@Override
 public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException {
     this.callbackContext = callbackContext;
     Log.d("WIFI", action);
     if(ACTION_START.equals(action)){
         PluginResult pgRes = new PluginResult(PluginResult.Status.OK, "Registered");
         pgRes.setKeepCallback(true);
         mWifiManager = (WifiManager) this.cordova.getActivity().getSystemService(Context.WIFI_SERVICE);
         this.reciever = new BroadcastReceiver()
         {
             @Override
             public void onReceive(Context c, Intent intent)
             {
                List<ScanResult> scanResults = mWifiManager.getScanResults();
                handleResults(scanResults);
             }
         };
         this.cordova.getActivity().registerReceiver(this.reciever, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
         callbackContext.sendPluginResult(pgRes);
         Log.d("WIFI", "inside " + action);
         return true;
     } else if (ACTION_SCAN.equals(action)){
         PluginResult pgRes = new PluginResult(PluginResult.Status.OK, []);
         pgRes.setKeepCallback(true);
         mWifiManager = (WifiManager) this.cordova.getActivity().getSystemService(Context.WIFI_SERVICE);
         mWifiManager.startScan();
         callbackContext.sendPluginResult(pgRes);
         Log.d("WIFI", "inside " + action);
         return true;
     } else if (ACTION_STOP.equals(action)){
  @Override
  public boolean execute(String action, JSONArray data, CallbackContext callbackContext)
      throws JSONException {
    reader.start();

    am.setStreamVolume(
        AudioManager.STREAM_MUSIC, am.getStreamMaxVolume(AudioManager.STREAM_MUSIC), 0);
    this.callbackContext = callbackContext;
    timedOut = false;

    Log.w(TAG, action);
    if (mute) {
      PluginResult dataResult = new PluginResult(PluginResult.Status.OK, "NOTFOUND");
      callbackContext.sendPluginResult(dataResult);
      return true;
    }

    final ACR35Controller self = this;

    final String loadKeyCommand = "FF 82 00 00 06 %s";
    final String authCommand = "FF 86 00 00 05 01 00 %s 60 00";
    final String defaultKey = "FF FF FF FF FF FF";
    String authKeyCommand = "FF 86 00 00 05 01 00 00 60 00";

    if (action.equals("getDeviceId")) {
      cordova
          .getThreadPool()
          .execute(
              new Runnable() {
                @Override
                public void run() {
                  reader.setMute(false);

                  reader.reset(
                      new AudioJackReader.OnResetCompleteListener() {
                        @Override
                        public void onResetComplete(AudioJackReader audioJackReader) {
                          reader.getDeviceId();
                        }
                      });
                }
              });
    }

    if (action.equals("getDeviceStatus")) {
      cordova
          .getThreadPool()
          .execute(
              new Runnable() {
                @Override
                public void run() {
                  reader.setMute(false);

                  reader.reset(
                      new AudioJackReader.OnResetCompleteListener() {
                        @Override
                        public void onResetComplete(AudioJackReader audioJackReader) {
                          reader.getStatus();
                        }
                      });
                }
              });
    }

    if (action.equals("readIdFromTag")) {
      executeAPDUCommands(new byte[][] {hexToBytes("FFCA000000")});
    }
    if (action.equals("readDataFromTag")) {
      executeAPDUCommands(
          new byte[][] {
            hexToBytes(String.format(loadKeyCommand, defaultKey)),
            hexToBytes(String.format(authCommand, "04")),
            hexToBytes("FF B0 00 04 10"),
            hexToBytes("FF B0 00 05 10"),
            hexToBytes("FF B0 00 06 10"),
            hexToBytes(String.format(authCommand, "08")),
            hexToBytes("FF B0 00 08 10"),
            hexToBytes("FF B0 00 09 10"),
            hexToBytes("FF B0 00 0A 10"),
            hexToBytes(String.format(authCommand, "10")),
            hexToBytes("FF B0 00 10 10"),
            hexToBytes("FF B0 00 11 10")
          });
    }
    if (action.equals("writeDataIntoTag")) {
      try {
        String dataString = data.get(0).toString();
        byte[] dataToWrite = new byte[128];
        Arrays.fill(dataToWrite, (byte) 0);
        byte[] dataBytes = hexToBytes(dataString);
        System.arraycopy(dataBytes, 0, dataToWrite, 0, dataBytes.length);

        String dataStringToWrite = bytesToHex(dataToWrite).replaceAll("\\s", "");
        String commandString1 = "FF D6 00 04 30" + dataStringToWrite.substring(0, 95);
        String commandString2 = "FF D6 00 08 30" + dataStringToWrite.substring(96, (96 * 2) - 1);
        String commandString3 =
            "FF D6 00 10 20" + dataStringToWrite.substring(96 * 2, (96 * 2 + 64) - 1);

        Log.w(TAG, dataStringToWrite);
        executeAPDUCommands(
            new byte[][] {
              hexToBytes(String.format(loadKeyCommand, defaultKey)),
              hexToBytes(String.format(authCommand, "04")),
              hexToBytes(commandString1),
              hexToBytes(String.format(authCommand, "08")),
              hexToBytes(commandString2),
              hexToBytes(String.format(authCommand, "10")),
              hexToBytes(commandString3),
            });
      } catch (java.lang.Exception e) {
        Log.w(TAG, e);
      }
    }

    Calendar calendar =
        Calendar.getInstance(); // gets a calendar using the default time zone and locale.
    calendar.add(Calendar.SECOND, timeOut);

    timer = new Timer();
    timer.schedule(new TimeoutClass(reader, self), calendar.getTime());

    PluginResult dataResult = new PluginResult(PluginResult.Status.OK, "IGNORE");
    dataResult.setKeepCallback(true);

    callbackContext.sendPluginResult(dataResult);
    return true;
  }