What is Bluetooth Mesh?

Unlike wireless lighting systems like Wi-Fi, Bluetooth Mesh is designed for large collections (thousands) of devices i.e. switches, HVAC, sensors, light fixtures, and shades that can communicate with each other by forwarding a message (command) across all the devices in that Bluetooth chain until reaching the destination to perform said operation, (i.e. turn ON the 3rd floor office lights).  The communication, instead of passing through your WiFi router, comes from the originating device and travels from light fixture to sensor, to AC unit, to any other chain of Bluetooth Mesh enabled devices, like a Bluetooth highway or your central nervous system, until the command reaches the lights on the 3rd floor. (Read more about Bluetooth Mesh here.)