I haven’t done this, so it’s just theoretical.
If the Bluetooth device uses the equivalent of keyboard arrow keys to go forwards or backwards, then it should just be a matter of detecting which key is pressed.
So, on key press, check the event to see which key was pressed. You need to know the key codes to know which key was pressed. I discuss this in my book, but it’s also discussed here…
So, the Bluetooth device could theoretically control a Hype project, similar to a PowerPoint / Keynote presentation.