The project is currently on hold. The accuracy of normal Bluetooth device detection is too imprecise. For example, I recognize other devices / people walking outside past on the street 10 meters away. I will continue to follow the projects of Google and Apple as well as pepp-pt and will possibly continue to work on this solution here.
This project is paused because of the inaccuracy of normal Blutooth functions. The Kickstarter campaign was also stopped.