Subject: Re: [Bluez-devel] decoding RFCOMM on hcidump -X -V
From: Marcel Holtmann <marcel@holtmann.org>
To: bluez-devel@lists.sourceforge.net
In-Reply-To: <5f30e2610602261444m477c13b6m3667c3031e5cb298@mail.gmail.com>
References: <5f30e2610602261444m477c13b6m3667c3031e5cb298@mail.gmail.com>
Content-Type: text/plain
Message-Id: <1140997944.23559.15.camel@localhost>
Mime-Version: 1.0
Sender: bluez-devel-admin@lists.sourceforge.net
Errors-To: bluez-devel-admin@lists.sourceforge.net
Reply-To: bluez-devel@lists.sourceforge.net
Date: Mon, 27 Feb 2006 00:52:24 +0100

Hi Jeff,

> Does Bluetooth's RFCOMM protocol have ACKs and a sliding window, like
> TCP?  Is it possible for a sending application to block on send when
> sending a large payload to a slow reading application?

the RFCOMM is using flow control only. There is no sliding window and
thus no real ACK mechanism.

> I'm trying to debug a program I wrote using
> socket(PF_BLUETOOTH,SOCK_STREAM,BTPROTO_RFCOMM). Where can I learn
> more about decoding the output of `hcidump -X -V` especially as it
> applies to traffic crossing this RFCOMM socket?  I am particularly
> interested in what to look for when chasing flow control and TCP-like
> reliability.

Since RFCOMM also has an MTU, you will see the packets going over the
air and the granted credits from each side.

Regards

Marcel


-------------------------------------------------------
This SF.Net email is sponsored by xPML, a groundbreaking scripting language
that extends applications into web and mobile media. Attend the live webcast
and join the prime developer group breaking into this new coding territory!
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642
_______________________________________________
Bluez-devel mailing list
Bluez-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bluez-devel