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Getting Started with Bluetooth Low Energy
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With Bluetooth Low Energy (BLE), smart devices are about to become even smarter. This practical guide demonstrates how this exciting wireless technology helps developers build mobile apps that share data with external hardware, and how hardware engineers can gain easy and reliable access to mobile operating systems., This book provides a solid, high-level overview of how devices use BLE to communicate with each other. You'll learn useful low-cost tools for developing and testing BLE-enabled mobile apps and embedded firmware and get examples using various development platforms—including iOS and Android for app developers and embedded platforms for product designers and hardware engineers.
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Kevin Townsend, Carles Cufí,
Akiba, and Robert Davidson
Getting Started with Bluetooth
Low Energy
Getting Started with Bluetooth Low Energy
by Kevin Townsend, Carles Cufí, Akiba, and Robert Davidson
Copyright © 2014 Kevin Townsend, Carles Cufí, Akiba, and Robert Davidson. All rights reserved.
Printed in the United States of America.
Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.
O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions are
also available for most titles (http://my.safaribooksonline.com). For more information, contact our corporate/
institutional sales department: 800-998-9938 or corporate@oreilly.com.
Editors: Brian Sawyer and Mike Loukides
Production Editor: Melanie Yarbrough
Proofreader: Eliahu Sussman
Indexer: Judith McConville
Cover Designer: Karen Montgomery
Interior Designer: David Futato
Illustrator: Rebecca Demarest
May 2014:
First Edition
Revision History for the First Edition:
2014-04-29: First release
See http://oreilly.com/catalog/errata.csp?isbn=9781491949511 for release details.
Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered trademarks of O’Reilly
Media, Inc. Getting Started with Bluetooth Low Energy, the image of a Mousebird, and related trade dress
are trademarks of O’Reilly Media, Inc.
Many of the designations used by manufacturers and sellers to distinguish their products are claimed as
trademarks. Where those designations appear in this book, and O’Reilly Media, Inc. was aware of a trademark
claim, the designations have been printed in caps or initial caps.
While every precaution has been taken in the preparation of this book, the publisher and authors assume
no responsibility for errors or omissions, or for damages resulting from the use of the information contained
herein.
ISBN: 978-1-491-94951-1
[LSI]
Table of Contents
Preface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
1.
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
What Makes BLE Different 1
The Specification 3
Configurations 3
Based on Specification Support 3
Based on Chip Count 5
Key Limitations 6
Data Throughput 6
Operating Range 8
Network Topology 9
Broadcasting and Observing 9
Connections 10
Protocols versus Profiles 12
Generic Profiles 13
Use-Case-Specific Profiles 13
2.
Protocol Basics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Physical Layer 16
Link Layer 17
Bluetooth Device Address 19
Advertising and Scanning 19
Connections 22
Host Controller Interface (HCI) 24
Logical Link Control and Adaptation Protocol (L2CAP) 25
Attribute Protocol (ATT) 26
ATT operations 26
Security Manager (SM) 28
iii
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