Re: [Bluez-users] Key exchange before pairing

[Marcel Holtmann <marcel@holtmann.org>]

Hi Jordi,

> I would like to know if it is possible to perform a "peer key
> exchange" prior to the pairing operation, in order to for example,
> have the peers exchange some extra information about them and be able
> for example to look-up different PINs for every different service /
> connection / device.
>=20
> I have written a little program using rfcomm sockets (although I am
> planing to change them to BNEP ones) which carries out the data
> exchange without problems as long as the security manager is set to
> 'none'.
>=20
> But I would like to be able to replace the normal pairing procedure
> with this "key exchange between bluetooth peers" procedure:=20
>=20
> * it is then possible to trigger (maybe via 'pin_helper' ?) a data
> exchange between the two bluetooth sockets (using raw L2CAP sockets,
> for example) while the devices are _not paired_ and while the security
> level is set at least to authentication ?
>=20
> * I tried to change the rfcomm "working" sockets program to L2CAP
> sockets, but then I don=B4t know which  Protocol Service MUX (psm) valu=
e
> I might have to set for this sockets to have them connect successfully
> (the one from an already existing service, one of the reserved
> values?!).=20
>=20
> I tried different odd values greater than 1 for the psm (using
> htobs(psm)) and I get the following error message:=20
>=20
> Cannot connect to socket: Connection refused (111)
>=20
> I would really appreciate it if you could help me out or give me some
> advise on these topics.

actually I have no idea what you are trying to achieve. Try to include
examples, because I can't follow you.

Regards

Marcel




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