Re: AW: pppd gets no IP during dial-in with Sierra MC7710 qmi

[Bjørn Mork <bjorn mork no>]

Andreas Schigold <andreas schigold blankom de> writes:

> > Marius Kotsbak <marius kotsbak com> writes:
> > > Den 08. mars 2013 14:59, skrev Bjørn Mork:
> > > > Marius Kotsbak <marius kotsbak com> writes:
> > > > > Den 08. mars 2013 13:07, skrev Bjørn Mork:
> > > > > > > Or does it working just with the QMI-WWAN driver via the 
> > > > > > > /dev/cdc-wdm
> > > > > > > > file? To make the libqmi useable makes a lot of work since I need 
> > > > > > > > some other libs as prerequisite for this. At this moment they are 
> > > > > > > > not included in the buildroot-project.
> > > > > > The MC7710 is fully usable with PPP so you don't need QMI if you 
> > > > > > can live with the speed penalty.
> > > > >
> > > > > My experience is that it does not work with just AT commands when it 
> > > > > is in QMI mode, so I would instead look into libqmi.
> > > >
> > > > PPP works fine in QMI mode. AT!SCACT etc does not.
> > >
> > > I refer to usage of Network-/Modem manager. It might be that they use 
> > > some features not available in QMI mode.
> >
> > Ah, right, I should check the context before replying :)
> >
> > Bjørn
>
> Now you lost me :(
> Should pppd with AT-commands can connect with this modem and firmware or can't it?

ppp can connect, but maybe not with ModemManager.  I'll have to trust
Marius on that.  Haven't tried...

> If it can't work:
> Do I need definitively libqmi or must the gobi-lib work too?
>
> I know the network-manager from my Debian-desktop-PC. But at this
> embedded system I have no X-server. Is it working too? Or do I have to
> analyze the source to develop my own programm?

NetworkManager and ModemManager are dbus-based daemons and should work
fine on embedded systems.  See e.g Aleksanders work on OpenWRT:
http://sigquit.wordpress.com/2013/02/14/modemmanager-and-latest-udev-in-openwrt/

> Another question: Is it important for dialin-procedure if I have an
> access-point with LTE or UMTS? Or does it no matter? - except speed of
> course ;)

Does not matter.  The firmware hides the configuration differences.
You'll see them if you start messing with the radio network QoS
settings, but most users won't care about those.

> Speed is the second goal. The first goal is to get it working. At this
> moment we use the AT91Sam9G20 which have just USB 1.1. The plan is to
> upgrade later to the ~G25 with USB 2.0. Only then a faster solution is
> needed, but then we have more time.

In my very limited experimenting I could never get more than ~8Mbits/s
uplink with PPP.  I get >30 Mbits/s up using the same MC7710 card with
any of the supported network interface protocols (DirectIP, QMI, MBIM).


Bjørn