Architectural-Queries on integrating Sierra-MC8090 with Linux

[Ajay Garg]

Thanks Benoit for the reply.

I wrote this email, when I was absolutely clueless as to how things fit in.
Fortunately, through the help of MM and NM mailing lists, I have been
successful in achieving what I wanted.

For other people who might be going through the pain (I know it really
hurts), here are the broad-level steps I followed ::

a)
Changed the modem to QMI-mode.

https://forum.sierrawireless.com/viewtopic.php?f=117&t=6759#p28436
https://lists.freedesktop.org/archives/modemmanager-devel/
2016-August/003303.html


b)
Ensured that ModemManager was a fairly recent-one.

https://launchpad.net/~aleksander-m/+archive/ubuntu/modemmanager-trusty
sudo apt-get install modemmanager


c)
Let the kernel use qcserial/qmi_wwan/qmi-proxy to load /dev/cdc-wdm...
interface, to set up communication in manner ::

             Any-User-App <=> ModemManager <=> qmi-proxy <=> /dev/cdc-wdm
.. <=> modem
                                                 ^
                                                 ||
                                                 V
                                              mmcli

Then use mmcli for setting up connections manually.

Detailed Q&A in
https://lists.freedesktop.org/archives/modemmanager-devel/2016-August/003292.html
thread.


Thanks and Regards,
Ajay


On Tue, Aug 16, 2016 at 12:43 PM, Benoit Donnette <benoit.donnette at 21net.com
> wrote:

> Answering through ModemManager, for this is where the code uses the
> /dev/ttyUSBx device.
>
> Well, if you want to have a modem connection up and ready through
> NetworkManager/ModemManager, they're doing the job, and you won't need to
> access the device anyway. This is obviously not what you're doing, so I'd
> say let the ModemManager off this modem.
>
> If you're trying to establish a socket connection to a server, then it
> looks like you're trying to use the modem as a data connection still. Then
> ModemManager makes what you want...
>
> So, if you're trying to use the modem as a data carrier,
> ModemManager/NetworkManager do all the unpleasant part for you, what is
> your reason for accessing the device ? You possibly need no more that a few
> lines of C to have an elementary multiplexer on your device (and set up MM
> to use the multiplex instead of ttyUSBx).
>
>
> On Thu, Aug 11, 2016 at 4:03 PM, Ajay Garg <ajaygargnsit at gmail.com> wrote:
>
>> CCing NM and MM guys.
>>
>> On Thu, Aug 11, 2016 at 2:23 PM, Ajay Garg <ajaygargnsit at gmail.com>
>> wrote:
>> > Hi All.
>> >
>> > Have posted the question on Sierra-forums
>> > https://forum.sierrawireless.com/viewtopic.php?f=117&t=9898
>> > Posting it here as well, as the activity there is relatively low, and
>> > this is where all the kernel-guys hand :)
>> >
>> >
>> > I am using a Ubuntu interfaced with a Sierra-MC8090 module.
>> >
>> > Right now MC8090 is identifed as a network-interface on Linux, made
>> > possible by the usage of "sierra" (serial-driver) and "sierra_net"
>> > (direct-ip usb-to-wwan driver) kernel-drivers. This "mostly" works,
>> > except that we, in the user-application, are not able to access the
>> > serial-file /dev/ttyUSB3 (this file is in constant usage by
>> > /usr/sbin/ModemManager).
>> >
>> > Now, my question is, if we disable loading the "sierra_net" driver,
>> > and use just "sierra" driver to communicate on the serial-port, will
>> > using the Sierra-Linux-QMI-SDK do the job? In particular,
>> >
>> > *
>> > I understand that we will now have exclusive access (please correct me
>> > if I am wrong) to the serial-port /dev/ttyUSB3.
>> >
>> > *
>> > How to do we create a socket to a particular server-port using the
>> > QMI-SDK? I can see in the examples that we can start a data-call for a
>> > profile (ConnectGSM.c), but I am unable to find how to instantiate a
>> > socket through which we can do regular reads/writes.
>> >
>> >
>> > Will be grateful to hear back from someone.
>> >
>> >
>> > Thanks and Regards,
>> > Ajay
>>
>>
>>
>> --
>> Regards,
>> Ajay
>> _______________________________________________
>> networkmanager-list mailing list
>> networkmanager-list at gnome.org
>> https://mail.gnome.org/mailman/listinfo/networkmanager-list
>>
>
>


-- 
Regards,
Ajay
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