Active Channel not getting updated with the change in band

[Senthilganapathy Paramasivam]

Hey Aleksander,
Thanks for the reply..
But using AT commands I was able to retrieve the info.. Thats what I
felt the issue might be in libqmi.

Regards
Senthil

On Fri, Sep 15, 2017 at 5:39 PM, Aleksander Morgado
<aleksander at aleksander.es> wrote:
> Hey,
>
>>
>> When running the --nas-get-rf-band-info command, the field "Active
>> Channel" does not seem to update with the change in band  (i.e) stuck
>> with the previous band or first attached band Channel value ).
>>
>> When CMW 500 - Base station simulator is set to band 3.
>>
>> # qmicli -d /dev/cdc-wdm1 --nas-get-rf-band-info
>>
>> [20 Jul 2017, 17:56:36] -Warning ** [/dev/cdc-wdm1] requested auto
>> mode but no MBIM QMUX support available
>> [/dev/cdc-wdm1] Successfully got RF band info
>> Radio Interface: 'lte'
>> Active Band Class: 'eutran-3'
>> Active Channel: '300'
>>
>> When CMW 500 - Base station simulator is set to band 5.
>>
>> # qmicli -d /dev/cdc-wdm1 --nas-get-rf-band-info
>>
>> [20 Jul 2017, 17:56:44] -Warning ** [/dev/cdc-wdm1] requested auto
>> mode but no MBIM QMUX support available
>> [/dev/cdc-wdm1] Successfully got RF band info
>> Radio Interface: 'lte'
>> Active Band Class: 'eutran-5'
>> Active Channel: '300'
>>
>> Following are the observation:
>>
>> 1. "Active Channel" is not getting updated in qmicli when the band is
>> changed on the go in call box ( ( base station simulator )
>>
>> 2. when the band is changed in call box ( base station simulator ) ,
>> if the celular modem is power cycled, the "Active Channel" is getting
>> updated in qmicli.
>>
>> 3. Or when the band is changed in call box ( base station simulator )
>> ,base station simulator is re-launched, the "Active Channel" is
>> getting updated in qmicli.
>>
>> 4. Able to read the channel no using AT!LTEINFO? , when the band is
>> changed on the go in call box ( ( base station simulator ).
>>
>> Is there a solution to this issue... Looks like a bug in libqmi ??
>>
>
> libqmi and qmicli are "dumb", they just talk to the modem and print
> the info it replies. If there is any issue with what "active channel"
> is being reported, that's an issue in the device firmware, there's
> nothing we can do in libqmi to fix that.
>
> --
> Aleksander
> https://aleksander.es