Can my puck interrupt on both BTN and TILT?

The two things will work fine together - Puck.js has a bunch of different interrupt sources and chooses them such that they don't conflict.

However probably what you're hitting is that setAdvertising isn't additive - so when you call the button one you'll end up removing the 0x1821 service that the tilt listener added?

Easiest thing to do is to create one function called updateAdvertising that sets everything, and then call that whenever something changes.

Also just FYI, but swapBlue/etc can be replaced with LED3.toggle() if you want to swap the LED state