OPC UA, MQTT, and Sparkplug B: how they fit together
Three technologies that get compared as rivals but usually work as layers. What each one owns, and how to stop choosing between them.
OPC UA PubSub
OPC UA's scalable publish/subscribe communication model.
OPC UA Publish-Subscribe: a connection-oriented or connectionless OPC UA communication model for one-to-many and many-to-many distribution. UDP with UADP or MQTT/AMQP mappings can serve different scale, routing, and timing needs.
Use the concept: Industrial data connectivity: from register to consumer · Industrial data contract template
In depth
OPC UA security: a practical model for certificates, users, and trust
A field guide to OPC UA application identity, encrypted channels, user authentication, trust lists, and the operational work that keeps them healthy.
OPC UA companion specifications: a guided tour
The base standard models anything; companion specs model your industry. How to find, read, and actually use them.