Hi all,

we have an Android application (Java 17, SDK 34, Android 14, Zebra API3) which connects to a Zebra RFID reader (RFD8500) for tag scanning and inventory. We are using inventory function (connectedRfidReader.Actions.Inventory.perform();, or .stop();) to read all tags nearby. On this event (@Override method eventReadNotify), we want to set a logic that changes the reader volume, something like that:

@Override
    public void eventReadNotify(RfidReadEvents rfidReadEvents) {
        if (null != connectedRfidReader) {
            for (ReaderListener observer : observers) {
               observer.onGetReadTags(connectedRfidReader.Actions.getReadTagsEx(INVENTORY_READING_ITEMS));
            }
        }
        if(condition) {
        	try {
            	ReaderManager.getInstance().setVolumeBeeper(BEEPER_VOLUME.QUIET_BEEP);
            } catch (Exception e) {
                e.printStackTrace();
                throw new RuntimeException(e);
            }
      	} else {
      		try {
            	ReaderManager.getInstance().setVolumeBeeper(BEEPER_VOLUME.HIGH_BEEP);
            } catch (Exception e) {
                e.printStackTrace();
                throw new RuntimeException(e);
            }
      	}
    }

where ReaderManager.getInstance().setVolumeBeeper(BEEPER_VOLUME.HIGH_BEEP); is:

public void setVolumeBeeper(BEEPER_VOLUME volumeBeeper) {
        if (null != connectedRfidReader
                && connectedRfidReader.isConnected()) {
            try {
                connectedRfidReader.Config.setBeeperVolume(volumeBeeper);
                connectedRfidReader.Config.saveConfig();
            } catch (InvalidUsageException | OperationFailureException e) {
                e.printStackTrace();
            }
        } else {
            Toast.makeText(context, R.string.rfid_no_reader, Toast.LENGTH_SHORT).show();
        }
    }

The issue we're facing is that, whenever we call the method, we receive an exception (OperationFailureException). The weird thing is that if we call the same method from another part of the application, it works fine...

Can someone help?

Thanks in advance,

Claudia