As the practical examples involve the use of AWS, an AWS account is required. The hardware requirements for this book include the following:

• Raspberry Pi 3
• Arduino Yún
• AWS IoT Button
• SimpleLink™ Wi-Fi® CC3220SF Wireless LaunchPad
• DHT22 Sensor
• LEDs
• Breadboard
• Jumper cables

The software requirements are as follows:

• AWS License
• Arduino Software
• Python and its libraries
• Node.js

You can download the example code files for this book from your account at www.packtpub.com. If you purchased this book elsewhere, you can visit www.packtpub.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

1. Log in or register at www.packtpub.com.
2. Select the SUPPORT tab.
3. Click on Code Downloads & Errata.
4. Enter the name of the book in the Search box and follow the onscreen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

• WinRAR/7-Zip for Windows
• Zipeg/iZip/UnRarX for Mac 
• 7-Zip/PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Learning-AWS-IoT . We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it from https://www.packtpub.com/sites/default/files/downloads/LearningAWSIoT_ColorImages.pdf.

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "To install the AWS IoT SDK for JavaScript, you can do so through the npm package."

A block of code is set as follows:

device
   .on('connect', function() {
     console.log('connected');
     device.subscribe('topic_1');
     device.publish('topic_1', JSON.stringify({ test_data: 1}));
   });

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

device
 .on('message', function(topic, payload) {
 console.log('recv:', topic, payload.toString());
});

console.log('Sensor subscriber started.');

Any command-line input or output is written as follows:

$ npm install aws-iot-device-sdk

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "You can click on the Get started button in the Configuring a device section".