[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [bluetooth-dev] Line collision between SDP and RF_COMM



On Wed, 30 Jan 2002 15:35:50 +0100 Matthias Fuchs 
<matthias.fuchs@xxxxxxx.com> wrote:

Hi, Matthias:

> > Hi, Matthias:
> >   Do you mean, device A can setup two rf_comm connections with B using 
> >   different 'line'?
> 
> You can do that. OpenBT does not complain about that. But the second RFCOMM channel does not work !
> 
> > 
> > I am not sure what happens if SDP is also connected at the same time.
> 
> Same with me !
> 
> Did anybody else check out if two RFCOMM channels between the same two devices can be setup at the
> same time ?
> 
I had set up two connections (one for rf_comm, one for SDP) with 
 different 'line' numbers between the same two devices and they 
 worked.
For rf_comm, I think it sould work as well.

Ran

> Matthias
> 
> 
> > 
> >>Should we allow such scenarios ?
> >>
> >>Matthias
> >>
> >>Ran Zhou wrote:
> >>
> >>
> >>>Hi,
> >>>OpenBT(I am currently using OpenBT-20010816) uses 'line' for sdp 
> >>>connection object and rf_comm connection object, this may cause 
> >>>trouble for application.For example:
> >>>1. If device A opened connection to device B, A would get line0 for
> >>>   the connection. Then if B opened a rf_comm connection to A, the 
> >>>   stack in A would assign line0 to the rf_comm connection unawaring
> >>>   that the line had already assigned to sdp connection. The application
> >>>   in A would have no way to use ioctl command 'BTISLOWERCONNECTED' to 
> >>>   detect the rf_comm connection and can't open /dev/ttyBT0.
> >>>2. There is possibility (I guess OpenBT doesn't want this happens)
> >>>   that the A can have more than one 'line'  connecting to B(eg. one 
> >>>   for rf_comm, one for sdp). This will cause problem too if you use
> >>>   'BTREADREMOTEBDADDR'.
> >>>These are just my experience, someone may correct me if I am wrong.
> >>>
> >>>Regards
> >>>
> >>>Ran 
> >>>
> >>>----------------------
> >>>Ran Zhou
> >>>Centre for Communications Research
> >>>University of Bristol
> >>>c/o: PACT
> >>>University Gate                            Tel:  +44 117 915 1278
> >>>Park Row                                   Fax:  +44 117 954 5206
> >>>Bristol BS1 5UB                          
> >>>United Kingdom                             Email: Ran.Zhou@xxxxxxx.uk
> >>>
> >>>-
> >>>To unsubscribe from this list: send the line "unsubscribe bluetooth-dev" in
> >>>the body of a message to majordomo@xxxxxxx.com
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >>-- 
> >>-------------------------------------------------------------------------
> >>
> >>                             _/_/_/_/   Matthias Fuchs
> >>                            _/_/_/_/   Dipl.-Ing.
> >>                           _/_/_/_/   matthias.fuchs@xxxxxxx.com
> >>
> >>       _/_/_/   _/_/_/_/_/_/_/      esd electronic system design gmbh
> >>     _/   _/  _/             _/    Vahrenwalder Str. 207
> >>    _/   _/    _/_/_/   _/   _/   D-30165 Hannover
> >>    _/             _/  _/   _/   Phone: +49-511-37298-0
> >>     _/_/_/_/_/_/_/   _/_/_/    Fax:   +49-511-37298-68
> >>
> >>-------------------------------------------------------------------------
> >>
> >>-
> >>To unsubscribe from this list: send the line "unsubscribe bluetooth-dev" in
> >>the body of a message to majordomo@xxxxxxx.com
> >>
> > 
> > ----------------------
> > Ran Zhou
> > Centre for Communications Research
> > University of Bristol
> > c/o: PACT
> > University Gate                            Tel:  +44 117 915 1278
> > Park Row                                   Fax:  +44 117 954 5206
> > Bristol BS1 5UB                          
> > United Kingdom                             Email: Ran.Zhou@xxxxxxx.uk
> > 
> > 
> > 
> > 
> 
> 
> -- 
> -------------------------------------------------------------------------
> 
>                              _/_/_/_/   Matthias Fuchs
>                             _/_/_/_/   Dipl.-Ing.
>                            _/_/_/_/   matthias.fuchs@xxxxxxx.com
> 
>        _/_/_/   _/_/_/_/_/_/_/      esd electronic system design gmbh
>      _/   _/  _/             _/    Vahrenwalder Str. 207
>     _/   _/    _/_/_/   _/   _/   D-30165 Hannover
>     _/             _/  _/   _/   Phone: +49-511-37298-0
>      _/_/_/_/_/_/_/   _/_/_/    Fax:   +49-511-37298-68
> 
> -------------------------------------------------------------------------
> 

----------------------
Ran Zhou
Centre for Communications Research
University of Bristol
c/o: PACT
University Gate                            Tel:  +44 117 915 1278
Park Row                                   Fax:  +44 117 954 5206
Bristol BS1 5UB                          
United Kingdom                             Email: Ran.Zhou@xxxxxxx.uk

-
To unsubscribe from this list: send the line "unsubscribe bluetooth-dev" in
the body of a message to majordomo@xxxxxxx.com