This board is expected to face the user. It features:
a NFC reader chip, its PCB antenna,
a BLE transceiver,
a CAN controller,
interface to a textual LCD,
interface to a matrix keyboard,
some future extension ports.
Main use-case is to authenticate the user, and gain access to resources controlled by brain, the counterpart board. User interface is done through any of:
NFC ID cards (Mifare, etc.),
Phone NFC-based app,
Phone BLE-based app,
BLE beacon presence,
Identifier number input,
As a security controller frontend, this board should face the user, wherever he sits. This may be outside a building, in a place we cannot control. Therefore, this board has no built-in intelligence or secrets. It is just a frontend for its counterpart that sits hidden in a more secure place. They communicate through a CAN interface as it has good extensibility and resilience features.