Re: [Bluez-devel] New HCI-USB device, no MAC?

[Marcel Holtmann <marcel@holtmann.org>]

Hi Nils,

> The issue was that some Bluetooth dongles do not contain a valid
> Bluetooth MAC address. Well, this is against the spec and so the dongles
> are bad but sometimes users cannot avoid to get such. So I still see the
> need that we do as good as we can to help those users and get those bad
> dongles working.
> 
> Long story short, Marcel's bdaddr application contained in the latest
> release of bluez-utils works, at least for the two dongles I have with
> ISS chipsets. So the BDADDR can be set now.
> 
> I wanted an automatic solution so that when I plug the dongle in it is
> automatically assigned "an" address. So first I created an udev rule
> that calls an application when the specific USB device with the
> vendorid:deviceid I know to be bad is inserted - in my case 1131:1001
> (plaease let me know more!).
> 
> Then I created a small shell script which sets a "more correct" address
> than the default 11:11:11:11:11:11. I assume in this script that an
> ethernet device is present in the system as eth0 and use its MAC for the
> Bluetooth dongle too.
> 
> I did this for two reasons:
> 1. On the same machine I always want to have the same BDADDR, so random
> was no choice.
> 2. The ethernet addresses also have to follow the same rules as
> Bluetooth MAC addresses, i.e. they have to be unique. So the probability
> of a collision is very low.

and now PAN will stop working, because the eth0 and bnep0 will have the
same MAC address. Not a good idea.

Regards

Marcel



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