Telit LE910 failing to find network

[Kelvin]

Hi,

I'm working with a Telit LE910 modem for which ModemManager is constantly
looping unable to find a network:
Jul 17 08:05:45 linaro-gnome ModemManager[10429]: <debug> Running
registration checks (CS: 'yes', PS: 'yes', EPS: 'no')
Jul 17 08:05:45 linaro-gnome ModemManager[10429]: <debug> (ttyUSB8) device
open count is 2 (open)
Jul 17 08:05:45 linaro-gnome ModemManager[10429]: <debug> (ttyUSB8): -->
'AT+CREG?<CR>'
Jul 17 08:05:45 linaro-gnome ModemManager[10429]: <debug> (ttyUSB8): <--
'<CR><LF>+CREG: 2,2<CR><LF><CR><LF>OK<CR><LF>'
Jul 17 08:05:45 linaro-gnome ModemManager[10429]: <debug> (ttyUSB8) device
open count is 3 (open)
Jul 17 08:05:45 linaro-gnome ModemManager[10429]: <debug> (ttyUSB8) device
open count is 2 (close)
Jul 17 08:05:45 linaro-gnome ModemManager[10429]: <debug> (ttyUSB8): -->
'AT+CGREG?<CR>'
Jul 17 08:05:45 linaro-gnome ModemManager[10429]: <debug> (ttyUSB8): <--
'<CR><LF>+CGREG: 2,2<CR><LF><CR><LF>OK<CR><LF>'
Jul 17 08:05:45 linaro-gnome ModemManager[10429]: <debug> (ttyUSB8) device
open count is 1 (close)
Jul 17 08:05:45 linaro-gnome ModemManager[10429]: <debug> Modem not yet
registered in a 3GPP network... will recheck soon


Scanning for networks there are plenty available, and I have tried SIM
cards for both EE and O2:

sudo mmcli -m 1 --3gpp-scan --timeout=300

Found 11 networks:
23410 - O2 - UK (gsm, available)
23415 - vodafone UK (umts, available)
23415 - vodafone UK (lte, available)
23410 - O2 - UK (lte, available)
23415 - vodafone UK (gsm, available)
23430 - EE (gsm, available)
23410 - O2 - UK (umts, available)
23420 - 3 UK (umts, available)
23430 - EE (umts, available)
23420 - 3 UK (lte, available)
23430 - EE (lte, available)

Is the "EPS supported: No" relevant? The LE910 supports 2G, 3G, 4G.

This is running on an embedded ARM device with a fairly old Ubuntu -
ModemManager was on 1.2.0. I've tried upgrading to 1.4.0 and the behaviour
is the same.

A bit more mmcli info below. Any hints would be much appreciated.

Many thanks,
Kelvin.


/org/freedesktop/ModemManager1/Modem/1 (device id
'09c17ce0710e6316d160278ddd03f542021ac6ad')
  -------------------------
  Hardware | manufacturer: 'Telit'
  | model: 'LE910-EUG'
  | revision: '17.00.523'
  | supported: 'gsm-umts, lte'
  | current: 'gsm-umts, lte'
  | equipment id: '359852053548609'
  -------------------------
  System | device:
'/sys/devices/f9400000.ssusb/f9400000.dwc3/xhci-hcd.0.auto/usb1/1-2/1-2.1'
  | drivers: 'option1'
  | plugin: 'Generic'
  | primary port: 'ttyUSB8'
  | ports: 'ttyUSB8 (at)'
  -------------------------
  Numbers | own : 'unknown'
  -------------------------
  Status | lock: 'none'
  | unlock retries: 'unknown'
  | state: 'searching'
  | power state: 'on'
  | access tech: 'unknown'
  | signal quality: '0' (cached)
  -------------------------
  Modes | supported: '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: '359852053548609'
  | enabled locks: 'none'
  | operator id: 'unknown'
  | operator name: 'unknown'
  | subscription: 'unknown'
  | registration: 'searching'
  -------------------------
  SIM | path: '/org/freedesktop/ModemManager1/SIM/0'

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