Re: [Bluez-devel] Slow connect time for devices

[Marcel Holtmann <marcel@holtmann.org>]

Hi Gareth,

> I'm working on a project on a Intel XScale processor, connecting to
> bluetooth heart rate monitors and headsets. Connections currently have
> 7 attempts to work, though leaving a debug flag on (which slows the
> handshake down) gets a near-instant connection. I would like to get
> the connections normal without slowing down the BT device after the
> connection is made.
> 
> Any normal connection, regardless of whether there's an authorization
> segment, will fail (errors 104 & 110 - 'Connection timed out' and
> 'Connection reset by peer') 7 times before connecting. It'll usually
> alternate between the two errors, and the 7 is fairly constant.
> 
> I have found that I can get the total connection time by reducing
> these two variables down to 2 seconds each. It still takes seven
> attempts. Once the first device is connected, any others will either
> be instant or have one timeout/reset.
> 
> (rfcomm.h)
> #define RFCOMM_CONN_TIMEOUT (HZ * 2)
> #define RFCOMM_DISC_TIMEOUT (HZ * 2)
> 
> I later found that enabling a debug flag will give me instant
> connections (how I assume things should be), because it is slowing
> down the process. The flag is HCI_CORE_DEBUG in bluetooth.h, which
> affects the fines hci_core.c, hci_conn.c and hci_event.c. I have
> isolated it to the hci_core.c file that needs to be slowed down.
> 
> I can't, however, leave the prints on or a loop to slow it down or
> sleep, as the SCO voice connection becomes unusable with them on once
> it is connected.
> 
> Can someone please suggest an approach to targeting and slowing down
> the handshake and the not the resulting connection?

this looks like a hardware limitation. What kind of dongles/chips are
you using?

Regards

Marcel




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