Re: [Bluez-devel] btsco - a few comments and a small .py script

[John Gruenenfelder <johng@as.arizona.edu>]

On Fri, Aug 19, 2005 at 09:38:55PM +0200, Andreas Beck wrote:
>Q: I have used the same bluetooth dongle on different machines or with
>different machine configurations (e.g. using windows). Now my device
>will refuse to pair again with the dongle.
>
>A: Remove the line in /var/lib/bluetooth/[my-bdaddr]/linkkeys that is
>corresponding to the device that doesn't want to pair. BlueZ thinks it
>is already paired, but the Link-Key does not match.
>
>   I've seen a rather recent question that seems to be the same problem
>   on bluez-users. However the hints there point to
>   /etc/bluetooth/linkkeys - is this outdated or is this due to me using
>   debian packages?

This was my experience.  My device simply stopped working after I had used it
on another machine (same dongle though).  I am also using the Debian packages
and there is no /etc/bluetooth/linkkeys.

For me, the problem manifested itself as "input/output error" messages when
trying most bluetooth commands or btsco.  That's not a lot of help.

Eventually, somebody in my local users group tipped me off to the location of
the link keys as /var/lib/bluetooth and after deleting the offending files, my
headset could be paired again and it works now.

This seems, to me, to be a bug on both ends.

Bug 1) When you list the files in the Debian bluez packages,
/var/lib/bluetooth is not listed.  This is a clear packaging bug as that
directory should definitely be listed therein, even if the package doesn't
actually ship with any files *in* that directory (they are program
generated).

Bug 2) When the bluez tools (hcitool I think) are told to remove a key, they
do not do so.  That also made tracking down my problem harder.  Thinking it
was a key issue, the command to delete the key was given, but it didn't seem
to do anything.  Only manually deleting the file off the filesystem did the
trick.


-- 
--John Gruenenfelder    Research Assistant, Steward Observatory, U of Arizona
                        johng@as.arizona.edu
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