[Gta04-owner] Using a GTA04 of as wifi hot-spot.

NeilBrown neilb at suse.de
Thu Jan 3 02:49:38 CET 2013

On Thu, 03 Jan 2013 01:01:55 +0000 Neil Jerram <neil at ossau.homelinux.net>

> NeilBrown <neilb at suse.de> writes:
> >  - AT_OWANCALL=1,1,1
> >    should result in asynchronous notification of call status. (The last '1'
> >    means async notify).  However that notification only ever appears on 
> >    /dev/ttyHS_Control, much like the 'NO CARRIER' when the remote end hangs
> >    up only appears on /dev/ttyHS_Modem.
> >    As I didn't want to use HS_Control in my main modem monitoring app (I
> >    leave that free to send SMS messages) I just used polling with AT_OWANCALL?
> >    to get the status.
> What are the status changes that can be notified for a data call?  I
> imagined that a data call should stay up forever or until explicitly
> torn down, but perhaps that's wrong?
> (In practice I have noticed times when my data connection went down
> without me asking it - as indicated in QtMoko by the "3" or "G" in the
> title bar being hollow instead of filled in.)

just returns "OK", not useful status.  It just starts the call-setup
The status is reported asynchronously or by polling with AT_OWANCALL?

 The status can be 

     0 = Disconnected
     1 = Connected
     2 = In setup
     3 = Call setup failed.

So normally soon after the "AT_OWANCALL=1,1,1" you get
if it worked an
if it didn't.

If you poll during this time you get

If then   
to shut down the connection, you get
shortly afterwards.

I don't know if you can get other notifications.  Possibly if you lose signal
you get 
Possibly the network can shut the call for whatever reason in which case you
would again get "_OWANCALL=1,0", and you could respond by setting it up again.

In general, I think the data connection does stay up indefinitely.  But
things can go wrong and the protocol needs to be able to deal with that.


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