gamepad.js

var mcs = require('mcsjs');

// regist your device to mcs.
var myApp = mcs.register({
  deviceId: 'Input your deviceId',   // Input your deviceId.
  deviceKey: 'Input your deviceKey', // Input your deviceKey.
});

var SerialPort = require("serialport").SerialPort;
var serialPort = new SerialPort("/dev/ttyS0", {
  baudrate: 57600
});

// communicate with Arduino chip (32U4).
serialPort.on("open", function () {
  // listen the mcs command.
  myApp.on('gamepad', function(data, time) { // gamepad is your datachannel.
    serialPort.write(data); // send message to Arduino chip.
  });
});