For a successful Bluetooth pairing, here is a tip from a user:

  1. Go to the Bluetooth menu of your smartphone and cancel the existing pairing with the device to which you want to send barcodes via Bluetooth. Then turn off Bluetooth on this phone and then turn it on again.
  2. Go to the Bluetooth menu of your other device and cancel the existing pairing with this smartphone. Then turn off Bluetooth on this device and then turn it on again.
  3. Start this app on your smartphone.
  4. Now start the pairing from the other device.