OPC-UA-PUBSUB

OPC UA MQTT UDP pub/sub extension.

Definition

OPC UA PubSub specifications: Part 14 (Pub-Sub), JSON or UADP (UA Datagram Protocol binary). Supported transports: UDP multicast (local LAN cell), MQTT (cloud broker), AMQP (enterprise). Use cases: SCADA edge-to-cloud streaming, M2M peer-to-peer, Time-Sensitive Networking (TSN) integration. Progressive adoption: Siemens SIMATIC S7-1500, Beckhoff TwinCAT, B&R Industrial, Honeywell. Synergy with OPC UA over TSN for deterministic real-time.

Origin

OPC UA PubSub specified in Part 14 published 2017 by OPC Foundation ; integrated in v1.04 OPC UA release.

Example in context

An automotive factory transmits 5000 PLC metrics to Azure IoT Hub via OPC UA PubSub MQTT JSON ; no client/server polling, sub-second push event-driven.

Related terms

• OPC UA spec — parent standard.