To respect social distancing rules, as well as knowing if you've come across someone that doesn't know that got the CoVid-19.
Using IOT to ease hot flashes and avoid night sweats.
Check who's snooping in your room when you're gone!
This is data communication over Bluetooth radio, the interface theory and operation of a Bluetooth module, and UART communication.
Simple alarm device using M5Stack Atom Lite (ESP32 Pico), Bluetooth Low Energy or WiFi TCP server, Immediate Alert Service