Reference architecture for moving OPC UA and MQTT plant data into a digital twin: buffering, store-and-forward, schema, late data, and twin state sync.
EMQX 6.3 is the new LTS. Strict MQTT parsing, Feature Gates, locked Prometheus and ACL defaults: every breaking change vs 5.8 LTS and a safe upgrade plan.
NATS JetStream vs Kafka for edge and IIoT telemetry: footprint, delivery guarantees, leaf nodes vs partitions, back-pressure and cost - a 2026 architecture decision record.
OPC UA FX vs MQTT Sparkplug B compared for the Unified Namespace: machine-level field exchange vs enterprise event bus, TSN, payloads, when to bridge. 2026 decision guide.
A hands-on NAMUR Open Architecture (NOA) tutorial: the second monitoring channel, verification of request, a read-only OPC UA diode, and edge analytics without touching the DCS.