@parallaxcontrol/node-red-control/biamp-tesira/biamp-tesira-connect.js

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

/*
 * Copyright (c) 2025 Parallax AV Design Inc.
 * All rights reserved.
 *
 * This software is licensed, not sold. You may not copy, modify, merge,
 * publish, distribute, sublicense, or sell copies of this file or substantial
 * portions of it except as expressly permitted by the LICENSE file included
 * with this package. Use is restricted to building manifests for the
 * Parallax Control Node-RED nodes. See LICENSE for details.
 */
const fs = require('fs');
const { exec } = require('child_process');
const net = require('net');

//connect to device
module.exports = function (RED) {
    function BiampTesiraConnect(config) {
        RED.nodes.createNode(this, config);
        var node = this;

        this.ipAddress = config.ip;
        this.username = config.user;
        this.password = config.pass;

        // Path to the named pipe for receiving responses
        const pipePath = '/var/www/html/commands/ssh_command_output_pipe';

        node.on('input', function(msg) {

            //OPEN PIPE FOR READING
            fs.open(pipePath, fs.constants.O_RDONLY, (err, fd) => {
                if(err){
                    node.error(`Pipe open error: ${err.message}`, msg);
                    node.status({ fill: "red", shape: "dot", text: "Pipe open error" });
                    return;
                }
                const pipe = new net.Socket({ fd });
                // Now `pipe` is a stream that can be used for reading from the FIFO.
                pipe.on('data', (data) => {
                const dataString = data.toString('utf-8');
                msg.payload = `${dataString}`;
                node.send(msg);// send to next node    
                if(dataString.includes('Command timeout or no response from device.')){
                    node.status({ fill: "red", shape: "dot", text:"Device not responding"});
                }
                else if(dataString.includes('Welcome to the Tesira Text Protocol Server...')){
                    node.status({ fill: "green", shape: "dot", text:"Connected"});
                }                 
                });

                pipe.on('error', (error) => {
                    msg.payload =  `${error}`;
                    node.send(msg);
                });

                pipe.on('end', (end) => {
                    msg.payload =  `${end}`;
                    node.send(msg);
                });
              });

            //CONNECT TO SSH DEVICE
            // Construct the command string
            const command = `/usr/bin/expect /var/www/html/commands/ssh_persistent_control.exp "${node.username}" "${node.password}" "${node.ipAddress}"`;
              
            // Run the expect script
            exec(command, (error, stdout, stderr) => {
                if (error) {
                    msg.payload = `biamp-tesira-connect.js, exec command error: ${error}, ${stdout}, ${stderr}`;
                    node.send(msg);// send to next node   
                    node.warn(`${stdout}`);
                    node.warn(`Error: ${stderr}`);
                    node.error(`Error: ${stderr}`, msg);
                    msg.payload = `Error: ${stderr}`;
                    // Update the status to reflect the error
                    node.status({ fill: "red", shape: "dot", text: "Error" });
                    return;
                } 
            });  
        });
    }
    RED.nodes.registerType("biamp-tesira-connect", BiampTesiraConnect);
};