@brdk/node-red-opcua 1.0.1
A modern, clean Node-RED OPC UA client library for interacting with OPC UA servers
@brdk/node-red-opcua
A modern, clean Node-RED OPC UA library for interacting with OPC UA servers and building your own.
Nodes
Client Nodes
| Node | Description |
|---|---|
| OPC UA Client | Main workhorse — reads, writes, subscribes, browses, calls methods, transfers files, and more. Supports 20+ actions with persistent connection management. 3 outputs: data, status, batch. |
| OPC UA Endpoint | Configuration node storing server connection details — URL, security mode/policy, and authentication credentials. Referenced by Client, Method, and Event nodes. |
| OPC UA Item | Prepares a single OPC UA node reference (nodeId, datatype, browseName) on msg.items for downstream Client operations. |
| OPC UA Smart Item | Multi-item selector with a live address space browser in the editor. Outputs one or more items with optional static values. |
| OPC UA Action | Configures the action type (subscribe, browse, history, acknowledge, method, etc.) and action-specific settings on the message for the Client node. |
| OPC UA Event | Sets msg.topic and msg.eventTypeIds for event subscriptions. Supports standard and custom OPC UA event types. |
| OPC UA Method | Calls a single OPC UA method with up to 3 input arguments and returns the result. Opens its own connection per invocation. |
Server Nodes
| Node | Description |
|---|---|
| OPC UA Server | Creates and manages a full OPC UA server with dynamic address space management — variables, folders, methods, alarms, files, and namespaces. 2 outputs: session events, status. |
| OPC UA Command | Sets msg.command for server-side operations — addVariable, deleteNode, addMethod, installAlarm, and more. |
| OPC UA Rights | Builds OPC UA access level flags, user roles, and permission settings from checkboxes. Attaches to msg for variable creation. |
Utility Nodes
| Node | Description |
|---|---|
| OPC UA Discovery | Starts a local OPC UA Discovery Server (LDS) on port 4840 and returns registered server URLs. |
Architecture
┌──────────────── Client Flow ────────────────────────┐
│ │
│ [inject] → [Item / Smart Item] → [Action] │
│ ↓ │
│ [Endpoint] ──→ [OPC UA Client] │
│ ↓ ↓ ↓ │
│ data status batch │
│ │
├──────────────── Server Flow ────────────────────────┤
│ │
│ [inject] → [Rights] → [Command] → [OPC UA Server] │
│ ↓ ↓ │
│ session status │
│ │
└─────────────────────────────────────────────────────┘
Todo
OPC UA Client
- [] Testing
- [] JSON Serilazation of outputs.
OPC UA Server
- [] Testing
OPC UA Item
- Works like intended
OPC UA Smart Item
- [] Automatic value type from browse
- multiple
OPC UA Endpoint
- Works like intended
OPC UA Event
- [] Testing
- [] Alignment with
.itemsdata structure
OPC UA Method
- [] Testing
- [] Alignment with
.itemsdata structure
OPC UA Discovery
- [] Testing
- may be removed depending on the demand of this function
General
- [] Unit and feautre testing
Installation
This project has yet to be packaged by npm so currently you can do:
cd ~/.node-red
npm install https://github.com/Claus-BR/BRDK-Node-RED-OPCUA
Then restart Node-RED and the nodes will appear under the BRDK OPCUA category in the palette.
