There’s recent research from Faculty of Sciences and Technology, Bansomdejchaopraya Rajabhat University, Bangkok on Development of Prototypical Indoor Real-time Location System for Medical Equipment Management Based on BLE Devices.
The research proposes a prototype for an indoor real-time location system (RTLS) using Bluetooth Low-Energy devices for tracking medical equipment. The ESP32 microcontroller acts as a receiver node in each room, collecting the MAC address from the HM-10 beacon attached to the equipment and sending this data to a web server.
To calculate the distance between the node and the beacon, the Received Signal Strength value is filtered to reduce noise. Tests show that the average distance error between the beacon and node is roughly 3 metres and and the maximum time to update the location from node to node is less than 15 seconds.
This solution offers precise timestamps and location information based on distance, range, duration or direction.