[Connman] Configure cellular network
 

Greetings !

I'm having a little issue with my Jolla.

The device used for cellular connection exists (I can see it using `ip link show`), but connman doesn't see it anymore.
I can get the 3G connection back by reseting the device. And it'll disappear again the first time connman restarts (ie: `systemctl restart connman.service` is enough to reproduce this for me).

With the connman test package, I was able to see that a service
'cellular_01234thatsalonghash' exists right after reseting the Jolla.
It disappears right after connman restarts, leaving me with nothing more than wlan and bluetooth services.

I'd like to know what are the configuration files that I should be looking into to fix this.
And if I was to configure a cellular connection from scratch, where would I start ?

Thanks for your help !