Re: [Bluez-users] How to configure a 723kbps connection?

grpmind+bluez.users
2004-02-17T10:50:20Z

Steven Singer wrote:

> Marcel, I don't think this is what Matt meant. I think he was asking
> that given that the link quality and power levels are good and given
> that he can't get more that 265 kbps regardless of packet type, is it
> likely that he's being limited by some component of the system other
> than the Bluetooth link - such as the UART baud rate on the Ipaq.

Steve's right. What I meant by "all this" was everything I had written,
not just the part about rssi, lq, and tpl.

> Is there an easy way to find out what baud rate the Ipaq is using?
> That would answer the question straight away. 265 kbps over the air
> is equivalent to roughly 350 kbps over the UART (assuming one start bit,
> one stop bit, no parity and large HCI packets).

Not presently, because it is running Pocket PC 2003. (If there is a way to
tell with PPC, let me know.) Hopefully soon Linux will be running well
on it and then maybe I could tell you; it is booting but not everything
works yet. Maybe http://michaelo.free.fr/pda/h2210/starterkit/bootlog
would give you an idea.

This is an ipaq 2215, which has Intel's PXA255 processor, which according
to the docs has a 920Kbps interface. But I suppose that doesn't mean HP
hooked it up optimally.

> Also, although you're right that the RSSI has nothing to do with the
> chosen packet type, the link quality has a big effect. As the link
> quality falls, devices will tend to switch automatically from DH
> packets to the more robust DM packets.

Could I use hcidump to tell what's going on?

Matt