troubleshooting a Quectel EC25-E modem

[Sebastian Sjoholm]

On Mon, May 28, 2018 at 2:15 AM, Alberto Bursi <bobafetthotmail at gmail.com>
wrote:

> Hi, I'm having some issues in getting a EC25-E minipcie modem (Quectel) to
> work on my PC (and also on my OpenWrt router).
>
> I'm using a minipcie-to-usb adapter that has also a SIM slot to connect it
> to them.
>
> 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
>
> and AT commands I try to send to ttyUSB1 (the only "free" serial port)
> just hang and never give me any answer.
>
>
I can't say much regarding the qmi/uqmi errors, but the ttyUSB1 should be
the GPS port, so there you wouldn't get any response on AT commands. You
need to use ttyUSB2 or ttyUSB3, and if these are busy, could there be some
other process accessing them? (the ttyUSB0 is the DIAG port)

And when using mPCIe-to-usb adapter, make sure the modem get enough power,
a single USB 2.0 with 500mA is usually not enough, and Y-USB cable would be
recommended.

-Sebastian
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