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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