Corrosion alerts on parts nobody was watching
Field gateways — BeagleBone Black and Raspberry Pi over ethernet, Wi-Fi, or cellular — authenticating with rotating BCrypt-hashed keys and streaming temperature, humidity, pressure, vibration, and moisture into a time-series store. A rule engine evaluates per-asset thresholds including N-consecutive-breach conditions, each with its own cooldown, and grades alerts to email and Slack. High-value aerospace inventory had been sitting in storage with no monitoring at all.