code: function Client(arg, port) {
    if (this instanceof Client === false) {
      return new Client(arg, port);
    }
  
    if (arg === undefined) {
      throw new TypeError('arg should be a host address, name or universe');
    }
  
    this.host = Number.isInteger(arg) ? e131.getMulticastGroup(arg) : arg;
    this.port = port || e131.DEFAULT_PORT;
    this._socket = dgram.createSocket('udp4');
  }
docs: E1.31 client object constructor