Vending machine cashless payments #103
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The vending machine talks to one of 2 possible cashless protocols. Apparently, you can remotely (quicker / spreadsheet sync!) set prices via coin module.
Door keycard would work for (credit) payments, but with (QR-code) LHV Connect (bank lightning transfers) does it timeout, or can you add credit before selection (and what about timeout refund transfers)?
Very bonus-bonus: Sales statistics.
See also: https://wiki.k-space.ee/en/utilities/vending-machine-manual (also has machine's PDF)
Depends on #76 succeeding.
The hardest part is the communication between Pi(/ESP) and the machine. Everything else (software) is easy, and can be done later.
There's a Multi Drop Bus (MDB) protocol hat for RPi (120€+tax+shipping, promo vid).
Unfortunately both of the manual files are not reachable.