Introduction to Bluetooth Low Energy

Darshan Murthy
Dec 24, 2020 · 5 min read

In recent years, advancements in wireless technologies and devices have revolutionized our understanding of the capability of wireless networks. from IoT devices to smartwatches use wireless technology such as Bluetooth to connect and communicate with other devices.

These wireless technologies use radio waves to transfer information. With radio waves, intended distances can be short, such as a few meters for Bluetooth or as far as millions of kilometres for deep-space radio communications.

In this article, we’ll be discussing Bluetooth low energy (BLE or Bluetooth Smart) which is a lightweight subset of classic Bluetooth. Bluetooth Low Energy was introduced as part of the Bluetooth 4.0 core specification and was specifically designed for devices to transfer information using less power.

Bluetooth Low Energy Key Concepts

Bluetooth Low Energy Architecture

1. GAP

The following illustration should explain the advertising process and how the advertising payloads and scan response payloads work.

2. GATT

3. GATT Transactions

The following diagram should illustrate to the data exchange process between a peripheral (the GATT Server) and a central device (the GATT Client), with the main device initiating every transaction

4. Services and Characteristics

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