Seems like it must not be that easy to implement, or it would already by in all the chips the way CANBus seems to be integrated in tons of stuff. One-wire stuf

Seems like it must not be that easy to implement, or it would already by in all the chips the way CANBus seems to be integrated in tons of stuff. One-wire stuff is so cheap, and and they have EEPROMS meant for exactly this kind of electronic marking(I believe it's what power adapters did before USB), and it can be done with pure software on an MCU costing pennies.