triggerCMD.js

var exec = require('child_process').exec;
var app = require('express.io')();
    app.http().io();

function execCmd (argument) {
  child = exec(argument,
    function (error, stdout, stderr) {
      console.log('stdout: ' + stdout);
      console.log('stderr: ' + stderr);
      if (error !== null) {
        console.log('exec error: ' + error);
      }
  });
}

function sendCmd(cmd){
  switch (cmd){
  case 'r00':
      execCmd('sudo ./relay 0 0');
      break;
  case 'r01':
      execCmd('sudo ./relay 0 1');
      break;
	case 'r10':
      execCmd('sudo ./relay 1 0');
      break;
	case 'r11':
      execCmd('sudo ./relay 1 1');
      break;
  default:
      break;
  }
  execCmd(cmd);
}

app.get('/light',function(req,res){
  sendCmd('r00');
  res.send('');
});

app.listen(8081);
console.log('App\'s Default Listening:',8081);