[Bluez-devel] Port parameter negotiation?

[Bluez-devel] Port parameter negotiation?

[Till Harbaum]

Hi list,

does BlueZ implement rfcomm port paramater negotiation? This is required to 
allow a bluetooth->rs232 converter so set the baud rate etc according to the 
settings on the hosts virtual serial port. E.g. changing the baudrate on a 
windows bluetooth com port changes the rs232 bit rate on the bt device as 
well (ok, at least my widcomm/win98 notebook does this only for 57600 and 
115200 correctly).

So using something like 
  stty -F /dev/rfcomm0 speed 9600 

should IMHO cause a rfcomm port negotiation packet to be sent on client side. 
But i don't see this happen ...

Am i doing something wrong? I am using rfcomm 1.3 on a 2.6.8 kernel.

Till

-- 
Dr.-Ing. Till Harbaum                       Tel.:  +49 721 4998963
BeeCon GmbH                                 Fax:   +49 721 4998962
Haid-und-Neu Strasse 7, 76131 Karlsruhe     Mobil: +49 179 9087904
harbaum@beecon.de                           http://www.beecon.de


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Re: [Bluez-devel] Port parameter negotiation?

[Marcel Holtmann]

Hi Till,

> does BlueZ implement rfcomm port paramater negotiation? This is required to 
> allow a bluetooth->rs232 converter so set the baud rate etc according to the 
> settings on the hosts virtual serial port. E.g. changing the baudrate on a 
> windows bluetooth com port changes the rs232 bit rate on the bt device as 
> well (ok, at least my widcomm/win98 notebook does this only for 57600 and 
> 115200 correctly).
> 
> So using something like 
>   stty -F /dev/rfcomm0 speed 9600 
> 
> should IMHO cause a rfcomm port negotiation packet to be sent on client side. 
> But i don't see this happen ...

as far as I remember we haven't fully implemented it. We only have code
to fulfill the Bluetooth qualification requirements. However the main
RFCOMM interface are sockets and there you don't have to worry about the
baud rate. Adding support for it should not be that hard. Find out what
IOCTL the command above triggers and prepare the correct negotiation
packet.

Regards

Marcel




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Re: [Bluez-devel] Port parameter negotiation?

[Till Harbaum]

Hi Marcel,

On Monday 29 November 2004 12:34, Marcel Holtmann wrote:
> to fulfill the Bluetooth qualification requirements. However the main
> RFCOMM interface are sockets and there you don't have to worry about the
> baud rate. Adding support for it should not be that hard. Find out what
> IOCTL the command above triggers and prepare the correct negotiation
> packet.
Ok, another job for a student in need of a linux/bluez thesis :-)

Till

-- 
Dr.-Ing. Till Harbaum                       Tel.:  +49 721 4998963
BeeCon GmbH                                 Fax:   +49 721 4998962
Haid-und-Neu Strasse 7, 76131 Karlsruhe     Mobil: +49 179 9087904
harbaum@beecon.de                           http://www.beecon.de


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