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Basically the esp32 broadcasts BLE, and when you send it an on or off message, it toggles power to the output side USB port. Nothing too fancy. Then in tasker on my phone I send it "ON" when my phone connects to the cars headunit, "OFF" when it dissconnects. Simple, but so is just unplugging it

Technically I guess even the PCB one is a bit prototype still. For a real product you wouldn't use a dev board. But it's cheap, easy to program, and I can still pull logs off it if I need to debug or update anything

The photos are the various stages it went through. A couple of breadboards to validate the idea. Then the grey prototype made with perfboard. Reworked it a little and moved it to the orange case. Worked decent in there so I turned that into a more finalized PCB.