A raw TCP server using node's internal libuv bindings directly.

echo_raw.js

var TCP = process.binding('tcp_wrap').TCP;
function noop() {}
var server = new TCP();
server.bind("0.0.0.0", 3000);
server.listen(511);
server.onconnection = function (client) {
  console.log("connection!", client.getsockname(), client.getpeername());
  client.onread = function (buffer, offset, length) {
    if (!buffer) {
      client.close();
      console.log("Closing");
      return;
    }
    buffer = buffer.slice(offset, offset + length);
    console.log("onread", buffer.toString());
    var req = client.writeBuffer(buffer);
    req.oncomplete = noop;
  };
  client.readStart();
};