Book Image

Internet of Things with Python

By : Gaston C. Hillar
Book Image

Internet of Things with Python

By: Gaston C. Hillar

Overview of this book

Internet of Things (IoT) is revolutionizing the way devices/things interact with each other. And when you have IoT with Python on your side, you'll be able to build interactive objects and design them. This book lets you stay at the forefront of cutting-edge research on IoT. We'll open up the possibilities using tools that enable you to interact with the world, such as Intel Galileo Gen 2, sensors, and other hardware. You will learn how to read, write, and convert digital values to generate analog output by programming Pulse Width Modulation (PWM) in Python. You will get familiar with the complex communication system included in the board, so you can interact with any shield, actuator, or sensor. Later on, you will not only see how to work with data received from the sensors, but also perform actions by sending them to a specific shield. You'll be able to connect your IoT device to the entire world, by integrating WiFi, Bluetooth, and Internet settings. With everything ready, you will see how to work in real time on your IoT device using the MQTT protocol in python. By the end of the book, you will be able to develop IoT prototypes with Python, libraries, and tools.
Table of Contents (19 chapters)
Internet of Things with Python
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Preface
Index

Sending and receiving data in real-time through Internet with PubNub


In Chapter 4, Working with a RESTful API and Pulse Width Modulation, we developed and consumed a RETful API that allows us to control electronic components connected to our Intel Galileo Gen 2 board through HTTP requests. Now, we want to send and receive data in real-time through the Internet and a RESTful API is not the most appropriate option to do this. Instead, we will work with a publish/subscribe model based on a protocol that is lighter than the HTTP protocol. Specifically, we will use a service based on the MQTT (short for MQ Telemetry Transport) protocol.

The MQTT protocol is a machine-to-machine (short for M2M) and Internet of Things connectivity protocol. MQTT is a lightweight messaging protocol that runs on top of the TCP/IP protocol and works with a publish-subscribe mechanism. It is possible for any device to subscribe to a specific channel (also known as topic) and it will receive all the messages published...