Take it one step at a time. I’ve had a fun time just intercepting the Bluetooth communication part for little devices.

Most of the time the protocols are not locked down, and if it’s a popular device chances are someone else already did it for you.

You can get help by decompiling the Android app for the device which should give more info about the content of the Bluetooth messages.

That’s the level I’m at right now. Oscilloscopes and all that look intimidating to me too!