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

Sampling raw sensor data

After the database provider has been successfully registered, the persistence layer is ready to be used. We now continue with the first step in acquiring the sensor data: sampling. Sampling is normally done using a short regular time interval. Since we use the Arduino, we get values as they change. While such values can be an excellent source for event-based algorithms, they are difficult to use in certain kinds of statistical calculations and error-correction algorithms. To set up the regular sampling of values, we begin by creating a Timer object from the System.Threading namespace, after the successful initialization of the Arduino:

this.sampleTimer = new Timer(this.SampleValues,  
   null, 1000 - DateTime.Now.Millisecond, 1000);

This timer will call the SampleValues method every thousand milliseconds, starting the next second. The second parameter allows us to send a state object to the timer callback method. We will not use this, so we let it be null. We then...