Re: [Bluez-devel] Master / Slave question

["Olivier Le Pogam" <olepogam@free.fr>]

Hi Peter,

> There is no real hard limit for the number of adapters you can use with
> BlueZ. Link key managment may become a little bit confusing (on the phone
> side) because the Link key is bound to the BT address of the adaptor. So
> if a phone connects to, say adaptor 1 the first time and then to adaptor 2
> the second time it must pair again 8if your application needs security at
> all).

That's ok as I don't need security to be enabled :)

> I think most phones should, in general, support Master/Slave switch.
> However, even when th Bluetooth implementation on the phone supports it,
> it is possible that a role switch request is rejected on the profile layer
> (depends on implementation).

Unfortunately, Nokia mobile phones (implementing the JSR 82) have a
problem with role switch, and definetely can't do it ... So if they
initiate the connection, they will remain master, and my linux bluetooth
key slave :) Trying to force to "master=true" in the btspp: URL or
putting lm=master in hcid.conf automatically raises a "role switch"
exception Nokia phone-side.

> For a server application like yours I would suggest to use the role
> switch feature in a more relaxed way. So, once a connection comes in try
> to do a role switch. If it succeed it is fine and you're able to accept an
> additional connection. If it fails you're out of resources but at least
> can service the current connection.
>
> However, if I understand it right you can not set this behaviour in
> hcid.conf. You have to implement it in your application.

What do you mean by implementing this in my application ? Is it
possible to manually deal with this in my server application ? Would you
have a location with examples ?

Thanks a lot, I feel more clever now, and at least understand why I
haven't succeeded !

Oli 



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