Earlier this year, I took a chance on buying one of these poorly documented Chinese BOLUTEK RS232 / Bluetooth modules. I followed these instructions, and to my surprise, it worked great for a basic wireless serial terminal between my G4 (with USB Bluetooth adapter) and Mac SE. Hopefully, I can use it to establish a wireless PPP link to my Macintosh 128k. First, I need to re-solder my broken RS422 to RS232 adapter, though. Wireless internet, here I come!
Oh, and the Fanny Mac arrived already. It fits and works great!