Bluetooth status, compatible USB Bluetooth adapters?

[David Young <dyoung%pobox.com@localhost>]

I bought a couple of thumbnail-sized USB Bluetooth 5.0 adapters.
Today I plugged one into a Rock64 board.  I see ubt0 and bthub0
attach---great! `btconfig ubt0 inquiry` does not reveal my Apple
keyboard.

Apparently the adapter I tried today (a TP-Link UB500) does work with
Linux, however, a Realtek firmware blob has to be loaded.

By the way, to interoperate with Bluetooth Low Energy devices, is
anything beyond a compatible USB Bluetooth adapter needed?  For example,
kernel or utility changes?

David

-- 
David Young
dyoung%pobox.com@localhost    Urbana, IL    (217) 721-9981