MQTT in the Wild: What Industrial Monitoring Taught Me About Resilient Messaging For web developers walking into industrial MQTT for the first time. The Night the Line Didn't Stop It was 2 AM on a Tuesday when my phone buzzed with an alert from Honeybadger. A Python service that bridged our plant-floor MQTT broker to a PostgreSQL database had thrown 4,000 unhandled exceptions in twelve minutes. The service hadn't crashed — it was still running, still connected, still processing . It was just sil