The Host acts as the software stack that manages how data is structured and secured.
Handles the "raw bits" and frequency hopping across 40 channels to avoid interference. Inside bluetooth low energy
Bluetooth Low Energy (BLE) is essentially the "minimalist" sibling of classic Bluetooth, designed to stay in a near-zero power state and wake up only for tiny bursts of communication. This architecture allows devices like heart rate monitors and smart tags to run for years on a single coin-cell battery. The Host acts as the software stack that
Defines the "who's who." It determines if a device is a Central (like your phone) or a Peripheral (like a heart rate sensor). This architecture allows devices like heart rate monitors
Handles pairing and encryption to keep the data stream private. 3. The Application (The "User Interface") BLE with ESP32 tutorial part 1: the Server