From: mindentropy <mindentropy@gmail.com>
To: Brian Gix <bgix@codeaurora.org>
Cc: linux-bluetooth@vger.kernel.org
Subject: Re: Re: Regarding setting baud rate for RFCOMM.
Date: Fri, 09 Dec 2011 02:39:59 +0530 [thread overview]
Message-ID: <15405272.3etRtz984e@terranet> (raw)
In-Reply-To: <4EE1213F.1090303@codeaurora.org>
On Thursday 08 Dec 2011 12:42:39 PM Brian Gix wrote:
> Hi mindentropy,
>
> On 12/8/2011 12:12 PM, mindentropy wrote:
> > How can I set the baud rate and other tty settings for RFCOMM for
> > data
> >
> > sending? The receiving application is a windows application which reads
> > at 115200 baud rate via virtual comm port.
>
> Baud rate does not really apply to RFCOMM in bluetooth. Baud rate refers
> to how fast the level shifters on a piece of UART hardware (perhaps
> RS232) transition between one bit to the next, while RFCOMM simply grabs
> data (in the case of bluez, through a pipe or socket) and sends it over
> the BT link at whatever rate the underlying ACL connection currently
> supports, which constantly is changing to based on environmental conditions.
>
> The RFCOMM transport in BT is intended to be a simplified way to migrate
> an existing UART based application to bluetooth.
>
> But in fact, if you were to create a UART abstraction on top of RFCOMM
> which did accept baud rate as a parameter, it would not matter if you
> set the BAUD to 300, 115200, or 921600 -- The data would flow at a rate
> that you would not be able to directly control. Other than that, it
> would generally mimic "classic" RS-232. In other words, you shouldn't
> need to do anything to your Windows App, as long as it is currently able
> to send and receive data via the virtual comm port.
I am slightly confused. I am sending the data in linux according to
http://people.csail.mit.edu/albert/bluez-intro/x502.html
In the windows side I open up hyperterminal and connect on the virtual comm
port @ 115200 baud rate. I don't get any data though. What am I doing wrong?
prev parent reply other threads:[~2011-12-08 21:09 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-08 20:12 Regarding setting baud rate for RFCOMM mindentropy
2011-12-08 20:42 ` Brian Gix
2011-12-08 21:09 ` mindentropy [this message]
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