Cinterion PLS8-X, udhcp fails

[Aleksander Morgado]

Hey

On Wed, Mar 16, 2016 at 12:57 PM, José <Joseddg92 at gmail.com> wrote:
> I am trying to use a Cinterion PLS8-X with ModemManager. The modem is
> properly identified and enabled, and the connection is properly
> established. But when I try to use the network interfaces and get an
> IP from the DHCP server, it fails to get any IP address.
>
> This is the log:
>
> root at ccimx6sbc:~# ModemManager &
> root at ccimx6sbc:~# ModemManager[827]: <info>  ModemManager (version
> 1.4.12) starting in system bus...
> ModemManager[827]: <info>  Creating modem with plugin 'Cinterion' and '7' ports
> ModemManager[827]: <warn>  Could not grab port (tty/ttyACM4): 'Cannot
> add port 'tty/ttyACM4', unhandled serial type'
> ModemManager[827]: <warn>  Could not grab port (tty/ttyACM3): 'Cannot
> add port 'tty/ttyACM3', unhandled serial type'
> ModemManager[827]: <warn>  Could not grab port (tty/ttyACM2): 'Cannot
> add port 'tty/ttyACM2', unhandled serial type'
> ModemManager[827]: <info>  Modem for device at
> '/sys/devices/soc0/soc.0/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb1/1-1/1-1.1'
> successfully created
> ModemManager[827]: <info>  Modem: state changed (unknown -> disabled)
>
> root at ccimx6sbc:~#
> root at ccimx6sbc:~#
> root at ccimx6sbc:~# mmcli -m 0 --simple-connect=movistar.es
> Error parsing connect string: 'Couldn't find equal sign separator'
> root at ccimx6sbc:~# mmcli -m 0 --simple-connect=apn=movistar.es
> ModemManager[827]: <info>  Simple connect started...
> ModemManager[827]: <info>  Simple connect state (3/8): Enable
> ModemManager[827]: <info>  Modem
> /org/freedesktop/ModemManager1/Modem/0: state changed (disabled ->
> enabling)
> ModemManager[827]: <info>  Modem
> /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state
> changed (unknown -> registering)
> ModemManager[827]: <info>  Modem
> /org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state
> changed (registering -> home)
> ModemManager[827]: <info>  Modem
> /org/freedesktop/ModemManager1/Modem/0: state changed (enabling ->
> registered)
> ModemManager[827]: <info>  Simple connect state (4/8): Wait to get fully enabled
> ModemManager[827]: <info>  Simple connect state (5/8): Register
> ModemManager[827]: <info>  Simple connect state (6/8): Bearer
> ModemManager[827]: <info>  Simple connect state (7/8): Connect
> ModemManager[827]: <info>  Modem
> /org/freedesktop/ModemManager1/Modem/0: state changed (registered ->
> connecting)
> ModemManager[827]: <info>  Modem
> /org/freedesktop/ModemManager1/Modem/0: state changed (connecting ->
> connected)
> ModemManager[827]: <info>  Simple connect state (8/8): All done
> successfully connected the modem
> root at ccimx6sbc:~# mmcli -m 0
>
> /org/freedesktop/ModemManager1/Modem/0 (device id
> 'f19bc7567e36f9fef0e5998b5f6a9f7346785ec1')
>   -------------------------
>   Hardware |   manufacturer: 'Cinterion'
>            |          model: 'PLS8-X'
>            |       revision: 'REVISION 03.003'
>            |      supported: 'gsm-umts, lte'
>            |        current: 'gsm-umts, lte'
>            |   equipment id: '004401081420651'
>   -------------------------
>   System   |         device:
> '/sys/devices/soc0/soc.0/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb1/1-1/1-1.1'
>            |        drivers: 'cdc_acm, cdc_ether'
>            |         plugin: 'Cinterion'
>            |   primary port: 'ttyACM1'
>            |          ports: 'ttyACM1 (at), ttyACM0 (at), usb0 (net),
> usb1 (net)'
>   -------------------------
>   Numbers  |           own : 'unknown'
>   -------------------------
>   Status   |           lock: 'none'
>            | unlock retries: 'sim-pin (3), sim-pin2 (3), sim-puk (10),
> sim-puk2 (10), ph-net-pin (10), ph-net-puk (32), ph-fsim-pin (10),
> ph-fsim-puk (32)'
>            |          state: 'connected'
>            |    power state: 'on'
>            |    access tech: 'edge'
>            | signal quality: '20' (recent)
>   -------------------------
>   Modes    |      supported: 'allowed: 2g; preferred: none
>            |                  allowed: 3g; preferred: none
>            |                  allowed: 2g, 3g; preferred: none
>            |                  allowed: 2g, 3g, 4g; preferred: none'
>            |        current: 'allowed: any; preferred: none'
>   -------------------------
>   Bands    |      supported: 'egsm, dcs, pcs, g850, u1900, u850'
>            |        current: 'egsm, dcs, pcs, g850, u1900, u850'
>   -------------------------
>   IP       |      supported: 'ipv4, ipv6, ipv4v6'
>   -------------------------
>   3GPP     |           imei: '004401081420651'
>            |  enabled locks: 'none'
>            |    operator id: '21407'
>            |  operator name: 'Movistar'
>            |   subscription: 'unknown'
>            |   registration: 'home'
>   -------------------------
>   SIM      |           path: '/org/freedesktop/ModemManager1/SIM/0'
>
>   -------------------------
>   Bearers  |          paths: '/org/freedesktop/ModemManager1/Bearer/0'
>

I bet if you run "mmcli -b 0" to show the bearer details, it will tell
you that "PPP" should be used.

> root at ccimx6sbc:~# mmcli -
> root at ccimx6sbc:~# udhcpc -i usb0
> udhcpc (v1.23.2) started
> cdc_ether 1-1.1:1.10 usb0: CDC: unexpected notification 01!
> Sending discover...
> Sending discover...
> ^C
> root at ccimx6sbc:~# udhcpc -i usb1
> udhcpc (v1.23.2) started
> cdc_ether 1-1.1:1.12 usb1: CDC: unexpected notification 01!
> Sending discover...
>
> Any idea why the CDC ether driver warns about that unexpected
> notifications, and why is the dhcp client not working?

The Cinterion plugin supports either:
  * AT+PPP
  * QMI

The plugin doesn't currently support AT+USBX; i.e. it doesn't know how
to start the connection in a way that the USBX interface can be used.
Do you have the AT command reference for that device?

-- 
Aleksander
https://aleksander.es