Show HN: Coldframe, a honeypot that poses as a supermarket fridge controller

Coldframe is a Python-based honeypot that impersonates supermarket refrigeration controllers (Danfoss and Dixell models) to detect and log cyberattacks. The tool mimics real systems by replicating authentic server headers, login pages, and APIs, allowing it to record attacker credentials, techniques, and exploit attempts without providing access to actual systems. It was created in response to a 2026 incident where attackers used default passwords and unpatched firmware to compromise refrigeration units across Europe.