Node-RED

Menjalankan Node-RED

You must first install Node.js and Node-RED on your computer/device. If you don't have Node.js and Node-RED, you can follow the tutorial on the page https://nodejs.org/en/ and then https://nodered.org/docs/getting-started/installation.

Node-RED is a programming tool for connecting hardware devices, APIs, and online services in new and exciting ways. Node-RED provides a browser-based editor that makes it easy for users to connect flows with extensive use of nodes in a palette that can be directly applied with one click[1]. Node-RED is shared with Antares, MQTT, and other platforms/protocols. Once installed, Node-RED can be run by typing "node-red" at the command prompt.

Users can type "localhost:1880" or "IPv4-address:1880" in the browser to access Node-RED.

Node-RED Parts

In Node-RED, there are sections called nodes and flows. Nodes are the parts that are used to create the programme. There are several types of nodes: input, output, function, and others. The nodes can be downloaded in the "Manage palette" menu.

A window will appear. The "nodes" menu shows nodes that are already installed, while the "install" menu shows nodes that can be downloaded and installed.

A flow is a place to attach nodes. In one Node-RED window, there can be more than one flow. Flows are independent of each other.

Using MQTT

A. Node MQTT

MQTT nodes are already installed during the installation of Node-RED. There are two types of MQTT nodes: MQTT input and MQTT output.

B. MQTT Broker Setup

An MQTT node looks like this:

Adding a new broker can be done by selecting "add new mqtt-broker" and clicking on the right-hand icon. Setting up a broker can be done by simply clicking on the right-hand icon.

Users can name the new broker and set the server and port used.