@parallaxcontrol/node-red-control/cm4-pro-serial/cm4-pro-serial.js

A comprehensive package of Node-RED nodes designed to seamlessly integrate with the Parallax Control Engine, offering enhanced control capabilities for AV Automation.

const { exec } = require('child_process');

module.exports = function(RED) {
    function Cm4ProSerial(config) {
        RED.nodes.createNode(this, config);
        var node = this;

        // Initialize configuration properties
        this.Mode = config.mode;
        this.Baudrate = config.baudrate;
        this.Databits = config.databits;
        this.Parity = config.parity;
        this.Stopbits = config.stopbits;
        this.Hardware = config.hardware;
/*
        # Input arguments
        MODE="$1"         # RS485-1, RS485-2, or RS232-1
        BAUDRATE="$2"     # e.g., 9600
        DATABITS="$3"     # e.g., 8
        PARITY="$4"       # e.g., N (None), E (Even), O (Odd)
        STOPBITS="$5"     # e.g., 1 or 2
        DATA="$6"         # The data to send
*/

        node.on('input', function(msg) {
            if (typeof msg.payload.Value !== 'string') {
                // Handle non-string payload
                node.warn(`Invalid input type: ${typeof msg.payload.Value}`);
                node.status({ fill: "red", shape: "ring", text: "Error: Payload must be a string." });
                return; // Stop further processing
            }

            // Construct the shell command using JSON.stringify only for msg.payload.Value
            let command = `. /var/www/html/commands/cm4ProSerial.sh ${node.Mode} ${node.Baudrate} ${node.Databits} ${node.Parity} ${node.Stopbits} ${JSON.stringify(msg.payload.Value)}`;
            node.warn(`Command: ${command}`); // Log the constructed command
            
            // Execute the command
            exec(command, { shell: '/bin/bash' }, (error, stdout, stderr) => {
                if (error) {
                    node.error(`Error: ${stderr}`, msg);
                    msg.payload = `Error: ${stderr}`;
                    node.send(msg);
                    return;
                }
                // Send the command output as payload
                msg.payload = stdout;
                node.send(msg);
            });
        });
    }

    RED.nodes.registerType("cm4-pro-serial", Cm4ProSerial);
};