Re: [Bluez-devel] About concurrency sdp_connect

[Fabrizio Guglielmino <guglielmino@infitsrl.com>]

Hi Peter,
I'm not expert in bluez kernel driver programming but I've developed an =

application using socket abstraction
on Windows (microsoft stack) and I can connect simultaneously to many =

devices (7 max) with the same usb dongled
tested with bluez on linux. So I think it can't be a hardware problem, =

or better may be the hardware limitation but I think it's bypassable
in software layers.

bye
Fabrizio

Peter Wippich ha scritto:
> Hi Fabrizio,
>
> On Thu, 14 Sep 2006, Fabrizio Guglielmino wrote:
>
>   =

>> Are You sure it's hardware restriction?
>> sdp_connect internally use the socket abstaction to create a l2cap =

>> socket and make a
>> connection with standard connect.
>> In old threads there is a discussion about actual software limitation of =

>> l2cap layer to make simultaneous
>> connection so I think the problem in sdp_connect is the same..... =

>> bye
>>     =

>
> Well, maybe you did not went back far enough. The real problem is that =

> (all ?) Bluetooth hardware devices do not allow a second connect request =

> while another connect request is pending. I remember there was some =

> discussion to solve this in the l2cap layer by serializing connect =

> requests or reacting to the hardware responses proberly (retrying the =

> request when the hardware responds with command disallowed or similar to =

> the connect request). However, I don't know the current state . Get lost =

> somewhere .... =

>
> Ciao, =

> Peter  =

>
>
>
> |       Peter Wippich                   Voice: +49 30 46776411          |
> |       G&W Instruments GmbH            fax:   +49 30 46776419          |
> |       Gustav-Meyer-Allee 25, Geb. 12  Email: pewi@gw-instruments.de   |
> |       D-13355 Berlin  / Germany                                       |
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-- =

______________________________
Fabrizio Guglielmino =

Infit Srl
Software Engineering
Tel. +39 11 7410915
Fax. +39 11 7410915
www.infitsrl.com
C.so Svizzera, 79/8 - Torino
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