protected void startApp() throws MIDletStateChangeException {
    InPort5V inport = null;
    OutPort5V outport = null;
    try {
        m_Cmd = new ATCommand(false);
        m_Cmd.addListener(m_Listener);
        String Response = m_Cmd.send("-AT+CMEE=2\r");
        System.out.println(Response);

        Response = m_Cmd.send("ati\r");
        System.out.println(Response);

      Vector pins = new Vector(2);
      pins.addElement("GPIO21");
      pins.addElement("GPIO20");

      inport = new InPort5V(pins);
      inport.addListener(new gpioListener());
    } catch (IOException e) {
      e.printStackTrace();
    }   catch (ATCommandFailedException ex) {
            ex.printStackTrace();
        }
    catch (IllegalStateException ex) {
            ex.printStackTrace();
        } catch (IllegalArgumentException ex) {
            ex.printStackTrace();

        }

    int a = 0;
    boolean run = true;
      System.out.println("Inport : " + inport);
    while (run) {

      a++;
      if(a > 20)
      {
          try {
              inport.release();
          } catch (IOException ex) {
              ex.printStackTrace();
          } catch (OperationNotSupported ex) {
              ex.printStackTrace();
          }
          destroyApp(true);
          run = false;
      }
      try {
        Thread.sleep(4000);
        System.out.println(inport.getValue());
      } catch (InterruptedException e) {
        e.printStackTrace();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
     destroyApp(true);
  }
 }