USB adaptors with the RTL8761B chipset are cheap and readily available
but so far support is missing in Openwrt. Enable the relevant kernel
options and add a module to the kmod-bluetooth package. Increases size
of kmod-bluetooth ipk from 279140 bytes to 285320 bytes on my ath79 build.
Tested on a WNDR3700v4 with rtl8761bu firmware.
Signed-off-by: Quintin Hill <stuff@quintin.me.uk>
bc67c27283