There’s new research on a An Intelligent Low-Power Displaying System with Integrated Emergency Alerting Capability. The authors have implemented a wireless ePaper system showing static and dynamic information together with indoor locating based on Bluetooth beacons .
Unfortunately, the locating system is based on an empty room and the technique would be liable to fluctuations in the physical environment.
Read about Using Beacons, iBeacons for Real-time Locating Systems (RTLS)