Puck.js iBeacon code not working

Can you try re-uploading again now please? It looks like a bug crept into the ibeacon code a while ago and nobody noticed - it should now be fixed.

Would it be possible to have the puck.js not advertise anything to save battery and enable it by clicking the button?

Yes, absolutely - just call NRF.sleep() and NRF.wake() - although that'll shut down Bluetooth LE if you're connected as well :)

To save power you could also look at just reducing the advertising interval if you wanted as well.