There are many possible interactions between devices and users in the world of the Internet of Things, and before we start this chapter I want to give you an overview of all the possible scenarios.
The one we have already seen in this book is machine-human interaction, where we use an IoT device to log data on a server, which is then used to display a graph that can be understood and used by the final user.
The second type of interaction is human-machine interaction, where the user is triggering a command to a remote device, for example, to activate a lamp remotely.
Finally, the last scenario is machine-to-machine interaction, where two or more devices are directly talking to each other, without the intervention of any human. This is the type of interaction that we are going to focus on in this chapter.
