Summary: The OPC Foundation released version 1.05 of the OPC UA specification with a revised security model, better support for edge-to-cloud communication, and PubSub improvements for MQTT and UDP transport.
Why It Matters for Developers
The improved security profiles matter for IT/OT integration projects. Developers building OPC UA clients from .NET applications should review the new certificate handling and authentication options. The enhanced PubSub model makes it easier to stream telemetry to cloud services without custom middleware.
My Take
For anyone connecting factory-floor systems to business applications, keeping up with OPC UA spec changes is non-optional. The security improvements are long overdue.