protected void onPairingRequestReceived(@NonNull final BluetoothDevice device,
											@PairingVariant final int variant,
											final int key) {
		// The API below is available for Android 4.4 or newer.

		// An app may set the PIN here or set pairing confirmation (depending on the variant) using:
		// device.setPin(new byte[] { '1', '2', '3', '4', '5', '6' });
		// device.setPairingConfirmation(true);

		// However, setting the PIN here will not prevent from displaying the default pairing
		// dialog, which is shown by another application (Bluetooth Settings).
	}
This method will be called if a remote device requires a non-'just works' pairing.
See PAIRING_* constants for possible options.

@param device  the device.
@param variant pairing variant.
@param key     pairing passkey, if supported by variant. -1 otherwise
ble/src/main/java/no/nordicsemi/android/ble/BleManager.java