Introduction

In the previous chapters of this book, we learned how to interact with the Arduino board via the Web, either to visualize measurements made by the board, or to automatically interact with web services.

In this chapter, we are actually going to focus on something different: making two (or more) Arduino boards talk to each other and interact with each other, without any human intervention. This is known as Machine-to-Machine communications, and is a very exciting field of the IoT. Let's dive in!