Telit LE910 failing to find network

[Kelvin]

Hi Aleksander,

I tried upgrading to modemmanager-1.6.4 and similar results. Comments below.


> The 3GPP module should by default auto-register in the best network it
> finds. When using a SIM card for a provider for which there is a real
> network available, that should happen instantly, not sure why it's not
> happening here.
>
> Can you try to to explicitly request the home connection with mmcli
> --3gpp-register-home?
>

"error: couldn't register the modem: 'Timeout was reached"'


> Also, can you try to register in a specific network with
> --3gpp-register-in-operator=[MCCMNC] ?
>

The same:
"error: couldn't register the modem: 'Timeout was reached"'


> > Is the "EPS supported: No" relevant? The LE910 supports 2G, 3G, 4G.
> >
>
> Since ModemManager 1.6.x we enable by default registration checks in
> the EPS (LTE) network, it was disabled by default in previous
> releases.
>

With 1.6.4 it still doesn't seem to check for EPS, though I'm not sure if
that matters:

Jul 17 22:26:16 linaro-gnome ModemManager[3108]: <debug> Running
registration checks (CS: 'yes', PS: 'yes', EPS: 'no')
Jul 17 22:26:16 linaro-gnome ModemManager[3108]: <debug> (ttyUSB3) device
open count is 2 (open)
Jul 17 22:26:16 linaro-gnome ModemManager[3108]: <debug> (ttyUSB3): -->
'AT+CREG?<CR>'
Jul 17 22:26:16 linaro-gnome ModemManager[3108]: <debug> (ttyUSB3): <--
'<CR><LF>+CREG: 2,2<CR><LF><CR><LF>OK<CR><LF>'
Jul 17 22:26:16 linaro-gnome ModemManager[3108]: <debug> (ttyUSB3) device
open count is 3 (open)
Jul 17 22:26:16 linaro-gnome ModemManager[3108]: <debug> (ttyUSB3) device
open count is 2 (close)
Jul 17 22:26:16 linaro-gnome ModemManager[3108]: <debug> (ttyUSB3): -->
'AT+CGREG?<CR>'
Jul 17 22:26:16 linaro-gnome ModemManager[3108]: <debug> (ttyUSB3): <--
'<CR><LF>+CGREG: 2,2<CR><LF><CR><LF>OK<CR><LF>'
Jul 17 22:26:16 linaro-gnome ModemManager[3108]: <debug> (ttyUSB3) device
open count is 1 (close)
Jul 17 22:26:16 linaro-gnome ModemManager[3108]: <debug> Modem not yet
registered in a 3GPP network... will recheck soon


> Oh, please update to MM 1.6.x and retry, please. MM 1.4.x is quite
> old, and MM 1.2.x is veeeeeery old. The MM 1.6.x release also comes
> with a Telit plugin, not available in earlier releases.
>

Still not having luck with 1.6.4, even though there are still 11 networks
showing in 3gpp-scan including the on I'm interested in.

>   | drivers: 'option1'
> >   | plugin: 'Generic'
> >   | primary port: 'ttyUSB8'
> >   | ports: 'ttyUSB8 (at)'
>
>

> Is this supposed to be a single-TTY modem?
>

Each Telit has 4x ttyUSB devices (I've got 2 connected to this board but
one is not in use, has no SIM card etc).

Thanks a lot for any hints, much appreciated.

Kelvin.
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