[Bluez-devel] problem with a speed

[Bluez-devel] problem with a speed

[zubiwat]

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I have a question what could be the cause of slow transfers through RFCOMM. I have rfcomm channel and I try to send a file but with a baud rate 115200 it is very slow comparing to those transfers through modem or sth like this with the same baud rate. 
Why it is like this. I tried to change MTU while configuration process but it didn't work.Where can I change this speed to make it faster? 

Regards 

Maciej

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Re: [Bluez-devel] problem with a speed

[Paulo Marques]

zubiwat wrote:

> I have a question what could be the cause of slow transfers through 
> RFCOMM. I have rfcomm channel and I try to send a file but with a baud 
> rate 115200 it is very slow comparing to those transfers through modem 
> or sth like this with the same baud rate.
> Why it is like this. I tried to change MTU while configuration process 
> but it didn't work.Where can I change this speed to make it faster?

What is on the other end: a linux box, or a mobile phone?

-- 
Paulo Marques - www.grupopie.com
"In a world without walls and fences who needs windows and gates?"



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Re: [Bluez-devel] problem with a speed

[Paulo Marques]

zubiwat wrote:

> These are two PC's - one with a Linux and RS232 dongle. The other one with a
> windows and USB dongle.


Here's your problem. An RS232 dongle only goes up to 115200 baud. Over this 
bandwidth it has to encapsulate all H4 protocol. Under that protocol it still 
uses xmodem or ymodem (or whatever you're using) to send the actual data, so in 
the end you probably will only get around 8 kbytes/s.

You will probably lose a lot of bandwidth in flow control too.


> When I'm trying to send a file it takes a while. It's very slow. What is
> responsible for the speed of connection in bluetooth. BT is capable of more
> than 115200 so what is wrong? Is the configuration of RFCOMM connection -
> "modems" ?


BT is capable of more than 115200 on the air. If you have a serial dongle, there 
is no way to push more bits than the serial port can handle.


> I can't figure out what is wrong.
> 


Use 2 USB dongles.

-- 
Paulo Marques - www.grupopie.com
"In a world without walls and fences who needs windows and gates?"



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