The MDPI has a special issue of Sensors Journal with a collection of papers related to Bluetooth LE.
BLE applications can be found in a wide range of domains, e.g., smart home, smart cities, smart health, smart agriculture, or Industry 4.0. BLE is enabling the interaction between humans and smart objects, as well as between smart objects themselves. BLE has also been leveraged for innovative location-based applications, opportunistic data collection and crowd-sensing.
All the papers are available free of charge under open access:
Detecting Proximity with Bluetooth Low Energy Beacons for Cultural Heritage
Optimizing the Bluetooth Low Energy Service Discovery Process
Empirical Study of a Room-Level Localization System Based on Bluetooth Low Energy Beacons
Obstruction-Aware Signal-Loss-Tolerant Indoor Positioning Using Bluetooth Low Energy
Efficient Communication Scheme for Bluetooth Low Energy in Large Scale Applications
Experimental Evaluation of 6BLEMesh: IPv6-Based BLE Mesh Networks
Energy Modeling of Neighbor Discovery in Bluetooth Low Energy Networks
Bluetooth 5.1: An Analysis of Direction Finding Capability for High-Precision Location Services