PocketMatrix

Hello,

i did a extensive research about the common bluetooth speed problems with the 3870 and the TDK USB BT Dongle. Many users report that they only get about transfer rates of 100-144kbit/s..

Today i worked with a friend who already has this kind of configuration (3870 + TDK USB Dongle) to find out why the speed is that low and how to make it faster.

We tried a couple of registry hacks to make BT faster..

1)

[HKEY_LOCAL_MACHINE\SOFTWARE\WIDCOMM\BtConfig\Seri
alTransport]
"BaudRate"=dword:00038400
"Device"="COM"
"Port"=dword:00000004
"ByteSize"=dword:00000008
"Parity"=dword:00000002
"StopBits"=dword:00000000

Here, "Baudrate" is set to 230400 bit/s , that is 2 times the maximum serial speed. So one might guess this is actually the speed that the ipaq's BT chipset is supposed to give - we tried changing it into something else - like 460800. No avail. Once we've changed the values and soft-resetted we encountered a bt stack error. Seems like it doesn't like when we change the values.

2)

[HKEY_CURRENT_USER\Comm\RasBook\`BlueToothActiveSy
nc]
"Entry"=hex:\
[...]

This is one of the default profiles you can set when configuring active sync - this is the only BT profile. The data there is very much and i can't figure out what it means - but i noticed that the serial profiles all have a speed set ( you can read it in the hex code) .. like that:

[HKEY_CURRENT_USER\Comm\RasBook\`115200 Standard]
"DevCfg"=hex:\
20,00,00,00,05,00,00,00,10,01,00,00,00,C2,01,00,00
,00,08,00,00,00,00,00,00,\
[..]

The 00 C2 01 is 115200.

So we tried to create a DevCfg Key under the BT profile and give it a higher speed. The BT Stack didn't crash but it didn't change a thing about the slow speeds.

==

I also did a search on brighthand about people who managed to sync with their PC via Bluetooth. I encountered
where a guy named AJones says that he can sync his IPAQ with his PC with USB like speeds. He uses a PCMCIA Card with his notebook from Toshiba if i'm not mistaken.

Is there a USB BT Dongle that supports HIGHER speeds than TDK's donge?

I would REALLY like to solve this speed problem!

Greetings
mac

THe first setting you chose to change, the baud rate. I'd try lowering that to 115200 or even 57600. It may try to send data at 2 MB/sec but then fling half the data back in an error, the device would then have to resend those packets. It might not make it faster, but it could make it more reliable at no cost to transfer rates.