Hi, the RTL8711AM is a WIFI chip,our RAK473 is base on this chip design.
the RAK473 and CREATOR pro different is the software,the RAK473 is not open source code，the CREATOR pro is open source code.

Hi, the CREATOR pro development boadr have one ADC pin，you can achieve you idea.but you said the need to buide RTP Sever, it may need your own to achieve. Our library is not have example code fot this.

please connect NFC pins in RAK473(red circle) with NFC antenna, and download the program from:https://www.amebaiot.com/en/ameba-arduino-peripherals-examples/ ----this is the demo how to connect to NFC