The Host acts as the software stack that manages how data is structured and secured.
This is the hardware layer responsible for actually sending and receiving signals over the 2.4 GHz band. Inside bluetooth low energy
This is the most important part for developers. It defines how data is exchanged using a hierarchy of Services and Characteristics (e.g., a "Battery Service" with a "Level" characteristic). The Host acts as the software stack that
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") It defines how data is exchanged using a
Handles the "raw bits" and frequency hopping across 40 channels to avoid interference.
Handles pairing and encryption to keep the data stream private. 3. The Application (The "User Interface") BLE with ESP32 tutorial part 1: the Server
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")