Do-it-yourself RFID reader from Arduino (maybe Esprune)?

Question

Arduino

Well, in general, at first glance, everything is simple, but in fact ...
For Arduino there is even a special shield based on PN532 (something like that), but how can I implement the NFC reader's functionality using bare Arduino without expansion cards? The antenna is available. Give, perhaps, a link to the NFC documentation or, maybe, a ready-made library, I will be grateful. Something is completely missing...

Answer 1

There seems to be a closed technology and you can't do anything without a chip.