just wondering if there is any chance to peek at GR236 bluetooth debug messages log? I am asking this because I have no success connecting my Sony Ericsson W150(aka "Yendo") cell phone to GPS receiver via BT, I always get "Connection failed" error message on the phone, although I was able to add GR236 to a device list on my phone with no problems at all. I use SirfDemo for monitoring GR236's messages, but couldn't find any realtime BT stack messages whilst trying to connect it with my W150...
My GR-236 unit has software ver. "SW Version GSW3.2.4 3.1.00.12-SDK003P1.00a"; S/N: 236-718.....
Those Bluetooth modules are very versatile. Disassemble the receiver, identify the module and find a decent documentation. Most likely defaults are the transparent mode and any diagnostics turned off (ideal for a dumb cable replacement while everything works). Then, after a bit of soldering and interfacing with the computer, and perhaps even after some programming, you might acquire some equivalent of these messages.
Can't offer any real reverse-engineering facts because mine still works (don't fix it if it ain't broke) and no problems so far with a couple of smartphones and a few computers.