How to configure a 723kbps connection?

Bluez-users Marcel Holtmann 2 participants 2 messages Feb 17, 2004 – Sep 26, 2018 1 message not in the archive Bluetooth drivers

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2018-09-26 19:24 UTC #1 lore raw

Quoted 5 lines · Steven Singer

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.

Quoted 4 lines

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.

Quoted 4 lines

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

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Marcel Holtmann

author maintainer

2004-02-17 18:58 UTC #2 lore raw

Hi Matt,

Quoted 6 lines

Quoted 4 lines
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?

No. You need a protocol analyser for this.

Regards

Marcel