Re: [Bluez-users] Timeout for connections

["Mikael Lindqvist" <li.mikael.spam@gmail.com>]

Hi Marcel,

I ended up creating a little helper program that I run suid root that
sets the Page Timeout on startup of my application. I also use this
program to set the local name and try to force the inquiry mode to get
RSSI. I have a feeling that you won't like hearing about this at all
and you will probably take the opportunity to tell me I should use
D-BUS. Something which I'm thinking about more and more. The problem
with D-BUS is just that there is no Obex service available, and I
don't want half my application using D-BUS and the other half not. So
then I'm thinking more and more about writing a D-BUS Obex service.
But before I do that it would be nice to get some feedback on the
thoughts I have for that API. Where would be a good place to get that
feedback? This mailing list is certanly one place, but what more is
there?

-- Mikael

On 12/3/06, Marcel Holtmann <marcel@holtmann.org> wrote:
> Hi Mikael,
>
> > > > I would like to be able to set a timeout for service discoveries (and
> > > > eventually for rfcomm connections as well, but so far I've been
> > > > experimenting with service discoveries). For this I use non blocking
> > > > sockets by passing SDP_NON_BLOCKING to sdp_connect. Then I use select
> > > > with a timeout on the socket, and if it times out I call sdp_close.
> > > >
> > > > The problem is that after I have done this I can't use the bluetooth
> > > > chip for other connections for some time. Dumping the traffic with
> > > > hcidump, I saw that this is because even though the l2cap socket is
> > > > closed, the bluetooth chip is still doing the connection in the
> > > > background. For this connection to actually get canceled the chip
> > > > needs to be sent a HCI_Create_Connection_Cancel command, but it is not
> > > > sent when the socket is closed.
> > >
> > > use a 2.6.19 kernel and this command will be sent.
> > >
> >
> > Oh ok... Haven't had to build my own kernel before but I guess there
> > is a first time for everything... I'm using ubuntu and they say it
> > won't be available until next version in april... Problem is that
> > there are people who I can't tell "build the latest kernel" who relies
> > on the software I'm developing... what to do...
>
> there is a chance that Fedora Core will update their kernel to 2.6.19
> very soon. Otherwise you are out of luck.
>
> > Is there another way I can set a timeout for connections?
>
> No. Only the kernel can keep track of connections. If you try to do it
> by yourself in userspace you will break more than you fix. The reference
> count for the ACL link is tricky and only the kernel has all needed
> information to do it right.
>
> Regards
>
> Marcel
>
>
>
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