var timerName = 'Timer';
var timerSeconds = 15;
var username = 'ChrisMissal';

var callback = function (response) { // if used for JSON-P
  var meta = response.meta;
  var data = response.data;
  console.log(meta);
  console.log(data);
};

var getNotifications = function () {
    device.ajax(
    {
      url: '',
      type: 'GET',
      headers: {
        'Content-Type': 'application/json'
      }
    },
    function onSuccess(body, textStatus, response) {
      var data;
      if(!(body && (data = JSON.parse(body)))) {
        console.error('error: ', body || '(null)');
      }

      console.info(JSON.stringify(data));
    },
    function onError(textStatus, response){
      console.error('error code: ', response.status);
    });
};

device.scheduler.setTimer({
      name: timerName,
      time: 0,
      interval: timerSeconds*1000,
      exact: false },
      getNotifications);

 device.screen.on('off', function () {
     device.scheduler.removeTimer(timerName);
 });