OPC UA for .NET —
Your code. Your rules.

// Start the server and expose data
var temperatureNode = new OpcDataVariableNode<double>(
    name: "Temperature",
    value: 21.5
);

var server = new OpcServer(temperatureNode);
server.Start();

// Update values dynamically
while (true)
{
    temperatureNode.Value = ReadSensor();
    temperatureNode.ApplyChanges(server.SystemContext);
    Thread.Sleep(1000);
}

// Companion SDK: your machine as an ISA-95 JobManager
// NuGet: Opc.UaFx.Advanced.ISA95.JobControl

public class MyMachine() : OpcISA95JobManager(
    new OpcISA95JobOrderReceiver(),
    new OpcISA95JobResponseProvider())
{
    public override OpcISA95JobOrderMethodResults Start(
            OpcContext context,
            string jobOrderID,
            OpcText[] comment)
    {
        // Your logic: start the job, persist state, ...
        Console.WriteLine($"MES is starting job {jobOrderID}");
        return base.Start(context, jobOrderID, comment);
    }

    protected override OpcISA95JobResponse CreateJobResponse(
            OpcISA95JobOrder jobOrder,
            OpcISA95State[] jobStates)
    {
        return new OpcISA95JobResponse { JobOrderID = jobOrder.JobOrderID, JobState = jobStates };
    }
}