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From: Marcel Holtmann <marcel@holtmann.org>
To: BlueZ users <bluez-users@lists.sourceforge.net>
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Date: Fri, 28 Sep 2007 01:08:01 +0200
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Subject: Re: [Bluez-users] help with Logitech Travel Mouse
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Hi Martin,

> > > Thank you very much.  I didn't realize that hidd were supposed to still
> > > work.  I will look into writing a python tool that does what I want to
> > > do.  However, I still don't quite understand why the hidd behavior has
> > > changed and/or why it is incorrect to use them more then once.  In
> > > particular, in the case where a device (keyboard/mouse) was once paired
> > > with a computer, but then has been re-paired with another computer.  If
> > > I want to reconnect the keyboard/mouse to the first computer, wouldn't I
> > > have to re-issue a hidd --connect <MAC> ?  (or the equivalent D-Bus
> > > calls?)
> > 
> > the HID devices are not designed to work like this. Period. They only
> > support one binding with a host system. You try to make it work with a
> > scenario it is not designed for. If you need details, check the
> > Bluetooth HID specification.
> > 
> 
> I understand that HID devices only support one binding at a time.  But
> if I want to use the same keyboard with two systems, not at the same
> time but back and forth, then I should be able to re-authenticate it
> with the previous system.  This is a use case that totally makes sense
> and works fine.  It used to work fine between two Linux system, two
> Windows system and a Windows and Linux system.  I just had one keyboard
> and whenever I wanted to use it with another system, I'd reset the
> keyboard and re-pair it with the system at hand.  This is definitely
> possible and I am sure that the specifications allow for pairing with a
> system that was previously paired with in case the HID device lost its
> pairing.

the point here is to re-pair and for security reasons we reject attempts
from devices where the authentication fails. So it means you have to
actually remove the previous binding first before you can re-pair. From
a security point of view there is no other way to do that. All other
cases will make your system vulnerable for attacks.

Regards

Marcel



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