Tracker.autorun(function() {
  var id = Session.get('controller_id');
  Session.set("orientation", new Date());
  Session.set("resize", new Date());
  if (id) {
    Meteor.subscribe("sensor_data", id);
    Meteor.subscribe("controller_state", id);
    Meteor.subscribe('pictures', id);
  }
  window.addEventListener('orientationchange', function(){
    Session.set("orientation", new Date());
  });
  window.addEventListener('resize', function(){
    Session.set("resize", new Date());
  });
});