websocket binary data test - socket.io

browser

io.sockets.on('connection', function (socket) {
  socket.on('message', function(data) {
    console.log(Buffer.isBuffer(data));
    console.log(data);

    var buf = new Buffer(5);
    buf.writeUInt8(0x3, 0);
    buf.writeUInt8(0x4, 1);
    buf.writeUInt8(0x23, 2);
    buf.writeUInt8(0x42, 3);
    buf.writeUInt8(0xff, 4)

    socket.send(buf);
  });
});

server

var socket = null;

$(function() {
  socket = io.connect();
  socket.on('message', function(data) {
    receiveBinary(data);
  });
  setTimeout(sendBinary, 1000);
});

function sendBinary() {
  var byteArray = new Uint8Array(4);
  byteArray[0] = 0x31;
  byteArray[1] = 0x10;
  byteArray[2] = 0xff;
  byteArray[3] = 0x20;

  socket.send(byteArray.buffer);
}

function receiveBinary(data) {
  console.dir(data);
}

the both side receive a typeof string