troubleshooting a Quectel EC25-E modem

[Alberto Bursi]

On 28/05/2018 09:29, Aleksander Morgado wrote:
>> When I connect it to my PC (running OpenSUSE Tumbleweed, qmicli is version
>> 1.20.0 here) I get a normal output in dmesg
>>
>> |[50477.827418] usb 2-1.5.2: new high-speed USB device number 12 using
>> ehci-pci [50477.945515] usb 2-1.5.2: New USB device found, idVendor=2c7c,
>> idProduct=0125 [50477.945523] usb 2-1.5.2: New USB device strings: Mfr=1,
>> Product=2, SerialNumber=0 [50477.945527] usb 2-1.5.2: Product: Android
>> [50477.945531] usb 2-1.5.2: Manufacturer: Android [50477.946831] option
>> 2-1.5.2:1.0: GSM modem (1-port) converter detected [50477.947098] usb
>> 2-1.5.2: GSM modem (1-port) converter now attached to ttyUSB0 [50477.947479]
>> option 2-1.5.2:1.1: GSM modem (1-port) converter detected [50477.947815] usb
>> 2-1.5.2: GSM modem (1-port) converter now attached to ttyUSB1 [50477.948227]
>> option 2-1.5.2:1.2: GSM modem (1-port) converter detected [50477.948652] usb
>> 2-1.5.2: GSM modem (1-port) converter now attached to ttyUSB2 [50477.949066]
>> option 2-1.5.2:1.3: GSM modem (1-port) converter detected [50477.949479] usb
>> 2-1.5.2: GSM modem (1-port) converter now attached to ttyUSB3 [50477.950365]
>> qmi_wwan 2-1.5.2:1.4: cdc-wdm0: USB WDM device [50477.953115] qmi_wwan
>> 2-1.5.2:1.4 wwan0: register 'qmi_wwan' at usb-0000:00:1d.0-1.5.2, WWAN/QMI
>> device, 16:9f:df:80:d5:ca [50478.769176] qmi_wwan 2-1.5.2:1.4
>> wwp0s29u1u5u2i4: renamed from wwan0|
>>
>> But it seems I can't communicate with it at all from the PC, any command
>> from qmicli fails with the same error
>>
>> qmicli -d /dev/cdc-wdm0 --nas-get-system-info
>> [28 mag 2018, 01:21:55] -Warning ** Error reading from istream: Resource
>> temporarily unavailable
>>
> Is ModemManager running in the system already? You can check that
> listing modems with "mmcli -L".
> If you want to make sure your qmicli commands don't collide with
> whatever MM is doing, append a "-p" to all your qmicli commands, so
> that they all go through the qmi-proxy (MM also uses qmi-proxy by
> default).
>

Thanks for the help!

Yes I had ModemManager running, appending -p didn't work,
but removing ModemManager freed up the qmi interface and now qmcli 
commands work.

Now that I confirmed that the modem works correctly I'll have to figure 
out what's wrong with
the uqmi utility in OpenWrt. Fun and games.

-Alberto