ModemManager using QMI doesnt always work in the first attemp.

[Dan Williams]

On Tue, 2015-11-17 at 18:10 +0100, José  wrote:
> Sorry for the delay.
> 
> This is the debug log for the Telit LE910 with a Vodafone SIM:
> http://pastebin.com/U7EBv8sr
> 
> The test case is:
> - Boot the device
> - Issue: mmcli -m 0 --simple-connect=apn=ac.vodafone.es
> This command returns: error: couldn't connect the modem: 'The
> connection is
> closed'

It actually looks like ModemManager is getting kicked off D-Bus, which
is usually caused by MM trying to send non-UTF-8 strings in a signal or
D-Bus reply...

Dan

> 
> On Thu, Nov 12, 2015 at 1:22 PM, Aleksander Morgado <
> aleksander at aleksander.es> wrote:
> 
> > On Thu, Nov 12, 2015 at 1:15 PM, José <Joseddg92 at gmail.com> wrote:
> > > 
> > > I am working with two different QMI modems (Telit LE910 and
> > > Sierra
> > MC7710 in QMI mode) and experimenting one issue with both of them.
> > > 
> > > After boot I try to establish the connection:
> > > 
> > > ModemManager &
> > > (wait for the modem to be detected)
> > > mmcli -m 0 --simple-connect="apn=.."
> > > 
> > > This somtimes works, but most of the time fails. However, when it
> > > fails,
> > issuing
> > > mmcli -m 0 --simple-connect="apn=.."
> > > always works.
> > > 
> > > I don't think it is related to the enviroment, because other
> > > modems (or
> > even the same Sierra MC7710 using MBIM or Direct IP) work fine.
> > > 
> > > The common error is this (complete logs at the end)
> > > 
> > > ModemManager[684]: [/dev/cdc-wdm0] No transaction matched in
> > > received
> > message
> > > 
> > > 
> > > What could be causing that?
> > 
> > 
> > Can you gather *debug* logs? Thanks!
> > 
> > 
> > --
> > Aleksander
> > https://aleksander.es
> > 
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