We're going to synthesize some audio and want to transmit over Bluetooth 
from our embedded device to a Bluetooth headset. Also need to do SPP 
output. We can provide audio output over I2S or just serial.

BC127 module can do this but is obsolete. Many modules can only act as 
slave for audio, and I'm defeated by vendor websites with lots of pretty 
photos and singing and dancing, but no clarity on what their products 
can do...

Anybody able to recommend a module that can do this (with external 
antenna) ???

Thanks!