On 29/04/2016 17:44, Denis Kenzior wrote:

This card is mainly QMI but also have Diag, NMEA and AT interfaces
(ttyUSB). I think that's why he did it in setup_sierra.

What is the AT interface capable of?  Can this modem be driven using AT commands instead?  Would certainly be easier to debug.

All main commands are available ( ETSI) but I don't think PPP can be used.
Additionnaly, it's a 4G modem, using PPP layer instead QMI will reduce performances, isn't it ?

Do you mean I can use an "hybrid" mode using modem management through AT and network through QMI ?

Your modem doesn't seem to want to read anything from the SIM.  So
that is why your gprs isn't showing up.

Do you have a SIM in there or a PIN set?

OK, so I understand that Data feature is detected by scanning SIM
capabilities + chip capabilities (UMTS, LTE, ...)
Am I right ?

Sort of.  oFono is a full telephony stack, so we expect the basics to be provided.  IMSI availability tells us that the SIM has been initialized to the point that it is useable.  E.g. PIN has been unlocked/entered.

OK, I see.

My SIM doesn't have PIN and I can use Standard QMI tools (libqmi) to
bring up a connection.
I will so investigate around SIM QMI requests / replies.

Are sim operations supported / working on this modem with libqmi?
Please find few tests below

$ qmicli -d /dev/cdc-wdm0 --dms-uim-get-imsi   
[/dev/cdc-wdm0] UIM IMSI retrieved:
        IMSI: '208103790757141'

$ qmicli -d /dev/cdc-wdm0 --dms-uim-get-state
[/dev/cdc-wdm0] UIM state retrieved:
        State: 'initialization-completed'

$ qmicli -d /dev/cdc-wdm0 --dms-uim-get-pin-status
[/dev/cdc-wdm0] PIN status retrieved successfully
[/dev/cdc-wdm0] PIN1:
        Status: disabled
        Verify: 3
        Unblock: 10
[/dev/cdc-wdm0] PIN2:
        Status: enabled-not-verified
        Verify: 2
        Unblock: 10