From: Paulo Marques <pmarques@grupopie.com>
To: zubiwat <zubiwat@poczta.onet.pl>
Cc: bluez-devel@lists.sourceforge.net
Subject: Re: [Bluez-devel] problem with a speed
Date: Tue, 27 Apr 2004 11:35:32 +0100 [thread overview]
Message-ID: <408E3774.4000108@grupopie.com> (raw)
In-Reply-To: 008d01c42bd5$cbeea6a0$fcca010a@firedrake
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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prev parent reply other threads:[~2004-04-27 10:35 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-04-26 19:19 [Bluez-devel] problem with a speed zubiwat
2004-04-26 19:24 ` Paulo Marques
[not found] ` <008d01c42bd5$cbeea6a0$fcca010a@firedrake>
2004-04-27 10:35 ` Paulo Marques [this message]
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