Contact person: Business Client

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Location: singapore, Singapore

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"I have a Model A vending machine already talking MDB, and I’ve added an RFID/NFC cashless module. Payment authorisation is coming through correctly, but the controller isn’t issuing the final dispense command. I need someone who has actually worked on VMC firmware to step in, review my existing source, and adjust the MDB sequence so the machine releases the product automatically once the cashless device signals a ​“payment-approved”.

You’ll get the current codebase, the MDB command log, and remote access to a bench-test rig with the reader attached. I’m looking for clean, minimal changes that keep the rest of the workflow untouched and maintain safety checks ( vend motor feedback, etc.).

Deliverables:
• Revised source files with clear comments on every change
• Build/flash instructions that compile on my toolchain
• A short test showing payment-to-dispense timing on at least two successful vends and unsuccessful vend.

I can run live tests here and share logs; if we hit any edge-cases I’ll provide additional traces for you to patch. Once everything vends reliably we’re done." (client-provided description)