[Freeswitch-users] SIM7100 LTE modem with USB audio

Thu Aug 3 13:51:24 UTC 2017

On 31 July 2017 at 02:43, Stanislav Sinyagin <ssinyagin at gmail.com> wrote:

> Greetings,
>
> I started slowly outlining a new module, mod_ttyusb_audio. It will do
> a simple task by bridging a channel with a specified /dev/ttyUSBx PCM
> flow using a specified codec (All modems that I know use the same L16
> at 8kHZ, but who knows what other codecs there might be). As I didn't
> yet find a sponsor for this development, it goes quite slowly.
>
> as far as i know they all use L16 so no biggie there.

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 ?

> 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

>
> 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 ?

> 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
:=)

>
>
> cheers,
> stanislav
>
>
>
>
>
>
>
>
> On Sun, Jul 30, 2017 at 6:08 PM, Tihomir Culjaga <tculjaga at gmail.com>
> wrote:
> > Hi Stanislav, I like the idea!
> >
> > i'd prefer to have a separate module (not some perl daemon)  tho.
> >
> > you can instruct udev to run an external program to name devices ( a
> simple
> > rpc to stdout would to great ) . This way you can specify dongles
> (vendorID,
> > productID, interfaceNumber, dongleSerial...) in your module config and
> let
> > your module name the ttys accordingly.
> >
> > The module should have AT command mappings for preInit, Init, postInit,
> > dongle_events ( incoming call, ring,...), basic commands ( answer,
> > hangup...) exposed all in config...
> >
> > This is where it gets ugly (and a bit less secure), but to keep the
> module
> > code sane, its better to expose AT mappings in config.
> >
> > Once the "signaling" is done, the module should notify mod_portaudio ( a
> > fork of ) what audio tty it should sit on for the given call
> >
> >
> > well in theory :=)
> > i see a lot of work ahead..
> >
> >
> >
> > On 27 July 2017 at 00:41, Stanislav Sinyagin <ssinyagin at gmail.com>
> wrote:
> >>
> >> I looked inside gsmopen_protocol.cpp and my eyes hurt. It has so many
> >> hardcoded vendor-specific commands, and it does not know the actual
> >> vendor that it speaks to. I really don't like adding more bad code
> >> here.
> >>
> >> I'm inclining to have a Perl daemon working the AT commands via the
> >> control UART ports, and telling FreeSWITCH take the audio channel from
> >> the audio UART port when it's ready. I think mod_portaudio should do
> >> the job after minor modifications.
> >>
> >> Then the AT command handler can be written in a modern and modular
> >> fashion, with independent modules for different hardware.
> >>
> >> Also this way we would open the door for new hardware solutions which
> >> are able to send/receive PCM via ttyUSB ports. Then, for example, one
> >> may build a hardware phone with it :)
> >>
> >>
> >>
> >>
> >>
> >> On Wed, Jul 26, 2017 at 1:54 AM, Stanislav Sinyagin <
> ssinyagin at gmail.com>
> >> wrote:
> >> > I assembled the lab, and will start digging the code tomorrow.
> >> >
> >> > The modem sends PCM audio via an UART USB device, just like Huawei
> >> > dongles
> >> > do. So, it looks like only a matter of accommodating to vendor and
> >> > product
> >> > codes and initialization strings.
> >> >
> >> >
> >> >
> >> > On 25 Jul 2017 15:10, "Giovanni Maruzzelli" <gmaruzz at gmail.com>
> wrote:
> >> >>
> >> >>
> >> >>
> >> >> On 23 July 2017 at 10:17, Stanislav Sinyagin <ssinyagin at gmail.com>
> >> >> wrote:
> >> >>>
> >> >>> Hi Giovanni, I only had time to configure it for Internet access:
> >> >>>
> >> >>> https://txlab.wordpress.com/2017/07/23/simcom-sim7100e-lte-modem/
> >> >>>
> >> >>> The benefit is mPCIe interface, so it can be placed inside and
> >> >>> enclosure.
> >> >>> No silly dongles any more :)
> >> >>>
> >> >>> I'll tinker with voice some time later. I can also provide you SSH
> >> >>> access
> >> >>> if you wish to work on gsmopen update.
> >> >>
> >> >>
> >> >> Please, let me know if any progress or so.
> >> >>
> >> >> Will not be so easy to interface audio to it via USB, will need to
> >> >> create
> >> >> a kernel driver, or use a userspace USB lib and create a user space
> >> >> driver.
> >> >>
> >> >> Happy hacking!
> >> >>
> >> >> -giovanni
> >> >>
> >> >>
> >> >>
> >> >>>
> >> >>>
> >> >>>
> >> >>>
> >> >>> On 21 Jul 2017 18:36, "Giovanni Maruzzelli" <gmaruzz at gmail.com>
> wrote:
> >> >>>>
> >> >>>> Hello Stanislav,
> >> >>>>
> >> >>>> have you had time to tinker with it?
> >> >>>>
> >> >>>> How it goes?
> >> >>>>
> >> >>>> Also, why you would prefer this one instead of the already
> supported
> >> >>>> ones?
> >> >>>>
> >> >>>> -giovanni
> >> >>>>
> >> >>>>
> >> >>>> On 8 July 2017 at 21:28, Stanislav Sinyagin <ssinyagin at gmail.com>
> >> >>>> wrote:
> >> >>>>>
> >> >>>>> Simcom has recently released a new 4G/LTE modem, and it has USB
> >> >>>>> audio
> >> >>>>> support.
> >> >>>>> You can find sim7100_usb_audio_application_note_v0.01.pdf   with
> >> >>>>> details at the vendor site, or at techship.com  after
> registration.
> >> >>>>>
> >> >>>>> It transmits 8kHZ, 16-bit PCM audio via a USB UART simulation.
> >> >>>>>
> >> >>>>> So, in theory, gsmopen module may be adapted to it (or maybe a new
> >> >>>>> module is worth starting).
> >> >>>>>
> >> >>>>> I ordered a sample, will check it out soon.
> >> >>>>>
> >> >>>>> cheers,
> >> >>>>> stanislav
> >> >>>>>
> >> >>>>>
> >> >>>>>
> >> >>>>> ____________________________________________________________
> _____________
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> >> >>>>>
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> >> >>>>>
> >> >>>>> FreeSWITCH-users mailing list
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> >> >>>>
> >> >>>>
> >> >>>>
> >> >>>>
> >> >>>> --
> >> >>>>
> >> >>>> Sincerely,
> >> >>>>
> >> >>>> Giovanni Maruzzelli
> >> >>>> OpenTelecom.IT
> >> >>>> cell: +39 347 266 56 18
> >> >>>>
> >> >>>>
> >> >>>>
> >> >>>> ____________________________________________________________
> _____________
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> >> >>>> consulting at freeswitch.org
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> >> >>>>
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> >> >>>>
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> >> >>>
> >> >>>
> >> >>>
> >> >>> ____________________________________________________________
> _____________
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> >> >>>
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> >> >>
> >> >>
> >> >>
> >> >> --
> >> >>
> >> >> Sincerely,
> >> >>
> >> >> Giovanni Maruzzelli
> >> >> OpenTelecom.IT
> >> >> cell: +39 347 266 56 18
> >> >>
> >> >>
> >> >> ____________________________________________________________
> _____________
> >> >> Professional FreeSWITCH Consulting Services:
> >> >> consulting at freeswitch.org
> >> >> http://www.freeswitchsolutions.com
> >> >>
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> >> >> http://www.cluecon.com
> >> >>
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> >> ____________________________________________________________
> _____________
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> >>
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> >>
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> >
> >
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