Re: [Bluez-devel] L2CAP_CONN_TIMEOUT without recompiling kernel?

Hi Mark,

I think the 40 secounds you are talking about is the timeout the kernel
waits if no status is returned from the actual bt-chip connected to you
host (via HCI)

I guess the timeout you are searching for is the page-time out. This
timer is managed on the chip an can be changed with "hciconfig hciX
pageto n" (if what your using is a usb device). man hciconfig also has a
lot of info.

Greetings

Andy

On Fri, 6 Aug 2004 17:32:27 +0100
Mark Thompson [off-list ref] wrote:

Hi,

	Is there any way to change (specifically - drastically shorten)
	the amount of time a call to connect() blocks for whilst
	attempting to connect to a remote device?

Hunting through the source, I've traced the delay back to 
${KERNELSRC}/net/bluetooth/l2cap.c, specifically L2CAP_CONN_TIMEOUT, 
which is defined as being 40 seconds in 
/usr/include/bluetooth/bluetooth.h.

Ideally I'd like a sockopt available to tune that parameter on a 
per-app basis.  The application we're developing seeks to determine
the presence of a 'bunch' of devices by trying to connect and then
sending an L2CAP echo request packet before waiting for a valid
response.

Moving to non-blocking connect() calls really isn't an option - the 
problem isn't detecting multiple devices, it's the amount of time it 
takes to ascertain whether a known device is present or not.

If I'm barking in the wrong forest, please feel free to boot me 
elsewhere :-)


I'm using gentoo 2004.0 with linux-2.6.3-gentoo-r1 on x86.

Thanks in advance,

--
Mark Thompson/



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