NodeRed Introduction

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Installation

1. Update your system.

sudo apt-get update
sudo apt-get upgrade -y
    

2. Install Node.js and npm.

sudo apt-get install nodejs
sudo apt install npm
    

3. Install Node-RED.

sudo npm install -g --unsafe-perm node-red node-red-admin
    

4. Test installation.

sudo ufw allow 1880
node-red
# In browser 127.0.0.1:1880
    

5. Can install new nodes in folder ~/.node-red

npm i node-red-node-email
npm i node-red-dashboard
    

6. Or click the manage palette, go to Install.

Troubleshootings

1. Require nodejs greater than 13. You can,

sudo apt update
curl -sL https://deb.nodesource.com/setup_14.x | sudo bash -
sudo apt install -y nodejs
node -v
    

Basics

1. Drag inject and debug to Flow.
2. Link them together.
3. Click Deploy.
4. At right hand panel, under info (ctrl+g i), click Trigger action for timestamp.
5. Under debug (ctrl+g d), you can see the message.
6. Can use function in between.

var newString = msg.payload.replace("world", "From Node-Red");
msg = {payload:newString};
return msg;
    

References

1. Step by step guide to install Node-RED on Ubuntu 18.04 LTS
2. node-red-node-mysql
3. Beginners Guide To The Paho MQTT Python Client
4. Intro to Node-RED: Part 1 Fundamentals
5. How to update Node.js to the long term support version on Ubuntu 20.04?

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