Requirements for u-blox LARA0-R2 (R280)

[Brendan Simon (eTRIX)]

I'm trying to get a u-blox LARA-R280 device working with my embedded
linux build -- using Linux kernel 4.4.0 (armhf) and Debian Buster (testing).

  * ModemManagerv 1.10.0
  * NetworkManager 1.14.6


ModemManager discovers the device ok, but NetworkManger does not see a
network device (e.g. `cdc-wdm0` which is what I get with a Quectel modem).

# mmcli -L
    /org/freedesktop/ModemManager1/Modem/0 [u-blox] LARA-R280

# mmcli -m 0
  --------------------------------
  General  |            dbus path: /org/freedesktop/ModemManager1/Modem/0
           |            device id: cefae5a09feceda70ab244f864cd3239d518b487
  --------------------------------
  Hardware |         manufacturer: u-blox
           |                model: LARA-R280
           |             revision: 30.43
           |            supported: gsm-umts, lte
           |              current: gsm-umts, lte
           |         equipment id: 357364080026759
  --------------------------------
  System   |               device:
/sys/devices/soc0/amba/e0002000.usb/ci_hdrc.0/usb1/1-1
           |              drivers: cdc_acm
           |               plugin: u-blox
           |         primary port: ttyACM0
           |                ports: ttyACM3 (unknown), ttyACM4 (unknown),
ttyACM5 (unknown),
           |                       ttyACM0 (at), ttyACM1 (at), ttyACM2 (at)
  --------------------------------
  Status   |       unlock retries: sim-pin (3), sim-pin2 (3), sim-puk
(10), sim-puk2 (10)
           |                state: registered
           |          power state: on
           |          access tech: lte
           |       signal quality: 60% (recent)
  --------------------------------

# nmcli d
DEVICE   TYPE      STATE         CONNECTION        
eth0     ethernet  connected     wired-connection-1
ttyACM0  gsm       disconnected  --                
sit0     iptunnel  unmanaged     --                
tunl0    iptunnel  unmanaged     --                
lo       loopback  unmanaged     --        


`nmcli` shows a `ttyACM0` serial device (instead of the network
interface device).  I'm expecting something like `cdc-wdm0`.  Is that a
correct assumption?

I hand to Monkey patch my kernel to work with the Quectel device
(following documents from Quetel), but I can't find any information from
u-blox about kernel driver requirements (other than the device works
with standard linux drivers).

Any ideas what drivers I need configured/enabled/patched to get the
LARA-R2 module to enumerate as a network device?

Thanks,
Brendan.

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