Re: Is it ok if ModemManager process is killed AFTER network-interface is brought up and IP-Address assigned?

[Ajay Garg <ajaygargnsit gmail com>]

Hi Alex.

Right now, the modem is being used in Direct-IP mode (using both
"sierra" and "sierra_net" drivers).
Have posted a query https://lkml.org/lkml/2016/8/11/135, specifying
the details, and having some queries.



On Thu, Aug 11, 2016 at 6:45 PM, Alex Ferm <aferm petropower com> wrote:
> From the specifications it looks like your modem has a QMI interface. I'm
> surprised ModemManager isn't using that. When ModemManager connects to a QMI
> modem it uses a proxy, which allows multiple applications to access the
> interface.
>
> Alex Ferm
> PetroPower, LLC.
> 3003 E. 37th Street N.
> Suite 100
> Wichita, KS 67219
>
> Phone: (316) 361-0222
> Toll Free: (877) 265-6581
> Fax: (316) 361-0967
>
> On 08/10/2016 12:36 AM, Ajay Garg wrote:
> > I might point that if I comment the "respawn" option in
> > "/etc/init/modemmanager.conf" and then start the modem-manager binary
> > from command-line, the broadband connection gets disconnected as soon
> > as I exit the binary.
> >
> > So, I guess the answer to my question is "no", but just want to confirm.
> > Also, if the answer is in fact "no", is there a way to change the answer?
> >
> > On Wed, Aug 10, 2016 at 10:00 AM, Ajay Garg <ajaygargnsit gmail com>
> > wrote:
> > > Any pointers, please?
> > >
> > > On Tue, Aug 9, 2016 at 12:46 PM, Ajay Garg <ajaygargnsit gmail com>
> > > wrote:
> > > > Hi All.
> > > >
> > > > We are using Sierra's USB-to-WWAN driver on Ubuntu-14 for Sierra's
> > > > MC8090
> > > > modem, and we have a requirement wherein we need to have access to the
> > > > modem-serial-port (from our user-application that is).
> > > >
> > > > Right now, we see that /usr/sbin/ModemManager is always connected to
> > > > /dev/ttyUSB3 (which means we cannot connect to the port from our
> > > > application
> > > > at the same time, or even if we can, received-data will be at best
> > > > inconsistent).
> > > >
> > > >
> > > > We are thinking of the following ::
> > > >
> > > >              * Initially, let nmcli and ModemManager do their work, and
> > > > let
> > > > them bring the WWAN interface up.
> > > >
> > > >              * Once this happens, we permanently-down the ModemManager
> > > > from
> > > > our application-binary, thereby freeing up /dev/ttyUSB3.
> > > >
> > > >              * Thereafter, we are free to connect to /dev/ttyUSB3 from
> > > > our
> > > > application, thereby using features like SMS-notification (+CMTI),
> > > >                signal-strength (+CSQ), etc.
> > > >
> > > >
> > > >
> > > > Does our approach make sense?
> > > > We will be grateful to any help.
> > > >
> > > >
> > > > Thanks and Regards,
> > > > Ajay
> > >
> > >
> > >
> > > --
> > > Regards,
> > > Ajay
>
>
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-- 
Regards,
Ajay