Sony Bluetooth Control

Receiver mode makes the Sony device act as a Bluetooth speaker/source target. Transmitter mode sends audio out to Bluetooth headphones or speakers.

This checks power, turns the device on if needed, checks Bluetooth mode, switches to receiver mode if needed, then activates extInput:btAudio.

This is for connecting to a known Bluetooth address, not for discoverable pairing mode. Example format: AA:BB:CC:DD:EE:FF.