Sierra wireless modem network selection preference

[Dan Williams]

On Thu, 2018-05-03 at 12:45 +0200, Erik Kazandjian wrote:
> Hi I.m trying to add this feature. I started by changing the
> nas.json 
> defintion. For there on I get some code generated. I also added in
> the 
> qmicli_nas.c and extra command. But I'm stucked now because first of
> all 
> I'm not sure which call I have to do to actually set this option in
> the 
> modem and secondly I don't see where in the generated a call to the 
> driver is done to execute the function I want.
> Could you guide me a little to say where I have to add the
> modifications ?

Most of the code and JSON is already there for the manual/auto bits
except the parts that parse the qmicli input and add the TLV.

What I was thinking of here was to change the format of set-system-
selection-preference to be something like:

--nas-set-system-selection-preference=[cdma-1x|cdma-
1xevdo|gsm|umts|lte|td-scdma][,[auto|manual=MCCMNC]]

eg, you could:

--nas-set-system-selection-preference=lte,manual=310260
--nas-set-system-selection-preference=auto
--nas-set-system-selection-
preference=gsm|umts,auto

or something like that.

We'd need to change set_system_selection_preference_input_create() to
parse that new format, instead of just calling
qmicli_read_rat_mode_pref_from_string().  Something like the attached
rough patch, perhaps?  Any chance you could test that out and clean it
up?

Thanks!
Dan

> Thanks
> 
> Erik
> 
> 
> On 04/30/2018 08:36 PM, Dan Williams wrote:
> > On Fri, 2018-04-27 at 16:27 +0200, Erik Kazandjian wrote:
> > > Hi,
> > > 
> > > I have 2 identical Sierra Wireless modems. If I call sudo qmicli
> > > -d
> > > /dev/cdc-wdm0 --nas-get-system-selection-preference on the first
> > > modem I get
> > > 
> > > 
> > >       Emergency mode: 'no'
> > >       Mode preference: 'umts, lte'
> > >       Band preference: 'wcdma-2100, wcdma-850-us, wcdma-800,
> > > wcdma-
> > > 900,
> > > wcdma-1700-japan'
> > >       LTE band preference: '1, 3, 5, 7, 8, 18, 19, 21, 38, 39,
> > > 40, 41'
> > >       TD-SCDMA band preference: 'f'
> > >       Roaming preference: 'any'
> > >       Network selection preference: '*automatic*'
> > >       Service domain preference: 'cs-ps'
> > >       Service selection preference: 'automatic'
> > > 
> > > 
> > > on the second I get
> > > 
> > >       Emergency mode: 'no'
> > >       Mode preference: 'umts, lte'
> > >       Band preference: 'wcdma-2100, wcdma-850-us, wcdma-800,
> > > wcdma-
> > > 900,
> > > wcdma-1700-japan'
> > >       LTE band preference: '1, 3, 5, 7, 8, 18, 19, 21, 38, 39,
> > > 40, 41'
> > >       TD-SCDMA band preference: 'f'
> > >       Roaming preference: 'any'
> > >       Network selection preference: '*manual*'
> > >       Service domain preference: 'cs-ps'
> > >       Service selection preference: 'automatic'
> > > 
> > > 
> > > Is there a way to change the Network selection preference
> > 
> > With libqmi yes, but we don't currently have the auto/manual
> > exposed
> > through qmicli unfortunately.  I took a quick look and it's not a
> > 10
> > minute task unfortunately due to the existing --nas-set-system-
> > selection-preference syntax.
> > 
> > If you're just looking to switch this modem to 'auto' and be done
> > though, that wouldn't be too hard with a one-off patch.
> > 
> > Dan
> 
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