function execute() {
  switch (trigger) {
    case TRIGGERS.SYSTEM_ASYNC:
    {
      if (context.counter > 0 && context.state) {
        context.counter -= context.segment;
        if (context.counter <= 0) {
          return [0];
        }
        sleep(100, true);
        return [context.counter];
      }
      break;
    }
    case 0:
    {
      cancelSleep();
      context.totalTime = inPorts[1].value;
      context.splitTime = context.totalTime / 100;
      context.segment = 4096 / context.splitTime;
      context.counter = 4096;
      context.state = true;
      sleep(100,true );
      return [context.counter];
    }
    case 2: // reset
    {
      context.state = false;
      cancelSleep();
      context.counter = 4096;
      return [context.counter];
    }
    default: break;
  }
  return [];
}