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esikich

- Monitor temperatures and get alerts before food spoils

- Get notified if a compressor fails, refrigerant leaks, or a door gets left open

- Catch failing fans, compressors, or defrost heaters before they break

- Automatically log temperatures for food safety inspections

- Optimize defrost cycles and compressor operation to save electricity

- Let technicians diagnose problems remotely instead of driving to the store

- Reduce power usage during peak electricity rates

- Monitor fridges and freezers across multiple stores from one place

- Track energy usage and equipment performance over time

- Get alerts when power goes out or equipment doesn't restart properly

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>Reduce power usage during peak electricity rates

This is the only one that requires remote write access, and only when "peak electricity rates" means a dynamic pricing system. But it doesn't actually need full Internet access. Instead, prices can be streamed via data diode to a local processor which calculates correct temperatures based on this information. This calculation should set reasonable limits on allowed temperature, so even if somebody sends false pricing information it's just going to waste some electricity and not destroy all the food.

>Optimize defrost cycles and compressor operation to save electricity

Assuming this means something different from "Reduce power usage during peak electricity rates", I don't see how it needs Internet access at all.

All the other points are monitoring tasks that can be done with read-only access via a separate data diode.

"full Internet access" is a term you brought here out of nowhere and is what your whole faulty premise hinges on.

The exact meaning isn't important. The point is that something like RS-422 with the TX lines removed is perfectly adequate for receiving pricing updates. Anything more complex than that is adding unnecessary attack surface.

Remote diagnostics is the only one of these functions that can fairly be said to require an internet connection. There are many remote connectivity solutions for low bandwidth, low latency needs like these that pose nowhere near as much of a risk as an internet connection.

Even the remote diagnostics is of questionable value at best. You can do remote diagnostics just as well with a faxed printout of system information and having store staff do manual resets at needed. Remote diagnostics isn't going to solve anything that requires more than a reboot, like replacing a compressor coil, anyway, so you're going to need service staff driving to stores for these with or without the remote diagnostics.

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