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Gateway Driver Components

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Gateway Driver Components

This note records the driver component choices for the expanded southbound gateway surface.

Target Component choice Status in this repo Runtime boundary Notes
OPC UA OPC Foundation UA .NET Standard (OPCFoundation.NetStandard.Opc.Ua.Client and OPCFoundation.NetStandard.Opc.Ua.Configuration) Implemented as opc-ua Cross-platform .NET 8 Supports scalar node read/write and batch read/write through the unified driver contract. Addresses are OPC UA NodeIds such as ns=2;s=Device.Temperature.
OPC DA Optional Windows adapter, candidate TitaniumAS.Opc.Client Registered as guarded opc-da placeholder Windows COM/DCOM only Keep out of the cross-platform gateway package unless we split a Windows-only adapter. A safer deployment path is bridging OPC DA to OPC UA.
MT CNC MTConnect HTTP/XML current endpoint Implemented as mt-cnc Cross-platform HTTP Treats "MT CNC" as MTConnect. Reads data items from /current; writes are rejected because MTConnect current is read-only.
Fanuc CNC Fanuc FOCAS (fwlib32/fwlib64) native SDK boundary Registered as guarded fanuc-cnc placeholder Native vendor runtime Requires Fanuc FOCAS licensing/runtime, bitness handling, and machine validation. It should live in an optional adapter assembly.

Connection Shapes

opc-ua:

  • endpoint: opc.tcp://host:4840
  • useSecurity: true or false
  • securityMode: Auto, None, Sign, SignAndEncrypt
  • securityPolicy: Auto, None, Basic256Sha256, Aes128_Sha256_RsaOaep, Aes256_Sha256_RsaPss
  • username / password: optional user identity
  • timeout, sessionTimeout, autoAcceptUntrustedCertificates

mt-cnc:

  • baseUrl: MTConnect agent base URL
  • device: optional device path segment
  • path: defaults to current
  • timeout: HTTP timeout in milliseconds

opc-da and fanuc-cnc are intentionally explicit placeholders. Their metadata is visible in the driver catalog so the platform can model them, but runtime access returns a clear error until a Windows/native adapter is added.

BASIC Runtime AOT Split

The BASIC runtime follows the same split:

  • core language, parser, evaluator, BCL-backed helpers, and MQTT/serial/Modbus/PLC helpers stay in IoTEdge.BasicRuntime
  • gateway-specific bridges such as driver read/write, transform apply, and upload live in IoTEdge.RuntimeExtensions
  • build.ps1 -MustAot or -p:EdgeAot=true disables the gateway bridge project so it is not referenced or injected