feat(infra): add second OPC UA server instance (opcua2) on port 50010

Enables multi-server testing with independent state. Both instances
share the same nodes.json tag config. Updated all infra documentation.

docs/test_infra/test_infra.md

@@ -1,12 +1,13 @@
 # Test Infrastructure
 
-This document describes the local Docker-based test infrastructure for ScadaLink development. Seven services provide the external dependencies needed to run and test the system locally. The first seven run in `infra/docker-compose.yml`; Traefik runs alongside the cluster nodes in `docker/docker-compose.yml`.
+This document describes the local Docker-based test infrastructure for ScadaLink development. Eight services provide the external dependencies needed to run and test the system locally. The first eight run in `infra/docker-compose.yml`; Traefik runs alongside the cluster nodes in `docker/docker-compose.yml`.
 
 ## Services
 
 | Service | Image | Port(s) | Config | Compose File |
 |---------|-------|---------|--------|-------------|
 | OPC UA Server | `mcr.microsoft.com/iotedge/opc-plc:latest` | 50000 (OPC UA), 8080 (web) | `infra/opcua/nodes.json` | `infra/` |
+| OPC UA Server 2 | `mcr.microsoft.com/iotedge/opc-plc:latest` | 50010 (OPC UA), 8081 (web) | `infra/opcua/nodes.json` | `infra/` |
 | LDAP Server | `glauth/glauth:latest` | 3893 | `infra/glauth/config.toml` | `infra/` |
 | MS SQL 2022 | `mcr.microsoft.com/mssql/server:2022-latest` | 1433 | `infra/mssql/setup.sql` | `infra/` |
 | SMTP (Mailpit) | `axllent/mailpit:latest` | 1025 (SMTP), 8025 (web) | Environment vars | `infra/` |
@@ -66,6 +67,9 @@ For use in `appsettings.Development.json`:
   "OpcUa": {
     "EndpointUrl": "opc.tcp://localhost:50000"
   },
+  "OpcUa2": {
+    "EndpointUrl": "opc.tcp://localhost:50010"
+  },
   "Smtp": {
     "Server": "localhost",
     "Port": 1025,
@@ -88,7 +92,7 @@ For use in `appsettings.Development.json`:
 ```bash
 cd infra
 docker compose down            # stop containers, preserve SQL data volume
-docker compose stop opcua      # stop a single service (also: ldap, mssql, smtp, restapi)
+docker compose stop opcua      # stop a single service (also: opcua2, ldap, mssql, smtp, restapi)
 ```
 
 **Full teardown** (removes volumes, optionally images and venv):

docs/test_infra/test_infra_opcua.md

@@ -6,9 +6,14 @@ The test OPC UA server uses [Azure IoT OPC PLC](https://github.com/Azure-Samples
 
 ## Image & Ports
 
+Two identical OPC UA server instances run with the same tag configuration, on different ports:
+
+| Instance | OPC UA Endpoint | Web UI | Container |
+|----------|----------------|--------|-----------|
+| opcua | `opc.tcp://localhost:50000` | `http://localhost:8080` | scadalink-opcua |
+| opcua2 | `opc.tcp://localhost:50010` | `http://localhost:8081` | scadalink-opcua2 |
+
 - **Image**: `mcr.microsoft.com/iotedge/opc-plc:latest`
-- **OPC UA endpoint**: `opc.tcp://localhost:50000`
-- **Web/config UI**: `http://localhost:8080`
 
 ## Startup Flags
 
@@ -43,20 +48,21 @@ The browse path from the Objects root is: `OpcPlc > ScadaLink > Motor|Pump|Tank|
 
 ## Verification
 
-1. Check the container is running:
+1. Check both containers are running:
 
 ```bash
 docker ps --filter name=scadalink-opcua
 ```
 
-2. Verify the OPC UA endpoint using any OPC UA client (e.g., UaExpert, opcua-commander):
+2. Verify both OPC UA endpoints using any OPC UA client (e.g., UaExpert, opcua-commander):
 
 ```bash
 # Using opcua-commander (npm install -g opcua-commander)
 opcua-commander -e opc.tcp://localhost:50000
+opcua-commander -e opc.tcp://localhost:50010
 ```
 
-3. Check the web UI at `http://localhost:8080` for server status and node listing.
+3. Check the web UIs at `http://localhost:8080` (opcua) and `http://localhost:8081` (opcua2) for server status and node listing.
 
 ## CLI Tool
 
@@ -89,7 +95,14 @@ python infra/tools/opcua_tool.py write --node "ns=3;s=Motor.Running" --value tru
 python infra/tools/opcua_tool.py monitor --nodes "ns=3;s=Motor.Speed,ns=3;s=Pump.FlowRate" --duration 15
 ```
 
-Use `--endpoint` to override the default endpoint (`opc.tcp://localhost:50000`). Run with `--help` for full usage.
+Use `--endpoint` to override the default endpoint (`opc.tcp://localhost:50000`). For the second instance:
+
+```bash
+python infra/tools/opcua_tool.py --endpoint opc.tcp://localhost:50010 check
+python infra/tools/opcua_tool.py --endpoint opc.tcp://localhost:50010 browse --path "3:OpcPlc.3:ScadaLink.3:Motor"
+```
+
+Run with `--help` for full usage.
 
 ## Relevance to ScadaLink Components
 

infra/README.md

@@ -8,11 +8,12 @@ Local Docker-based test services for ScadaLink development.
 docker compose up -d
 ```
 
-This starts five services:
+This starts the following services:
 
 | Service | Port | Purpose |
 |---------|------|---------|
 | OPC UA (Azure IoT OPC PLC) | 50000 (OPC UA), 8080 (web) | Simulated OPC UA server with ScadaLink-style tags |
+| OPC UA 2 (Azure IoT OPC PLC) | 50010 (OPC UA), 8081 (web) | Second OPC UA server instance (same tags, independent state) |
 | LDAP (GLAuth) | 3893 | Lightweight LDAP with test users/groups matching ScadaLink roles |
 | MS SQL 2022 | 1433 | Configuration and machine data databases |
 | SMTP (Mailpit) | 1025 (SMTP), 8025 (web) | Email capture for notification testing |
@@ -46,7 +47,7 @@ docker compose down
 
 **Stop a single service** (leave the others running):
 ```bash
-docker compose stop opcua      # or: ldap, mssql, smtp, restapi
+docker compose stop opcua      # or: opcua2, ldap, mssql, smtp, restapi
 docker compose start opcua     # bring it back without recreating
 ```
 

infra/docker-compose.yml

@@ -20,6 +20,27 @@ services:
       - scadalink-net
     restart: unless-stopped
 
+  opcua2:
+    image: mcr.microsoft.com/iotedge/opc-plc:latest
+    container_name: scadalink-opcua2
+    ports:
+      - "50010:50010"
+      - "8081:8080"
+    volumes:
+      - ./opcua/nodes.json:/app/config/nodes.json:ro
+    command: >
+      --autoaccept
+      --unsecuretransport
+      --sph
+      --sn=5 --sr=10 --st=uint
+      --fn=5 --fr=1 --ft=uint
+      --gn=5
+      --nf=/app/config/nodes.json
+      --pn=50010
+    networks:
+      - scadalink-net
+    restart: unless-stopped
+
   ldap:
     image: glauth/glauth:latest
     container_name: scadalink-ldap