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Bluetooth Low Energy: The Developer’s Handbook by Robin Heydon

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Chapter 7. The Link Layer

All this technology for connection and what we really only know more about is how anonymous we are in the grand scheme of things.

—Heather Donahue

The Link Layer defines how two devices can use a radio to transmit information between one another. This includes defining the detail of a packet, advertising, and data channels. It also defines procedures for discovering other devices, broadcasting data, making connections, managing connections, and ultimately sending data within connections. This is compounded by the challenges of wireless communication systems in the 2.4GHz ISM band, including interference, noise, and deep fades.

7.1. The Link Layer State Machine

Before we discuss packets and how they are used, it is important ...

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