I'm building an alarm system that arms/disarms itself based on the physical proximity of certain people. I have found the easiest way to do that (while integrating other parts of the system) is by utilizing a bluetooth device that broadcast its address. I could just make the people leave their phones in broadcast mode, but that forces some security risks.
So the question: are there any small chips or devices (no larger than a standard key) that constantly broadcast a bluetooth address?
So the question: are there any small chips or devices (no larger than a standard key) that constantly broadcast a bluetooth address?