die Norm reihe: ISO-IEC 14443 - Identification cards – Contactless integrated circuit cards
- a good spec pdf: https://sar.informatik.hu-berlin.de/research/publications/SAR-PR-2014-03/SAR-PR-2014-03_.pdf
some further questions
- How can an Android phone constantly be on the look for passive PICC = Proximity Integrated Circuit Cards … without draining battery like crazy??
  - and what does Peer-to-Peer Modus (nfc) change about that … can i as the sender be the active part (which is turned on on a button press) and send messages, which trigger a URL-open on the other phone
    - like: Android Beam was implemented
- What are the C APDU = Command APDU (nfc)s and R APDU = Response APDU (nfc)s to transmit a NDEF Message???
  - seems to be quite complex?
  - document in: from APDU to NDEF Message s
a good summary of physical stuff: https://www.elektronik-kompendium.de/sites/kom/1107181.htm
- and security things
a really good read: https://www.st.com/resource/en/datasheet/st25ta16k.pdf
NFC Types
how and what bytes are transmitted: NFC Application Layer
structure of that data: NDEF = NFC Data Exchange Format
AID = Application IDentifier (nfc)
on a rooted Android you can control the full APDU of a nfc connection … with eg: https://github.com/okanatas/NFCCardEmulator
a java library: https://github.com/sasc999/javaemvreader
modi:
- activ to passiv
  - eg: phone reading a tag
  - normaler modus
- activ to activ
  - Peer-to-Peer Modus (nfc)
- passiv to activ
  - Karten Emulations Modus
IsoDep (nfc) in Android the transport layer, on which you send the APDU = Application Protocol Data Unit (nfc) bytes…
- https://developer.android.com/reference/android/nfc/tech/IsoDep
Android Beam
- 2010 eingeführt, mit Android 10 abgeschafft…
  - anstelle wird Android Quick Share, or Android Nearby Share gemach, was auf Bluetooth und Wifi aufbaut und nicht NFC = Near Field Communication

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