Hey,

> > Could you try requesting for an IP4-only connection (flagging as
> > disabled the IPv6 settings explicitly)? Looks like the IPv4 setup
> > succeeds and the IPv6 setup fails. Not saying that is the only fix
> > needed, because I believe the modem should allow the IPv4 setup even
> > if the IPv6 fails, but who knows.
>
> I just disabled IPv6 which makes the CallFailed errors disappear from the 
> ModemManager log. The NetworkManager still hangs at the DHCP step though. How 
> is this supposed to work with QMI modems? Does NetworkManager send a DHCP 
> discover via the data connection or is there some sort of interaction between 
> libqmi and NetworkManager?
>

The flow with QMI modems is simple:
 * MM connects the modem using "QMI WDS Start Network".
 * NetworkManager runs a DHCP client on the network interface.
And that's it.

I wonder if your setup has a 802.3 vs raw-ip mismatch in the network
interface. Could you gather the full debug log of MM to see the
details?
https://www.freedesktop.org/wiki/Software/ModemManager/Debugging/

> I wonder if this has anything to do with those errors or what they’re caused 
> by:
>
> couldn't load SIM identifier: 'Couldn't get UIM ICCID: QMI protocol error 
> (94): 'NotSupported''
> couldn't load IMSI: 'Couldn't get UIM IMSI: QMI protocol error (94): 
> 'NotSupported''
> couldn't load list of Own Numbers: 'Couldn't get MSISDN: QMI protocol error 
> (16): 'NotProvisioned''
> could not load SIM identifier: Couldn't get UIM ICCID: QMI protocol error 
> (94): 'NotSupported' (3 retries left)
> could not load SIM identifier: Couldn't get UIM ICCID: QMI protocol error 
> (94): 'NotSupported' (2 retries left)
> could not load SIM identifier: Couldn't get UIM ICCID: QMI protocol error 
> (94): 'NotSupported' (1 retries left)
> could not load SIM identifier: Couldn't get UIM ICCID: QMI protocol error 
> (94): 'NotSupported'
> Error checking if SIM was swapped: 'Couldn't get UIM ICCID: QMI protocol 
> error (94): 'NotSupported''
> Couldn't load Operator Name: 'Current operator description is still unknown’
>

Totally unrelated errors I'd say.

-- 
Aleksander
https://aleksander.es
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