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

Learning the MQTT protocol and using an MQTT node

Now that the sensor data has been successfully acquired, let's send that data to the server.

We usually select a protocol suitable for the content being transmitted; for example, when exchanging mail, we use SMTP. Currently, HTTP is used as a general-purpose protocol on the internet.

For example, HTTP is used for various communications on the internet, such as displaying web pages in a browser and exchanging data between servers. HTTP is a protocol created for exchanging content on the internet. In many cases, network devices such as routers and firewalls on the internet are set to allow HTTP communication to be used for various purposes, and HTTP is compatible with the internet.

In the IoT world, MQTT is often used as a general protocol instead of HTTP. This means that the MQTT protocol is the standard of the IoT world, just as the HTTP protocol is the standard of the web world.

MQTT (short for MQ Telemetry Transport...