Telit 4G Modem - qmi command errors

[Daniele Palmas]

Hi Nigel,

2017-06-29 10:31 GMT+02:00 Nigel Jones <Nigel.Jones at ast-uk.com>:
> Hello,
>
> I am using a Telit LE910-EUG 4G Modem on a custom Linux OS ( Buildroot and
> 4.9.13 Kernel ). I was having a few issues and noticed that Buildroot did
> not include the latest ( 1.18.0 ) version of libqmi so I upgraded that.
>
> Things seem much better after that, but now I am getting intermitant errors
> when trying to use the "qmicli" and "qmi-network" commands.
>
> These are the two typical errors I am seeing:
>
> 1)
> # qmicli -d /dev/cdc-wdm0 --nas-get-signal-strength
> [28 Jun 2017, 13:44:37] -Warning ** Error reading from istream: Error
> reading from file descriptor: Input/output error

please check if the following commit

https://github.com/torvalds/linux/commit/19445816996d1a89682c37685fe95959631d9f32

makes any improvement.

Regards,
Daniele

> error: couldn't create client for the 'nas' service: CID allocation failed
> in the CTL client: Transaction timed out
> # qmicli -d /dev/cdc-wdm0 --nas-get-signal-strength
> error: couldn't create client for the 'nas' service: QMI protocol error (3):
> 'Internal'
> # qmicli -d /dev/cdc-wdm0 --nas-get-signal-strength
> error: couldn't create client for the 'nas' service: QMI protocol error (3):
> 'Internal'
>
> 2)
> # qmi-network /dev/cdc-wdm0 status
> Loading profile at /etc/qmi-network.conf...
>     APN: internet
>     APN user: web
>     APN password: web
>     qmi-proxy: no
> Getting status with 'qmicli -d /dev/cdc-wdm0 --wds-get-packet-service-status
> '...
> error: couldn't create client for the 'wds' service: CID allocation failed
> in the CTL client: Service mismatch (requested 'wds', got 'nas')
> error: couldn't get packet service status
>
> I can *generally* communicate OK when trying to get signal strength using
> "qmicli -d /dev/cdc-wdm0 --nas-get-signal-strength" and I can connect
> serially to one fo the ttyUSB devices and run "AT" commands without issue.
>
> Has anyone come across these errors, or can give me any tips what could be
> wrong or how to help diagnose the issue further?
>
> Thanks in advance.
> Nigel.
>
>
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