Create your own framework: Node-red. First steps

Create your own framework: Node-red. First steps

Node-red is a framework thought for an iot solution. The framework is programmed using a graphical  interface. In this post we are going to focus on the first steps a user must know to start a node-red project. If you want to know the basics of Node-red you can go to this post:

An introduction to Node-Red

 

Installation

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

 

 Run

node-red

Now you can go to http://localhost:1880and start editing flows

 

Create a new node

https://nodered.org/docs/creating-nodes/first-node

Prepare the environment:

mkdir testNode
cd testNode/
npm init -y

 

edit package.json and add a “node-red” section:

“node-red”: {
       “nodes”: {
              “testNode”: “testNode.js”
       }
}

 

edit testNode.js:

module.exports = function(RED) {
    function TestNode(config) {
       RED.nodes.createNode(this, config);
       node.on("input",function(msg) {
           msg.payload = "test-node-value";
           node.send(msg);
       });
    }
    RED.nodes.registerType("testNode", TestNode);
}

edit testNode.html
    <script type="text/javascript">
    RED.nodes.registerType('testNode',{
    category: 'function',
    color: '#aa0099',
    name: {vfalue:""}
    },
    inputs:1,
    outputs:1,
    label: function() {
    return this.name || "test node";
    }
    });
    </script>

    <script type="text/x-red" data-template-name="testNode">
    <div class="form-row">
             <label for="node-input-name"><i
    class="icon-tag></i> Name</label>
                     <input type="text" id="node-input-name"
    placeholder="Name">
                            </div>
    </script>

    <script type="text/X-red" data-help-name="lower-case">
    <p>A simple node that converts the message payload to a test string</p>
    </script>
  

 

Utility

Create a node template:

       node-red-create-node <NodeName>

 

Deploy locally

sudo npm link
cd ~/.node-red/
npm link TestNode

Now you can edit it and use changes only restarting node-red.

 

Settings

https://nodered.org/docs/configuration

vi ~/.node-red/settings.json

uiPort number 
httpAdminRoot false|path
disableEditor true|false
httpStatic 
pathadminAuth object
...

 

API

https://nodered.org/docs/creating-nodes/node-js

https://nodered.org/docs/user-guide/

 

SEE ALSO:

TCP CLIENT ON ARDUINO BASED PLC

HOW TO PROGRAM ARDUINO BASED PLC THROUGH ETHERNET

HOW TO IMPLEMENT AN ARDUINO WEB SERVER

HOW TO CONNECT THE ETHERNET PORT ON V7 VERSION

AN INTRODUCTION TO AZURE IOT SOLUTION

Comments are closed.