Inside Bluetooth Low Energy -

Handles pairing and encryption to keep the data stream private. 3. The Application (The "User Interface") BLE with ESP32 tutorial part 1: the Server

The Host acts as the software stack that manages how data is structured and secured. Inside bluetooth low energy

Defines the "who's who." It determines if a device is a Central (like your phone) or a Peripheral (like a heart rate sensor). Handles pairing and encryption to keep the data

To "put together" a BLE system, you need to understand three major building blocks that work in tandem: the , the Host , and the Application . 1. The Controller (The "Radio") Defines the "who's who

Handles the "raw bits" and frequency hopping across 40 channels to avoid interference.

The "brain" of the radio. It uses a state machine to manage whether the device is Advertising (broadcasting its presence), Scanning (looking for others), or in a Connection state exchanging data. 2. The Host (The "Brain")