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.

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Mastering Internet of Things
Peter Waher
Mar, 2018 | 410 pages
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Table of Contents (24 chapters)
Title Page
Title Page
Copyright and Credits
Copyright and Credits
Dedication
Dedication
Packt Upsell
Packt Upsell
Contributors
Contributors
Preface
Preface
Free Chapter
1
Preparing Our First Raspberry Pi Project
Preparing Our First Raspberry Pi Project
Getting what you need
Starting your Raspberry Pi
Creating your first project
Summary
2
Creating a Sensor to Measure Ambient Light
Creating a Sensor to Measure Ambient Light
Preparing our project
Sampling raw sensor data
Performing basic error correction
Converting to a physical quantity
Illustrating measurement results
Calculating basic statistics
Defining data persistence
Storing measured data
Removing old data
Summary
3
Creating an Actuator for Controlling Illumination
Creating an Actuator for Controlling Illumination
Preparing our project
Defining control parameters
Understanding relays
Connecting our lamp
Connecting an LED
Controlling output
Using Raspberry Pi GPIO pins directly
Summary
4
Publishing Information Using MQTT
Publishing Information Using MQTT
Introducing the MQTT protocol
Preparing our project
Publishing sensor data
Checking encrypted communication
Adding MQTT support to the actuator
Testing MQTT
Security considerations
Summary
5
Publishing Data Using HTTP
Publishing Data Using HTTP
Introducing the HTTP protocol
Preparing our project
Adding dynamic synchronous resources
Adding dynamic asynchronous resources
Summary
6
Creating Web Pages for Your Devices
Creating Web Pages for Your Devices
Adding file-based resources to your projects
Plotting graphs
Creating a menu system
Authenticating users
Protecting our web services
Summary
7
Communicating More Efficiently Using CoAP
Communicating More Efficiently Using CoAP
Introducing CoAP
Adding CoAP to our devices
Testing your devices
Securing your devices
Summary
8
Interoperability
Interoperability
Understanding the benefits of interoperability
Achieving interoperability using CoAP
Adding LWM2M to our devices
Testing your LWM2M device
Summary
9
Social Interaction with Your Devices Using XMPP
Social Interaction with Your Devices Using XMPP
Introducing XMPP
Adding XMPP to our devices
Summary
10
The Controller
The Controller
Discovering things on the internet
Registering our devices
Creating a controller
Summary
11
Product Life Cycle
Product Life Cycle
Defining ownership of data
Understanding provisioning
Adding provisioning support to our devices
Managing the owner side
Using tokens for identification
Testing provisioning
Summary
12
Concentrators and Bridges
Concentrators and Bridges
Introducing concentrators
Referencing embedded nodes
Managing a concentrator
Implementing a concentrator
Adding provisioning support to the concentrator
Summary
13
Using an Internet of Things Service Platform
Using an Internet of Things Service Platform
Understanding the IoT Gateway project
Running the IoT Gateway
Configuring the IoT Gateway
Providing web content
Monitoring performance
Developing services for the IoT Gateway
Summary
14
IoT Harmonization
IoT Harmonization
Envisioning the Smart City
Proposing a solution
Summary
15
Security for the Internet of Things
Security for the Internet of Things
Understanding the risks
Getting to a bad place
Understanding the root causes
Looking at alternative options
Getting to a better place
Mastering data protection technologies
Summary
16
Privacy
Privacy
Defining privacy
Introducing the GDPR
Solving the puzzle
Summary
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Index
Index

Storing measured data

We are now ready to store our measured data. We use the lastMinute field defined earlier to know when we pass into a new minute. We use that opportunity to store the most recent value, together with the basic statistics we've calculated:

if (!this.lastMinute.HasValue) 
   this.lastMinute = Timestamp.Minute; 
else if (this.lastMinute.Value != Timestamp.Minute) 
{ 
   this.lastMinute = Timestamp.Minute;

We begin by creating an instance of the LastMinute class defined earlier:

LastMinute Rec = new LastMinute() 
{ 
   Timestamp = Timestamp, 
   Light = Light, 
   Motion= D8, 
   MinLight = this.minLight, 
   MinLightAt = this.minLightAt, 
   MaxLight = this.maxLight, 
   MaxLightAt = this.maxLightAt 
};

Storing this object is very easy. The call is asynchronous and can be executed in parallel, if desired. We choose to wait for it to complete, since we will be making database requests after the operation has completed:

await Database.Insert(Rec);

We then clear our variables...

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