Book Image

Practical Node-RED Programming

By : Taiji Hagino
5 (1)
Book Image

Practical Node-RED Programming

5 (1)
By: Taiji Hagino

Overview of this book

Node-RED is a free and open source flow-based programming tool used to handle IoT data that allows programmers of any level to interconnect physical I/O, cloud-based systems, databases, and APIs to build web applications without code. Practical Node-RED Programming is a comprehensive introduction for anyone looking to get up to speed with the Node-RED ecosystem in no time. Complete with hands-on tutorials, projects, and self-assessment questions, this easy-to-follow guide will help you to become well versed in the foundations of Node-RED. You’ll learn how to use Node-RED to handle IoT data and build web applications without having to write complex code. Once you’ve covered the basics, you’ll explore various visual programming techniques and find out how to make sample flows as you cover web development, IoT development, and cloud service connections, and finally build useful real-world applications. By the end of this book, you’ll have learned how to use Node-RED to develop a real-world application from scratch, which can then be implemented in your business.
Table of Contents (19 chapters)
Section 1: Node-RED Basics
Section 2: Mastering Node-RED
Section 3: Practical Matters

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 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...