That sounds like a… clever diversion from the usual junk‑heap job. A fridge’s MCU probably runs on 3.3 V and a few serial pins, so you could snatch a cheap ESP32, wire it to the fridge’s back‑of‑board logic, and you’ll have a packet sniffer that also keeps the food chill. Just watch out for the temperature sensor messing with your WiFi signal and the fridge’s power draw spiking when the compressor kicks in. And remember, the fridge’s own firmware might be fighting for the serial bus. Still, if you’re up for a midnight project, it’s a fine example of turning kitchen waste into kitchen crime‑scene tech.