PPP modem differences

[Dan Williams]

On Wed, 2017-03-22 at 14:41 +0000, Colin Helliwell wrote:
> > On 22 March 2017 at 13:50 Dan Williams <dcbw at redhat.com> wrote:
> > 
> > On Wed, 2017-03-22 at 13:23 +0000, colin.helliwell at ln-systems.com
> > wrote:
> > 
> > > I know this might not be an issue with MM, but as there's also a
> > > lot
> > > of
> > > modem-savvy people here.. :)
> > > 
> > > I've got the same system trying to make a ppp connection via MM.
> > > I'm
> > > using
> > > the same SIM card, and running
> > >  mmcli -m 0 --simple-connect="apn=mobile.o2.co.uk"
> > >  pppd nodetach call provider
> > 
> > Quite puzzling; I haven't seen these kinds of requests originating
> > from
> > the modem before. But some thoughts:
> > 
> > 1) same modem hardware? If so, same firmware? If not, I wouldn't be
> > surprised that different hardware is working differently, though I
> > haven't seen these kind of challenges from the modem before.
> > 
> 
> Nope - both Cinterion, but different models.

That would do it.

> > 2) Modems do store some state in NVRAM. Sometimes that can include
> > things like the default authentication mechanism (CHAP vs. PAP vs.
> > none). Perhaps your second device has a different setting for that
> > PDP
> > context; what does AT+CGDCONT=? say between them?
> > 
> 
> I'd looked at those, and they seemed sane (as far as they go).
> Working:
> mmcli -m 0 --command="AT+CGDCONT?"
> response: '+CGDCONT: 1,"IP","wap.vodafone.co.uk","0.0.0.0",0,0
> +CGDCONT: 2,"IPV4V6","wap.vodafone.co.uk","",0,0'
> [MM log showed cid 1 being used in the AT*99]
> 
> Non-working:
> mmcli -m 0 --command="AT+CGDCONT?"
> response: '+CGDCONT: 1,"IP","wap.vodafone.co.uk","0.0.0.0",0,0'

What do you get for AT^SGAUTH? for both devices?

Dan

> I'm not sure where/when the 0.0.0.0 got inserted in the Working one.
> It *wasn't* there to start with on the non-working one, so when I saw
> that diff I re-configured to add it. But not working with nor without
> that field.
> 
> > I assume these are Cinterion devices? Might be able to use some
> > Cinterion AT commands to figure out if there are settings
> > differences.
> > 
> 
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