This is a Project in progress using Sinatra, iptables and Ruby on Raspberry Pi 3 (raspbian-jessie-lite)
NOTE: this is a fine art project in TNUA Course, don't use for production
I'd follow the instruction in the following link which setup a RPi into wireless access point http://blog.itist.tw/2016/03/using-raspberry-pi-3-as-wifi-ap-with-raspbian-jessie.html