MC7750 libqmi

[Dan Williams]

On Mon, 2013-11-04 at 14:37 -0800, Tim Harvey wrote:
> Hi Dan - thanks for the response!
> 
> On Mon, Nov 4, 2013 at 12:55 PM, Dan Williams <dcbw at redhat.com> wrote:
> > On Mon, 2013-11-04 at 11:19 -0800, Tim Harvey wrote:
> >> Heath,
> >>
> >> I saw your thread here
> >> http://lists.freedesktop.org/archives/libqmi-devel/2012-November/000386.html
> >> on the libqmi maillist archives and was wondering what the status is?
> >>
> >> I have a MC7750 that I've established a connection with using libqmi
> >> v1.6 but it seems after some time traffic stops being passed and
> >> 'qmi-network /dev/cdc-wdm0 status' shows disconnected. If I do a
> >> 'qmi-network /dev/cdc-wdm0 start' traffic resumes again.  It sounds
> >> like this is a different issue than you encountered?  I have the same
> >> results if I hack qmicli to add QMI_DEVICE_OPEN_FLAGS_NET_802_3 and
> >> QMI_DEVICE_OPEN_FLAGS_NET_NO_QOS_HEADER it seems to behave the same.
> >> Its possible that I don't have an adequate signal strength as I'm not
> >> clear yet how to determine with libqmi what radio band I'm connected
> >> with and what an appropriate signal level is.
> >
> > I've got a 7750 that works fine here; how long is "after some time"?
> > I've used mine for at least a couple hours at a time, though only
> > stationary.  The LTE signal is almost always good (better than -70dbm)
> > which might be why it works so well :)
> 
> I always seem to drop the connection within 20 minutes.  At that point
> sometimes I can do a 'qmi-network /dev/cdc-wdm0 start' to restart it,
> other times that results in a 'error: cannot re-start network, PDH
> already exists' and I have to do a qmi-network stop first.
> 
> >
> > First, what firmware version?
> >
> > qmicli -d /dev/cdc-wdm0 --dms-get-revision
> 
> Revision: 'SWI9600M_01.00.09.03AP R2492 CARMD-EN-10526 2011/07/01 19:31:09'
> 
> I questioned if this was indeed the cmd to get the firmware revision
> as the above looks very old.  I believe the latest is 3.5.10.9 Sept 11
> 2013.  I'll have to dig into the docs to figure out how to update it
> (I believe I have to use a windows host and app)

Mine has 3.x, so yeah, you probably really, really do want that
version :)

Dan

> >
> > To determine signal strength and other information, you want:
> >
> > qmicli -d /dev/cdc-wdm0 --nas-get-signal-strength
> > qmicli -d /dev/cdc-wdm0 --nas-get-serving-system
> > qmicli -d /dev/cdc-wdm0 --nas-get-signal-info
> >
> 
> root at OpenWrt:/# qmicli -d /dev/cdc-wdm0 -V
> 
> qmicli 1.6.0
> Copyright (2012) Aleksander Morgado
> License GPLv2+: GNU GPL version 2 or later
> <http://gnu.org/licenses/gpl-2.0.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.
> 
> root at OpenWrt:/# qmicli -d /dev/cdc-wdm0 --nas-get-signal-strength
> [/dev/cdc-wdm0] Successfully got signal strength
> Current:
> Network 'cdma-1x': '-96 dBm'
> Other:
> Network 'cdma-1xevdo': '-63 dBm'
> RSSI:
> Network 'cdma-1x': '-96 dBm'
> Network 'cdma-1xevdo': '-63 dBm'
> ECIO:
> Network 'cdma-1x': '-7.0 dBm'
> Network 'cdma-1xevdo': '9.0 dBm'
> IO: '-52 dBm'
> SINR: (8) '9.0 dB'
> root at OpenWrt:/# qmicli -d /dev/cdc-wdm0 --nas-get-serving-system
> [/dev/cdc-wdm0] Successfully got serving system:
> Registration state: 'registered'
> CS: 'attached'
> PS: 'attached'
> Selected network: '3gpp2'
> Radio interfaces: '2'
> [0]: 'cdma-1xevdo'
> [1]: 'cdma-1x'
> Roaming status: '(null)'
> Data service capabilities: '2'
> [0]: 'cdma'
> [1]: 'evdo-rev-a'
> CDMA System ID:
> SID: '40'
> NID: '4'
> CDMA Base station info:
> Base station ID: '5008'
> Latitude: '0.000000'*
> Longitude: '0.000000'*
> Roaming indicators: '2'
> [0]: '(null)' (cdma-1x)
> [1]: '(null)' ((null))
> Default roaming status: '(null)'
> 3GPP2 time zone:
> Leap seconds: '16' seconds
> Local time offset: '-480' minutes
> Daylight saving time: 'no'
> CDMA P_Rev: '6'
> root at OpenWrt:/# qmicli -d /dev/cdc-wdm0 --nas-get-signal-info
> error: couldn't get signal info: QMI protocol error (71): 'InvalidQmiCommand'
> 
> I believe I recall --nas-get-signal-info working in the past - perhaps
> this was changed between libqmi v1.0 and what I'm on now (v1.6)?
> 
> Thanks,
> 
> Tim
> 
> > Most likely you don't care what radio band you're using, you just care
> > what access technology (cdma, evdo, umts, lte) you're using and what the
> > signal strength is.
> >
> > Dan
> >
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