* Request: Computer agrees to wait for HW button press @auxend.

* Response: Device is waiting for HW button press.

* Response: Failure of the previous request @end.

* Structure representing BIP32 (hierarchical deterministic) node Used for imports of private key into the device and exporting public key out of device @embed.

* Request: Send passphrase back @next PassphraseStateRequest.

* Response: Device awaits encryption passphrase @auxstart @next PassphraseAck.

* Request: Send passphrase state back @auxend.

* Response: Device awaits passphrase state @next PassphraseStateAck.

* Request: Computer responds with encoded PIN @auxend.

* Response: Device is asking computer to show PIN matrix and awaits PIN encoded using this matrix scheme @auxstart @next PinMatrixAck.

* Response: Success of the previous request @end.

* Type of button request.

* Type of PIN request.