Architectural-Queries on integrating Sierra-MC8090 with Linux

[Benoit Donnette]

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
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