It would be easier to have a central device that could listen for any bluetooth signals that linger around the gas station all day long. Most people are gone wi

It would be easier to have a central device that could listen for any bluetooth signals that linger around the gas station all day long. Most people are gone within 5-10mins so it should be pretty obvious when there is a bluetooth device there for hours at a time that isn't a known device of someone that works there. But this would only be able to detect simple devices like these. Something a bit more advanced would stay in a listen only mode until the skimmer's owner came within range and would generate a random MAC addresses on bootup to evade pattern detection.