system consists of:

Rock pi S
32Gbyte SD card
playing with fussion IFB-40003 and DFrobot DFR0154 connected to smbus2
USB Thumbdrive for storing puck data 
USB printer Dymo LW450
USB Omnikey 5022 smart card reader
NTAG216 smart cards

a puck is a device that contains a smart card

a function called readButtons that reads the buttons and returns thier state as a binary value
a function called puckUID that looks for a puck on the reader and returns the UID if present or None if not present
a function called puckData that returns a string from the puck starting at block 1 offeset 9 and going until a null character 

The main program should loop forever attempting to connect to a smart card using puckUID.  
When a smart card is detected because puckUID does not equal None the puck data is read with the function puckData.
The data from the puck is a comma seperated string.