You're reading from Practical Node-RED Programming Learn powerful visual programming techniques and best practices for the web and IoT

Product type Paperback

Published in Mar 2021

Publisher Packt

ISBN-13 9781800201590

Length 326 pages

Edition 1st Edition

Languages

JavaScript

Tools

Node-Red

Concepts

Server Side Web Development

Author (1):

Taiji Hagino

View More author details

Table of Contents (19) Chapters

Preface

1. Section 1: Node-RED Basics

2. Chapter 1: Introducing Node-RED and Flow-Based Programming FREE CHAPTER

3. Chapter 2: Setting Up the Development Environment

4. Chapter 3: Understanding Node-RED Characteristics by Creating Basic Flows

5. Chapter 4: Learning the Major Nodes

6. Section 2: Mastering Node-RED

7. Chapter 5: Implementing Node-RED Locally

8. Chapter 6: Implementing Node-RED in the Cloud

9. Chapter 7: Calling a Web API from Node-RED

10. Chapter 8: Using the Project Feature with Git

11. Section 3: Practical Matters

12. Chapter 9: Creating a ToDo Application with Node-RED

13. Chapter 10: Handling Sensor Data on the Raspberry Pi

14. Chapter 11: Visualize Data by Creating a Server-Side Application in the IBM Cloud

15. Chapter 12: Developing a Chatbot Application Using Slack and IBM Watson

16. Chapter 13: Creating and Publishing Your Own Node on the Node-RED Library

17. Other Books You May Enjoy

Appendix: Node-RED User Community

Connecting to an MQTT broker

Now, let's send the sensor data on the Raspberry Pi to an MQTT broker via Node-RED. Here we will use the popular MQTT broker Mosquitto. In this chapter, we will go as far as preparing the device to send the device data to the server. The task of actually receiving and processing data on the server side will be demonstrated in a hands-on example in the next chapter. Therefore, here we will use Mosquitto just for checking the data transmission is performed correctly.

Mosquitto

Mosquitto is released under the open source BSD license and provides broker functionality for MQTT V3.1/v3.1.1.

It works on major Linux distributions such as RedHat Enterprise Linux, CentOS, Ubuntu, and OpenSUSE, as well as Windows. It also works on small computers such as the Raspberry Pi.

In this chapter, we will verify that the sensor data of the edge device can be sent via an MQTT broker to the localhost of the Raspberry Pi. This is very easy. I am confident that...