Required hardware (hw wishlist):

• FIDO U2F/WebAuthn NFC device
• USB NFC reader

Requires:

• FIDO2: Bluetooth Low Energy (BLE) support (native support) #3 CTAP2 implementation
• FIDO2: U2F support (downgrade to U2F) #10 CTAP2 to CTAP1 (U2F) downgrade support

Includes:

• Looking into libnfc and neard
• Protocol negotiation via NFC
• Framing for CTAP1
• Framing for CTAP2