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If you want to do the absolute cheapest way with off the shelf parts (more off the shelf than an ESP32 board) something like this should work:

That would be what triggers the non-CAN relay-based Espar to start.

I've got a China-spacher diesel heater so am going the ESP32 route. I'm hoping I can learn the signaling on the wires from the Afterburner community, though the designer mentioned someone started selling knock-off's using his design and code so I may be on my own.
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