raspberrypi-coin.txt

please insert coin
1 peso = 5 minutes 
5 pesos = 25 minutes
display how much coins inserted
timeout 60 seconds or confirm using button
check if unifi controller available
generate voucher 
display or print voucher
return display to please insert coin

bandwidth upload/download can be changed in code
vouchers can set to be one time use or multiple use

unifi controller can be on raspberry pi, on premise server or cloud server
includes all unifi controller features: hotspot manager, statistics, portal customization etc.