Protocol simulator

OPC UA Simulator

Use SPX to simulate OPC UA server behavior with realistic nodes, subscriptions, runtime state, and abnormal conditions.

What this simulator helps test

SPX works as an OPC UA simulator for address spaces, namespaces, node values, subscriptions, and client behavior. The simulator is tied to a running digital twin, so OPC UA clients can validate live behavior rather than only connecting to a static server.

Why SPX

SPX connects OPC UA protocol exposure with scenarios, state, and runtime control. This helps industrial software teams validate clients, gateways, historians, and middleware before the physical system or full lab setup is available.

Related quickstarts

OPC UA Simulator in 5 Minutes

Related docs

OPC UA communication docs

Related features

Connections & Protocol Behavior

Expose protocol connections as part of the running twin so software can validate live communication behavior.

Scenarios & Fault Validation

Recreate real-world scenarios, edge cases, timing issues, and failure modes before those problems reach hardware-dependent stages.

AI-Assisted Twin Generation

Generate digital twins from documentation, specifications, and engineering requirements with structured, reviewable outputs.

Related protocols

Modbus TCP Simulator

Emulate Modbus TCP behavior with realistic registers, timing, scaling, reads, writes, and fault conditions.

BACnet Simulator

Rehearse BACnet smart-building integrations with realistic objects, properties, schedules, alarms, and deterministic replay.

Related guides

OPC UA Simulator in 5 Minutes

Launch an OPC UA simulator in SPX, open the runtime UI, and verify live behavior with a standard client.

Developer resources

OPC UA example model

A process-cell OPC UA model for testing nodes, values, subscriptions, and industrial client behavior.

Industrial IIoT Pack

Industrial examples for process cells, workcells, controllers, gateways, Modbus, OPC UA, MQTT, HTTP, and SCPI.

Smart Building Pack

Smart-building examples for HVAC, lighting, safety, telemetry, BACnet, KNX, MQTT, Modbus, OPC UA, and Matter.

Model Catalog

Cataloged SPX models across building, industrial, energy, lab, and environment domains.