Sensor beacons, suitable for IoT, detect environmental quantities and send the information via advertising and/or Bluetooth GATT. Beacons are available that can detect movement (accelerometer), temperature, humidity, air pressure, light and magnetism (hall effect), proximity (IR short range and PIR), heart rate, fall detection, smoke, gas and water leak.
Using Bluetooth Wireless Sensors
Beacon Proximity and Sensing for the Internet of Things (IoT)
Beacons as IoT Sensors
Detecting Temperature With Beacons
Detecting Movement With Beacons
Detecting Falling Using Beacons
Prognostics, Predictive Maintainance Using Sensor Beacons
Beacons and The 4th Industrial Revolution
Bluetooth Beacons in Factories, IoT and Industry 4.0
Sensor Beacon Matrix (pdf)
IoT Sensors Listed by Input Sensor Type and Output Protocol