蓝牙低功耗技术详解：开发者必备
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收藏 6.25MB PDF 举报 "《Bluetooth Low Energy The Developer's Handbook》由Robin Heydon撰写，是一本针对蓝牙4.0低功耗（BLE）技术的开发指南，适合工程师、产品设计师和营销人员阅读。书中详细介绍了BLE技术如何区别于传统蓝牙，以及如何在低带宽应用中实现高效节能的设计。"
本文将深入探讨《蓝牙低耗能：开发者手册》中的核心知识点，旨在为读者提供关于蓝牙4.0低功耗技术的全面理解。
1. **蓝牙4.0低功耗（BLE）简介**
- BLE技术是针对那些对功耗极其敏感的设备设计的，如穿戴设备、健康监测器和智能家居产品，它们通常采用纽扣电池供电。
- 与传统蓝牙相比，BLE专注于低带宽、短距离通信，以减少能耗，从而延长电池寿命。
2. **BLE与传统蓝牙的区别**
- BLE的主要特点是快速传输小量数据，然后迅速进入休眠状态，降低功耗。
- 传统蓝牙适用于较高带宽的需求，如音频流媒体和大文件传输，而BLE则适用于传感器数据交换和简单控制指令等场景。
3. **BLE的工作机制**
- 数据包短暂发送：BLE设备通过发送极短的数据包来节省能源，这些数据包可能包含传感器读数或控制命令。
- 少量连接时间：BLE设备保持连接的时间非常有限，大部分时间处于断开状态，进一步降低功耗。
- 广播模式：BLE设备可以广播信息，无需预先建立连接，简化了通信过程。
4. **BLE的协议栈**
- BLE协议栈包括物理层、链路层、网络层、GATT（Generic Attribute Profile）层和应用层，每个层都有其特定的功能，共同确保低功耗和高效的数据传输。
5. **开发与应用**
- 对于开发者，手册将详细介绍如何构建BLE设备，包括硬件选型、固件开发、应用编程接口（API）的使用，以及如何进行设备配对和数据交换。
- 对于产品设计师，书中可能涵盖如何优化BLE设备的用户体验，以及如何利用BLE技术实现创新产品设计。
- 对于营销人员，了解BLE技术的优势可以帮助他们更好地推广和支持相关产品。
6. **安全与隐私考虑**
- BLE技术虽然节能，但安全性和隐私问题也不容忽视。手册可能讨论了如何实施加密和身份验证，以保护用户数据不被窃取。
7. **批量购买与定制**
- 书中提及出版商提供批量购买折扣，可能包括电子版书籍和定制内容，以适应企业培训、市场定位和品牌建设需求。
《蓝牙低耗能：开发者手册》是一部综合性的指南，它不仅涵盖了BLE技术的基本原理，还提供了实践经验与开发策略，对于想要掌握这一技术的读者来说，是一份宝贵的参考资料。
Preface
Sometimes, once in a lifetime, a new technology comes along that changes the world; for example,
AM radio, television, and wireless Internet. Bluetooth low energy is at the cusp of the next revolution
in wireless technology: a technology that can be embedded in products because it uses so little power
that it can be designed around a small battery that lasts for years.
This book explains how this technology came about, why it was designed the way it has been
designed, and how it works. It is written by one of the leading experts on Bluetooth low energy,
Robin Heydon, who has been involved in creating the specifications, interoperability testing, and
training.
This book is for anyone who is thinking about developing a product that incorporates Bluetooth
low energy, whether you are an engineer, an application developer, a designer, or you’re in
marketing.
For engineers, the book covers the details of how the complete system works, from the physical
radio waves up to the discovery of, connection with, and interface provided by that device.
For application developers, this book provides an understanding of the constraints imposed by
Bluetooth low energy on applications. It also presents a thorough description of the design goals and
implementation of these requirements.
For designers, the information contained herein will allow you to appreciate the particular
problems with designing Bluetooth low energy wireless products, from how the product might need to
work and how big a battery might be required to implement your ideas.
For everyone else, the book provides the background of why Bluetooth low energy was designed,
the design goals it tried to achieve, and how you can take something that radically changes the way
you can think of wireless technology and implement it in everything else.
The book is split into four parts:
Part I provides an overview of the technology, the basic concepts that guided the development of
Bluetooth low energy, the architecture of the system from the radio through the various protocol layers
up to the application layers, and finally, the new usage models that this new technology enables.
The second part goes into detail on how the radio chip—called a controller—functions. This is the
silicon chip that product designers need to incorporate into their end products. This part also covers
the radio, Direct Test Mode, and the Link Layer. In addition, it shows how to interact with the
controller from the upper-layer stack, called a host.
Part III goes into detail of how the host (the software stack) works. It covers the concepts and
details behind the main protocol used to expose attributes of a device. It also covers the security
models and how to make connections and bonds, or associate, two devices with one another.
In Part IV, you wrap up all the details by looking at the design considerations that a product or
application developer needs to consider. It starts by looking at the issues involving central devices.
Next, it looks at issues related to peripheral devices. Finally, it considers the entire problem
surrounding testing and qualification, typically the final part of any product that will be taken to
market.
If after reading the book you would like to learn more about Bluetooth low energy, there are a
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