Unlike "Classic" Bluetooth, which is designed for continuous data streaming (like headphones), BLE is designed for short bursts of data. This makes it ideal for devices that need to run on a coin battery for years, such as fitness trackers, smart door locks, and environmental sensors.
The app commands the dongle to scan the radio environment for "advertising packets." It displays a list of all BLE devices nearby, showing their names, signal strength (RSSI), and unique MAC addresses. This is crucial for checking if a prototype device is actually broadcasting correctly.