Subject: Re: [Bluez-users] Bitstuffing in a Rfcomm connection?
From: Agustin Jose Fusaro <afusaro@apexar.com>
To: bluez-users@lists.sourceforge.net
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Date: Thu, 23 Feb 2006 12:58:14 -0300

Hi Marcel,

Here's the situation. I have an open rfcomm connection which I use
through a file descriptor, fd: fd = open(devname, O_RDWR | O_NOCTTY);

I realized that the 'extra bytes' I was reading (using the read
function) actually are some bytes that I'm periodically writing (using
the write function) to this file descriptor. It's like I have an 'echo'
of the bytes I write... I read all the incoming that AND the bytes I'm
writing  to this fd.

I'm taking a closer look at the documentation for these functions right
now...

Thanks a lot!!!
Agustin Fusaro - Apexar Technologies

On Wed, 2006-02-22 at 22:27 +0100, Marcel Holtmann wrote:
> Hi Agustin,
> 
> > I'm writing an application that communicates using rfcomm connections.
> > This application communicates with mobile devices. In order to debug the
> > application I also wrote a mobile device emulator that runs in a
> > computer.
> > 
> > Here's the problem:
> > When the application connects to the mobile device everything works
> > fine. But when the application connects to the computer emulating a
> > device, I obtain, mingled with the data the following bytes:
> > "00 5E 40". Sometimes these bytes are together. Some other times these
> > bytes are spreaded among the real data bytes. These additional bytes
> > keeps the application from synchronizing with the emulated device.
> > 
> > My question is: when an rfcomm connection is stablished between two
> > computers, is there some bit/byte stuffing involved?
> 
> provide is with a full "hcidump -X -V" for this problem, because I have
> no idea what you are talking about.
> 
> Regards
> 
> Marcel
> 
> 
> 
> 
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