[Bluez-devel] bandwidth when using serial cable

[Bluez-devel] bandwidth when using serial cable

[Kutschenreuter Matthias]

Hi all, 

I work with several Bluetooth Chips, but they have
one commonality: they all have to be connected via serial
cable. Am I right, that attaching with
	hciattach /dev/ttyS0 any 115200 
limits the data rate to 115,2 Kbit/s, which is the
speed of serial cable? I am not talking about any 'baseband'
datarate or l2ping, I am talking about the user data rate, 
lets say for transfering a 10 MBit file.
Did anyone get higher throughput than this 115, 
when using serial cables? 

Regards, Matthias



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Re: [Bluez-devel] bandwidth when using serial cable

[Marcel Holtmann]

Hi Matthias,

> I work with several Bluetooth Chips, but they have
> one commonality: they all have to be connected via serial
> cable. Am I right, that attaching with
> 	hciattach /dev/ttyS0 any 115200 
> limits the data rate to 115,2 Kbit/s, which is the
> speed of serial cable? I am not talking about any 'baseband'
> datarate or l2ping, I am talking about the user data rate, 
> lets say for transfering a 10 MBit file.

I can't remeber that he was using a serial connection, but in case of a
limited serial connection to the Bluetooth module, the data rate of the
BNEP transmission is also limited.

> Did anyone get higher throughput than this 115, 
> when using serial cables? 

You can use many chips with higher baud rates. Look at the source code
of hciattach what kind of special setting we support.

Regards

Marcel




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