USB to Bluetooth adaptor

Has anyone had a go/success at using USB to Bluetooth adaptors with RISC OS?

I’ve had a go. I had some success with early experiments, but, when I started to turn it into something that worked, I consistently found that the dongle was thrown off the USB. That was regardless of which dongle (I have 3 different ones) and two significantly different lots of code.

It was sufficiently disheartening that I haven’t tried again.

Are there any good books about/on this?

Anyone tried:-

“Practical Applications in Digital Signal Processing” Richard Newbold

PDF vers Hardback?