3.1.7.4 Pairing Indication
When the Bluetooth layer indicates to the client that a pairing attempt has to be authenticated, the client compares its state to the WAITING_FOR_PAIRING state, compares the indicated peer address with the Server Address, and compares the indicated authentication method to the numeric comparison. If all values match, the client MUST store the indicated Numeric Value and transition to the WAITING_FOR_CHALLENGE_REQUEST state; otherwise, the client MUST ignore the indication from the Bluetooth layer.