Magnetic touch aint gonna be a next time

I highly recommend reading SparkFun's blog post about the process (at the first source link below), but essentially, the app searches for nearby Bluetooth devices with an ID of 'HC-05.' That's the device name of a popular skimmer chip, which SparkFun obtained for analysis and testing. Once the app finds a matching device, it tries to connect with the default password of 1234. Finally, the app sends the letter 'P' to the device, and if the device responds with 'M', there's probably a card skimmer nearby.

Magnetic Touch Aint Gonna Be A Next Time