Re: [Bluez-devel] Transmitting and Receiving SCO data

[Hunyue Yau <hyau@mvista.com>]

On Monday 05 November 2007 11:43, robert wrote:
> Hi,
> 
> It is a USB dongle and it is on x86 (in vmware).  I tried with the  
> SCO patch (against 2.6.21) and noticed the same behavior.  I am using  
> a DBT-120 v4, which I read was a relatively reliable and well  
> supported device.  Receiving seems to work without any errors, it is  
> just transmitting that is failing.

Do you have a crash dump with the backtrace?

-- Hunyue
> 
> Does the bluez stack block if it is handed too much data?  Anything  
> else i should try?
> 
> Perhaps I will try using the headset profile, because that transmits  
> data, and will highlight whether it is a problem with my code.
> 
> nevertheless, being able to cause a crash like this from userspace is  
> somewhat worrisome.
> 
> --robert
> 
> On Nov 5, 2007, at 11:29 AM, Hunyue Yau wrote:
> 
> > On Saturday 03 November 2007 09:03, robert wrote:
> >> Hello,
> >>
> >> I am trying to write a program that just sends and receives SCO data,
> >> and I am running into some problems during the transmit phase.
> >> Whenever I try to stream out SCO data, the bluetooth dongle is
> >> disconnected from the system, which sometimes just closes the
> >> connection, but other times it crashes the whole machine.  (the
> >> program doing the transmitting inevitably crashes).
> >
> > Hi,
> >
> > This sounds a lot like a problem I debugged recently. Is the bluetooth
> > dongle on USB? Also what platform (x86 or ???)? What brand and
> > chipset (if known) is the dongle?
> >
> > No one has replied or commented on my post but if you look in the
> > archives, I have a set of patches that works around/fixes it for  
> > me. It
> > would be good to confirm I am not the only seeing this problem.
> >
> > -- Hunyue
> >>
> >> Is there something special that is required for sending SCO data?  I
> >> have looked at all of the test programs and none of them seem to do
> >> anything odd.  I am limiting the writes to the MTU size on the
> >> connection, but I am writing multiple times in a row.  (another test
> >> program seems to do this)
> >>
> >> the code is a little convoluted but I can post a link to it if anyone
> >> is interested.
> >>
> >> cheers,
> >> robert
> >>
> >>
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