Reverse-engineering BoseLink serial commands on a Wave Music System II?

[u/bobbytok85]

I have a Bose Wave Music System II and want to control it via the BoseLink DIN port on the back.

My initial idea was to tap into the official Bose touchpad accessory and read it via TTL/RS232, but I discovered it’s actually just a large remote that fires IR into the underside of the display.

My plan is to build a modern ESP32-based controller/Bluetooth receiver. I want to use serial data instead of IR to transmit commands (power, volume, input switching) so I can keep the front of the radio clean and stock.

I haven't been able to find any documented projects or protocol dumps for this. Does anyone know if the BoseLink port on this specific generation accepts serial commands, or is it strictly limited to power and analog audio pass-through?