dnp3 4 Portable OT Detections: Writing Sigma Rules for DNP3 and Modbus Oct 12, 2026 Watching the Inside: CIP-015 INSM with Zeek and Suricata Feb 16, 2026 Speaking the Grid's Language: DNP3 on the Wire Feb 2, 2026 Why I Built a Fake Power Grid to Learn NERC CIP Jan 19, 2026