OPC UA
OPC UA Advanced Driver
OPC UA is the most common protocol customers integrate with. Litmus Edge ships with several OPC UA drivers, but OPC UA Client Advanced is the one to use for new integrations.
Driver IDs
Driver name | Driver ID | When to use |
|---|---|---|
OPC UA Client Advanced | 2372E68F-BA1B-46E9-BC07-E92CA006B377 | Default for new integrations. Supports Browse, DynamicBrowse, StreamBrowse. |
OPCUA client | (legacy) | Older deployments only |
OPCUA client Poll | (legacy) | Older deployments only |
The two legacy drivers exist for backwards compatibility with collections created before Advanced was available. New work should use Advanced.
What "Advanced" gets you
- Browse: discover the full address space of the OPC server and import nodes as tags (no manual NodeId entry).
- DynamicBrowse: re-browse on-demand for servers whose address space changes.
- StreamBrowse: large-server browsing without loading the whole tree at once.
- Security policies: None / Basic128Rsa15 / Basic256 / Basic256Sha256, plus user / certificate auth.
- Subscription mode (push from server) and polling mode for servers without subscriptions.
Create a device with the Advanced driver
GraphQL CreateDevice mutation against /devicehub/v2. Minimum fields:
- DriverID: 2372E68F-BA1B-46E9-BC07-E92CA006B377
- Name: human label
- DeviceProperties: server URL (opc.tcp://host:port), security policy, auth, etc. - exact fields come from GetDriver template
Use GetDriver(ID: "2372E68F-...") to fetch the full property schema before constructing the mutation.
Device Discovery Tool
The Device Discovery Tool endpoint is OPC UA Advanced only. Point it at a server URL and it returns the server's endpoint descriptions, supported security policies, and certificates - useful before creating a device because you know exactly what security parameters the server accepts.
Browse a device's address space
Once a device exists:
- CreateBrowseTask - configure the browse (root NodeId, depth, etc.)
- StartBrowseTasks - run it
- BrowseTask_GetFoldersForTreeView, BrowseTask_GetFolderItems - read results
- Cart_AddItems -> Cart_CreateAllRegisters - turn selected nodes into tags
Embedded OPC UA server (export tags out)
Separate from the OPC UA client driver, Litmus Edge has an embedded OPC UA server that re-exposes DeviceHub tags to downstream OPC UA clients. APIs at /opcua/v2. See Configure OPC UA Server workflow.