Book Image

Mastering Internet of Things

By : Peter Waher
Book Image

Mastering Internet of Things

By: Peter Waher

Overview of this book

The Internet of Things (IoT) is the fastest growing technology market. Industries are embracing IoT technologies to improve operational expenses, product life, and people's well-being. Mastering Internet of Things starts by presenting IoT fundamentals and the smart city. You will learn the important technologies and protocols that are used for the Internet of Things, their features, corresponding security implications, and practical examples on how to use them. This book focuses on creating applications and services for the Internet of Things. Further, you will learn to create applications and services for the Internet of Things. You will be discover various interesting projects and understand how to publish sensor data, control devices, and react to asynchronous events using the XMPP protocol. The book also introduces chat, to interact with your devices. You will learn how to automate your tasks by using Internet of Things Service Platforms as the base for an application. You will understand the subject of privacy, requirements they should be familiar with, and how to avoid violating any of the important new regulations being introduced. At the end of the book, you will have mastered creating open, interoperable and secure networks of things, protecting the privacy and integrity of your users and their information.
Table of Contents (24 chapters)
Title Page
Copyright and Credits
Packt Upsell

Introducing CoAP

There are several problems with using HTTP for resource-constrained devices. HTTP is verbose and requires a lot of bytes for headers. These headers are in plain text, and since HTTP has grown over time, there are a lot of headers that need to be supported to achieve compliance with the standards. This forces implementations to become large, which might be a problem if the device has limited memory. CoAP is much simpler and has less options, and therefore has a smaller code footprint than HTTP.


CoAP is an Internet Engineering Task Force (IETF) standard and is defined in RFC 7252:

At the same time, the amount of data in the payload is often small. A sensor value can be encoded in just a few bytes. The great difference between number of bytes sent and number of content bytes sent implies a great waste. This waste of bandwidth is particularly noticeable in resource-constrained networks, such as the IPv6 radio-based network 6LoWPAN (IPv6...