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

Controlling output

The relay is connected to our digital output pin 9 on the Arduino board. As such, controlling it is a simple call to the digitalWrite() method on our arduino object. Since we will need to perform this control action from various locations in code in later chapters, we'll create a method for it:

internal async Task SetOutput(bool On, string Actor) 
   if (this.arduino != null) 
               On ? PinState.HIGH : PinState.LOW); 

The first parameter simply states the new value of the control parameter. We'll add a second parameter that describes who is making the requested change. This will come in handy later, when we allow online users to change control parameters.

Persisting control parameter states

If the device reboots for some reason, for instance after a power outage, it's normally desirable that it returns to the state it was in before it shut down. For this, we need to persist the output value. We can use the object database...