSM standard. But again, commands retrieving them are
> different between vendors. And anyway, that would only be one method
> of selecting a device. There should always be a way to point to a
> specific ttyUSB device explicitly.
>
> >> I actually do have a set of udev rules, they are in fact needed for
> >> data connection:
> >> https://github.com/ssinyagin/wwan_udev_rules
> >> But they fail if you have more than one modem, and here's an
> explanation:
> >>
> >>
> https://txlab.wordpress.com/2017/05/19/two-lte-modems-with-pc-engines-apu3/
> >
> >
> > this is specific HW :=) .. im positive there is a work around this
> problem
>
> no, this is a generic problem, and a solution for a specific host hardware.
>
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-- 
Anthony Minessale II       ♬ @anthmfs  ♬ @FreeSWITCH  ♬

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