Help needed: How to pair bluetooth without SDP signal?

[Nightcookie]

Hey all,

I'm trying to pair a PPC with SonyEricsson's bluetooth watch MBW-150 to use moneytoo's brilliant SmartWatchM (http://forum.xda-developers.com/showthread.php?t=362218). This worked fine with my old PPC running the Microsoft bluetooth stack. My new PPC (LG KS20) uses the Widcomm/Broadcom stack, believed to be cleverer than the MS stack.

Here's the problem:
The PPC will not pair. The watch does not send out information according to the BT Service Discovery Protocol (SDP), because it was never meant to be paired with anything else than SE phones. The Microsoft stack didn't care and paired nonetheless. The Widcomm/Broadcom stack, however, will pair with BT devices only if it finds a supported profile. The watch uses the Serial Port Profile (SPP), but it doesn't say so, not sending any SDP information to the PPC. The PPC would support SPP of course, but doesn't pair as it has no way of knowing that the watch supports this profile.
In the end, when I try to pair, the PPC will see the watch but doesn't know what to do with it, and will not pair.

Is there any way of pairing (using a Widcomm/Broadcom stack) without SDP information? Can I enforce pairing with the watch? (I can easily insert serial port settings in the reg manually.)

Or can I somehow change my BT stack? I've read that the only way to do that would mean changing the ROM ... :-(

Any ideas? Any help would be greatly appreciated!

Many thanks,

N.

[moneytoo]

I'm using 32feet.NET library that supports only MS BT Stack. Fortunately I have just found this lib http://franson.com/bluetools/ that seems to support Widcomm Stack. I will try it soon. ;)

EDIT:
What BT stack is on it? Is it Broadcom? Widcomm on Motorola Q9 is ok and lets you to pair device without any service but Broadcom on a one HP iPAQ I have tested doesnt.

EDIT2:
Not a good news. Franson Bluetools doesnt work on smartphones. I dont know much about this stuff but from what I have read it seems like pairing/bonding request is possible only in MS BT stack (via some non official function) and it's disabled in other BT stacks because of security issues.

[Nightcookie]

Thanks for chiming in, moneytoo!

What BT stack is on it? Is it Broadcom? Widcomm on Motorola Q9 is ok and lets you to pair device without any service but Broadcom on a one HP iPAQ I have tested doesnt.

This may be a noob question but: How do I tell whether it's Broadcom or Widcomm? Is there still a difference since Broadcom bought Widcomm?
Anyway, BT manager will not pair ("no supported protocol found").

it seems like pairing/bonding request is possible only in MS BT stack (via some non official function) and it's disabled in other BT stacks because of security issues.

I'm afraid that's true. I haven't found anything so far that would point me to a workaround, backdoor or anything :( - and as my KS20 is a company phone I can hardly change the ROM :o

Let's hope someone comes up with an idea!