Subject: Re: [Bluez-devel] pan link quality
From: Marcel Holtmann <marcel@holtmann.org>
To: bluez-devel@lists.sourceforge.net
In-Reply-To: <43C29249.3020008@fillibach.de>
References: <43C29249.3020008@fillibach.de>
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Date: Tue, 10 Jan 2006 17:07:36 +0100

Hi Kosta,

> I am currently playing around in setting up IP ad-hoc networks using
> bluez. olsr-over-bluetooth works, and `pand -Q` is a nice thing :)
> 
> The bad stuff is that inquiry & connecting can take some time, but its 
> hard to really do something against that. (I have a few hacks in mind, 
> but they wont scale)
> 
> What would be really nice is some link quality metric. On my mobile 
> device `hcitool lq` always returns 255 (Even if the link goes bad and 
> the other side sees it). But I have one metric in mind: the interface 
> gets destroyed if a certain number of packets are not acknowledged by 
> the receiver. Is there some way (other than writing a script that 
> listens to hcidump) to measure this? `ifconfig bnep0` shows errors:0
> and dropped:0 until it is detroyed. I am not a kernel hacker, i looked 
> around a bit in the bluez module, the library and pand, but couldnt 
> really find anything...
> 
> Do you have any hints? Is there any "unacknoledged packets" metric 
> accessible from userland? Where is the code that destroys the bnep 
> interface after x packets?

the link quality is vendor specific and we really only know how CSR
implemented it. The RSSI might be another indicator, but I assume some
chip manufacturers did a bad implementation. What chips are you using?

> PS: Are you interesed in a "zeroconf ip" patch for pand?

Go ahead and post the patch to the mailing list. We will review it.

Regards

Marcel


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