Articles

Practical SCADA notes

Field-oriented references for HMI/SCADA systems, industrial communication, alarms, tags, historians, and project delivery.

OPC UA PubSub over UDP: Prove the Packet Path Before You Trust a Single Tag

Jun 29, 2026/OPC UA/7 min read/12 views

Commissioning OPC UA PubSub (Part 14, UADP over UDP) without shipping stale values as live: dataset contracts, VLAN checks, and reboot-only failures.

Jun 25, 2026/MQTT/6 min read/7 views

Versioning MQTT telemetry payloads so historians, HMI clients, MES connectors and analytics survive a field change instead of breaking on one.