They have two machines near the place I work.
An Astro Necta (food) and a Rondo Necta (coffee). They use blue RFID sticks called “Mark”made by Mei group.
They’ve a NXP PCF7931AS hitag2 chip inside.
I’ve no time to use them the way I’d like but since I was unable to find info about Necta machines I’ll publish it here.
Revisited attack with code for the GPU:
I’ve no idea it this actually works or not: http://www.xfpga.com/html_products/Hitag2-card-key-cloner-33.html