OPC UA

6 min

OPC UA (LE)

27 endpoints. GraphQL on /opcua/v2. Manages the embedded OPC UA server that re-exposes DeviceHub tags to downstream OPC UA clients.

Run these endpoints: open the OPC UA folder on api.litmus.io.

This is distinct from the OPC UA Advanced client driver (used to read from external OPC UA servers). The client driver lives under DeviceHub. The server lives here.

Sub-areas

Folder	Purpose
Hierarchy	Browse and edit the OPC UA address space the embedded server exposes
Management	Service config, endpoints, certificates, users
Connections	Currently connected OPC UA clients

Typical operations

Hierarchy

Operation	Purpose
GetNodeRoot	Read the root of the namespace
GetNodes(ParentID)	Children of a node
CreateNode	Add a node (folder or variable)
DeleteNode	Remove
ImportAllDHTags	Bulk-import every DeviceHub tag as an OPC UA node
ImportSomeDeviceHubTags	Selective import (by device or tag IDs)
ClearAllNodes	Wipe the address space

Management

Operation	Purpose
GetServiceConfiguration	Endpoint URL, security policies, anonymous toggle
UpdateServiceConfiguration	Edit
StartOPCUAService, StopOPCUAService	Lifecycle
ListUsers, CreateUser, DeleteUser	Server users (for username/password auth)
GetCertificate, RegenerateCertificate	Server cert

Connections

Operation	Purpose
ListConnections	Currently connected clients
DisconnectClient	Force-disconnect by session ID

See Configure OPC UA Server workflow.