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We have over 2000 deployed over Europe in locksmiths, providing a form of key service to the public. Challenges include not DDoSIng our APIs, getting a correct configuration to not nuke SD cards, and ensure that a bad firmware push doesn't knock the network offline.

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Any links? I’d love to know more.

Sure ! https://parklink.asia/ https://rebadge.eu/

We've got a custom PCB which controls the touchscreen and prehipherals (LF and HF RFID readers), placed in a custom, tough ABS case (locksmiths are full of metal filings, which don't play nicely with electronics...)

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