NodeJS Script to Wake LG on LAN

lg-wake-on-lan.js

import dgram from "dgram";

const IP = "192.168.X.X";
const PORT = "9922";
const MAC = "XX:XX:XX:XX:XX:XX";

let sanitizedMac = MAC;
// remove filling from MAC
const CharsToRemove = ["\\.", ":", "-"];
for (let j = 0; j < CharsToRemove.length; j++) {
  sanitizedMac = sanitizedMac.replace(new RegExp(CharsToRemove[j], "g"), "");
}

// Build a magic packet (6 x 0xFF followed by 16 x MAC) and broadcast it
if (sanitizedMac.length === 12) {
  const Message = new Uint8Array(102);
  const MACstr = new Uint8Array(6);
  for (let j = 0; j < 6; j++) {
    Message[j] = 0xff;
    MACstr[j] = parseInt(sanitizedMac.substr(j * 2, 2), 16);
  }
  for (let j = 1; j <= 16; j++) {
    Message.set(MACstr, j * 6);
  }

  // Send Wake On LAN packet
  const LANDestination = {
    address: IP,
    port: parseInt(PORT, 10),
  };
  const buffer = Buffer.from(Message);
  const socket = dgram.createSocket("udp4");
  console.log(
    "Sending Wake On LAN packet to",
    LANDestination.address,
    "on port",
    LANDestination.port
  );
  socket.send(
    buffer,
    0,
    buffer.length,
    LANDestination.port,
    LANDestination.address,
    (err) => {
      if (err) {
        console.error("Error sending Wake On LAN packet:", err);
      } else {
        console.log("Wake On LAN packet sent successfully");
      }
      socket.close();
    }
  );
}