We had one connected vending machine in the building. Its credit database was on a remote server, so such hacks would not work.
However, if you unplugged its ethernet connector and buy something, then somehow your would get your food/drinks and your transaction was stored into a buffer until the machine went online again.
That buffer being in volatile memory, unplugging the power cord of the machine was enough for it to forget you ever bought something.
However, if you unplugged its ethernet connector and buy something, then somehow your would get your food/drinks and your transaction was stored into a buffer until the machine went online again.
That buffer being in volatile memory, unplugging the power cord of the machine was enough for it to forget you ever bought something.