network manager doesn't find cdc-wdm0

[Kevin Kettinger <kkettinger gmail com>]

Hello,

i'm trying to create a network manager configuration for my cdc-wdm0 
device. Connection to the internet with qmi-network works, but network 
manager doesn't seem to find the device after creating the connection 
profile.

Versions:
----------------------------------------------------------------
nmcli tool, version 1.16.0
mmcli 1.8.2
----------------------------------------------------------------

mmcli -m 0
----------------------------------------------------------------
/org/freedesktop/ModemManager1/Modem/0 (device id 
'378d72221e014b745b2f5c9fbb2abc6a5fc78b4e')
  -------------------------
  Hardware |   manufacturer: 'Telit'
           |          model: 'LE910C1-EU'
           |       revision: 'M0F.220006'
           |   H/W revision: 'unknown'
           |      supported: 'gsm-umts, lte'
           |        current: 'gsm-umts, lte'
           |   equipment id: '355001092002764'
  -------------------------
  System   |         device: 
'/sys/devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb1/1-1/1-1.1'
           |        drivers: 'qmi_wwan, option1'
           |         plugin: 'Telit'
           |   primary port: 'ttyUSB2'
           |          ports: 'ttyUSB0 (unknown), ttyUSB1 (unknown), 
ttyUSB2 (at), ttyUSB3 (at), ttyUSB4 (unknown), wwan0 (net)'
  -------------------------
  Numbers  |           own : 'unknown'
  -------------------------
  Status   |           lock: 'none'
           | unlock retries: 'sim-pin (3), sim-pin2 (3), sim-puk (10), 
sim-puk2 (10)'
           |          state: 'disabled'
           |    power state: 'on'
           |    access tech: 'unknown'
           | signal quality: '0' (cached)
  -------------------------
  Modes    |      supported: 'allowed: 2g; preferred: none
           |                  allowed: 3g; preferred: none
           |                  allowed: 2g, 3g; preferred: none
           |                  allowed: 4g; preferred: none
           |                  allowed: 2g, 4g; preferred: none
           |                  allowed: 3g, 4g; preferred: none
           |                  allowed: 2g, 3g, 4g; preferred: none'
           |        current: 'allowed: 2g, 3g, 4g; preferred: none'
  -------------------------
  Bands    |      supported: 'unknown'
           |        current: 'unknown'
  -------------------------
  IP       |      supported: 'ipv4, ipv6, ipv4v6'
  -------------------------
  3GPP     |           imei: '355001092002764'
           |  enabled locks: 'none'
           |    operator id: 'unknown'
           |  operator name: 'unknown'
           |   subscription: 'unknown'
           |   registration: 'unknown'
           |    EPS UE mode: 'csps-1'
  -------------------------
  SIM      |           path: '/org/freedesktop/ModemManager1/SIM/0'

  -------------------------
  Bearers  |          paths: 'none'
----------------------------------------------------------------

I then try to create the nm configuration like this:
----------------------------------------------------------------
nmcli c add type gsm ifname ttyUSB2 con-name emnify apn em
----------------------------------------------------------------

I tried ttyUSB2, cdc-wdm0, wwan0, but after starting the connection the 
output is always the same:

nmcli con up emnify
----------------------------------------------------------------
Error: Connection activation failed: No suitable device found for this 
connection (device lo not available because device is strictly unmanaged).
----------------------------------------------------------------

nmcli d
----------------------------------------------------------------
DEVICE  TYPE      STATE      CONNECTION
eth0    ethernet  connected  Wired connection 1
can0    can       unmanaged  --
can1    can       unmanaged  --
lo      loopback  unmanaged  --
wwan0   wwan      unmanaged  --
----------------------------------------------------------------

I appreciate any help, thank you.

Mit freundlichen Grüßen / Best regards,
Kevin Kettinger