code: function sendMessage (client, data, batchCallback) {
    var msg = data.msg;
    var offset = data.offset;
    var length = data.length;
    var port = data.port;
    var address = data.address;
    var callback = data.callback;
  
    client.send(msg, offset, length, port, address, function(err) {
      try {
        callback(err);
      } finally {
        batchCallback();
      }
    });
  }
docs: Send a single message over a UDP socket.
  
  @param {Socket} client - Socket to send data with
  @param {object} data - Details of the data to send
  @param {Function} batchCallback - Function to call when done