function ac(options) {
  this.options=options;
  this.sensor=null;
  this.act = {
    start: function () {
      log('Starting .. '+this.options.msg)
    },
    percept: function () {
      rd.try(0,['SENSOR',_],function (t) {
        if (t) this.sensor=t[1];
      })
    },
    action : function () {
      log(this.sensor);
    },
    stop: function () {
      log('Terminating ..')
      kill()
    }
  }
  
  this.trans = {
    start:"percept",
    percept: function () { 
      if (this.sensor!=null) return "action";
      else return "stop";
    },
    action:"stop"
  }
  this.next="start";
}

out(['SENSOR',1000])
var ag1 = create(ac,{msg:'with pace'},2);

start();