Rewrited artnet-node

main.js

const Server = require("./server");

Server.listen(6454, function (...arg) {
  console.log(arg);
});

Server.js

import util from "util";
import events from "events";
import dgram from "dgram";

// ArtNet server class
const listen = function (port, cb) {
  this.port = port;
  events.EventEmitter.call(this);

  // Set up the socket
  const sock = dgram.createSocket("udp4", function (msg, peer) {
    const data = new Array();
    for (let i = 0; i < msg.length; i++) {
      let d = msg.toString().charCodeAt(i);
      // Since we can't do unsigned 8-bit integers, do some normalization
      if (d < 0) {
        d = 0;
      } else if (d > 255) {
        d = 255;
      }

      // Append the byte to the array
      data.push(d);
    }

    // Deseralize the data - magic numbers are as per the Art-Net protocol
    const sequence = data[12];
    const physical = data[13];
    const universe = data[14] * 256 + data[15];
    const length = data[16] * 256 + data[17];

    const rawData = new Array();
    for (let i = 0; i < length; i++) {
      rawData.push(data[i + 18]);
    }

    // Build the associative array to return
    const retData = {
      sequence: sequence,
      physical: physical,
      universe: universe,
      length: length,
      data: rawData,
    };

    // And call the callback passing the deseralized data
    cb(retData, peer);
  });
  sock.bind(port);
};

// Setup EventEmitter for the ArtNetServer
util.inherits(listen, events.EventEmitter);

export { listen };