Connectivity Software User's Guide and Reference
Installed Examples - Sparkplug Library - SparkplugEdgeNodeDemoLibrary
// // Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-ConnectivityStudio/Latest/examples.html . // OPC client, server and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-ConnectivityStudio-CSharp . // Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own // a commercial license in order to use Online Forums, and we reply to every post. namespace SparkplugEdgeNodeDemoLibrary { static public class ConsoleMetrics { /// <summary> /// Adds metrics that allow interaction with the console. /// </summary> /// <remarks> /// <para> /// The Console metrics allow Sparkplug applications to display data on the Sparkplug edge node's console (if it has /// such device). They are included mainly for the fun of it, to demonstrate the fact that any actions can be tied /// to the Sparkplug commands. Real Sparkplug components will not do this.</para> /// </remarks> static public SparkplugMetric[] Create() => new[] { // The Write metric writes the value to the console. new SparkplugMetric("Write") .Readable(false) .WriteValueAction((string s) => Console.Write(s)), // The WriteLine metric writes the value to the console and appends a new line. new SparkplugMetric("WriteLine") .Readable(false) .WriteValueAction((string s) => Console.WriteLine(s)) }; } }
' ' Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-ConnectivityStudio/Latest/examples.html . ' OPC client, server and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-ConnectivityStudio-CSharp . ' Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own ' a commercial license in order to use Online Forums, and we reply to every post. Imports OpcLabs.EasySparkplug Namespace Global.SparkplugEdgeNodeDemoLibrary Public Module ConsoleMetrics ''' <summary> ''' Adds metrics that allow interaction with the console. ''' </summary> ''' <remarks> ''' <para> ''' The Console metrics allow Sparkplug applications to display data on the Sparkplug edge node's console (if it has ''' such device). They are included mainly for the fun of it, to demonstrate the fact that any actions can be tied ''' to the Sparkplug commands. Real Sparkplug components will not do this.</para> ''' </remarks> Public Function Create() As SparkplugMetric() Return { _ _ ' The Write metric writes the value to the console. New SparkplugMetric("Write") _ .Readable(False) _ .WriteValueAction(Sub(ByVal s As String) Console.Write(s)), _ _ ' The WriteLine metric writes the value to the console and appends a new line. New SparkplugMetric("WriteLine") _ .Readable(False) _ .WriteValueAction(Sub(ByVal s As String) Console.WriteLine(s)) } End Function End Module End Namespace
// // Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-ConnectivityStudio/Latest/examples.html . // OPC client, server and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-ConnectivityStudio-CSharp . // Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own // a commercial license in order to use Online Forums, and we reply to every post. namespace SparkplugEdgeNodeDemoLibrary { static public class DataMetrics { static public SparkplugMetric[] Create() { // Create read-only metrics of various data types, without adding them to the result first. We store // references to them individually, because we later implement write-only metrics that write to these // read-only metrics. var booleanReadOnlyMetric = new SparkplugMetric("ReadOnly/BooleanValue").Writable(false).ValueType<bool>(); var bytesReadOnlyMetric = new SparkplugMetric("ReadOnly/BytesValue").Writable(false).ValueType<byte[]>(); var dateTimeReadOnlyMetric = new SparkplugMetric("ReadOnly/DateTimeValue").Writable(false).ValueType<DateTime>(); var doubleReadOnlyMetric = new SparkplugMetric("ReadOnly/DoubleValue").Writable(false).ValueType<double>(); var floatReadOnlyMetric = new SparkplugMetric("ReadOnly/FloatValue").Writable(false).ValueType<float>(); var int16ReadOnlyMetric = new SparkplugMetric("ReadOnly/Int16Value").Writable(false).ValueType<short>(); var int32ReadOnlyMetric = new SparkplugMetric("ReadOnly/Int32Value").Writable(false).ValueType<int>(); var int64ReadOnlyMetric = new SparkplugMetric("ReadOnly/Int64Value").Writable(false).ValueType<long>(); var int8ReadOnlyMetric = new SparkplugMetric("ReadOnly/Int8Value").Writable(false).ValueType<sbyte>(); var stringReadOnlyMetric = new SparkplugMetric("ReadOnly/StringValue").Writable(false).ValueType<string>(); // Sparkplug Text and String data types are both represented as System.String in .NET. The data type must be // set explicitly for Text metrics, otherwise the default String data type is used. var textReadOnlyMetric = new SparkplugMetric("ReadOnly/TextValue").Writable(false).ValueType(SparkplugDataType.Text); var uInt16ReadOnlyMetric = new SparkplugMetric("ReadOnly/UInt16Value").Writable(false).ValueType<ushort>(); var uInt32ReadOnlyMetric = new SparkplugMetric("ReadOnly/UInt32Value").Writable(false).ValueType<uint>(); var uInt64ReadOnlyMetric = new SparkplugMetric("ReadOnly/UInt64Value").Writable(false).ValueType<ulong>(); var uInt8ReadOnlyMetric = new SparkplugMetric("ReadOnly/UInt8Value").Writable(false).ValueType<byte>(); var uuidReadOnlyMetric = new SparkplugMetric("ReadOnly/UuidValue").Writable(false).ValueType<Guid>(); return new[] { // Create Constant sub-folder. It contains read-only metrics with constant values. new SparkplugMetric("Constant/BooleanValue").ConstantValue(true), new SparkplugMetric("Constant/BytesValue").ConstantValue(new byte[] { 0x57, 0x21, 0x40, 0xfc }), new SparkplugMetric("Constant/DateTimeValue").ConstantValue( // We are passing in UTC times, because we want always the same result, and so we must specify // the DateTimeKind. You can pass in local times, but then they will be converted to UTC by the // producer, and the result will depend on the time zone. DateTime.SpecifyKind(new DateTime(2024, 7, 12, 14, 4, 55).AddSeconds(0.444), DateTimeKind.Utc)), new SparkplugMetric("Constant/DoubleValue").ConstantValue(7.75630105797e-011), new SparkplugMetric("Constant/FloatValue").ConstantValue(2.77002e+29f), new SparkplugMetric("Constant/Int16Value").ConstantValue((short)-30956), new SparkplugMetric("Constant/Int32Value").ConstantValue(276673160), new SparkplugMetric("Constant/Int64Value").ConstantValue(1412096336825367659), new SparkplugMetric("Constant/Int8Value").ConstantValue((sbyte)-113), new SparkplugMetric("Constant/StringValue").ConstantValue("lorem ipsum"), // Sparkplug Text and String data types are both represented as System.String in .NET. The data type must be // set explicitly for Text metrics, otherwise the default String data type is used. new SparkplugMetric("Constant/TextValue").ConstantValue(SparkplugDataType.Text, "lorem ipsum dolor sit"), new SparkplugMetric("Constant/UInt16Value").ConstantValue((ushort)64421), new SparkplugMetric("Constant/UInt32Value").ConstantValue(3853116537U), new SparkplugMetric("Constant/UInt64Value").ConstantValue(9431348106520835314UL), new SparkplugMetric("Constant/UInt8Value").ConstantValue((byte)144), new SparkplugMetric("Constant/UuidValue").ConstantValue( new Guid("{1AEF59AE-5029-42A7-9AE2-B2DC00072999}")), // Create Dynamic sub-folder. It contains metrics with dynamically changing values. new SparkplugMetric("Dynamic/BooleanValue").ReadValueFunction(NextRandomBoolean), new SparkplugMetric("Dynamic/BytesValue").ReadValueFunction(NextRandomBytes), new SparkplugMetric("Dynamic/DateTimeValue").ReadValueFunction(NextRandomDateTime), new SparkplugMetric("Dynamic/DoubleValue").ReadValueFunction(NextRandomDouble), new SparkplugMetric("Dynamic/FloatValue").ReadValueFunction(NextRandomFloat), new SparkplugMetric("Dynamic/Int16Value").ReadValueFunction(NextRandomInt16), new SparkplugMetric("Dynamic/Int32Value").ReadValueFunction(NextRandomInt32), new SparkplugMetric("Dynamic/Int64Value").ReadValueFunction(NextRandomInt64), new SparkplugMetric("Dynamic/Int8Value").ReadValueFunction(NextRandomInt8), new SparkplugMetric("Dynamic/StringValue").ReadValueFunction(NextRandomString), // Sparkplug Text and String data types are both represented as System.String in .NET. The data type must be // set explicitly for Text metrics, otherwise the default String data type is used. new SparkplugMetric("Dynamic/TextValue").ReadValueFunction(SparkplugDataType.Text, NextRandomText), new SparkplugMetric("Dynamic/UInt16Value").ReadValueFunction(NextRandomUInt16), new SparkplugMetric("Dynamic/UInt32Value").ReadValueFunction(NextRandomUInt32), new SparkplugMetric("Dynamic/UInt64Value").ReadValueFunction(NextRandomUInt64), new SparkplugMetric("Dynamic/UInt8Value").ReadValueFunction(NextRandomUInt8), new SparkplugMetric("Dynamic/UuidValue").ReadValueFunction(NextRandomUuid), new SparkplugMetric("Dynamic/BooleanArrayValue").ReadValueFunction(() => NextRandomArray(NextRandomBoolean)), new SparkplugMetric("Dynamic/DateTimeArrayValue").ReadValueFunction(() => NextRandomArray(NextRandomDateTime)), new SparkplugMetric("Dynamic/DoubleArrayValue").ReadValueFunction(() => NextRandomArray(NextRandomDouble)), new SparkplugMetric("Dynamic/FloatArrayValue").ReadValueFunction(() => NextRandomArray(NextRandomFloat)), new SparkplugMetric("Dynamic/Int16ArrayValue").ReadValueFunction(() => NextRandomArray(NextRandomInt16)), new SparkplugMetric("Dynamic/Int32ArrayValue").ReadValueFunction(() => NextRandomArray(NextRandomInt32)), new SparkplugMetric("Dynamic/Int64ArrayValue").ReadValueFunction(() => NextRandomArray(NextRandomInt64)), new SparkplugMetric("Dynamic/Int8ArrayValue").ReadValueFunction(() => NextRandomArray(NextRandomInt8)), new SparkplugMetric("Dynamic/StringArrayValue").ReadValueFunction(() => NextRandomArray(NextRandomString)), new SparkplugMetric("Dynamic/UInt16ArrayValue").ReadValueFunction(() => NextRandomArray(NextRandomUInt16)), new SparkplugMetric("Dynamic/UInt32ArrayValue").ReadValueFunction(() => NextRandomArray(NextRandomUInt32)), new SparkplugMetric("Dynamic/UInt64ArrayValue").ReadValueFunction(() => NextRandomArray(NextRandomUInt64)), // This is a tricky case. We want array of UInt8-s, but that is automatically recognized as scalar // Sparkplug Bytes. For a true array of Byte-s, the data type must be specified explicitly. new SparkplugMetric("Dynamic/UInt8ArrayValue").ReadValueFunction(SparkplugDataType.UInt8Array, () => NextRandomArray(NextRandomUInt8)), // The FullyWritable sub-folder contains metrics that have not only writable value, but also writable // timestamp. new SparkplugMetric("FullyWritable/BooleanValue").ReadWriteValue(true), new SparkplugMetric("FullyWritable/BytesValue").ReadWriteValue(new byte[] { 0x57, 0x21, 0x40, 0xfc }), new SparkplugMetric("FullyWritable/DateTimeValue").ReadWriteValue( // We are passing in UTC times, because we want always the same result, and so we must specify // the DateTimeKind. You can pass in local times, but then they will be converted to UTC by the // producer, and the result will depend on the time zone. DateTime.SpecifyKind(new DateTime(2024, 7, 12, 14, 4, 55).AddSeconds(0.444), DateTimeKind.Utc)), new SparkplugMetric("FullyWritable/DoubleValue").ReadWriteValue(7.75630105797e-011), new SparkplugMetric("FullyWritable/FloatValue").ReadWriteValue(2.77002e+29f), new SparkplugMetric("FullyWritable/Int16Value").ReadWriteValue((short)-30956), new SparkplugMetric("FullyWritable/Int32Value").ReadWriteValue(276673160), new SparkplugMetric("FullyWritable/Int64Value").ReadWriteValue(1412096336825367659), new SparkplugMetric("FullyWritable/Int8Value").ReadWriteValue((sbyte)-113), new SparkplugMetric("FullyWritable/StringValue").ReadWriteValue("lorem ipsum"), // Sparkplug Text and String data types are both represented as System.String in .NET. The data type must be // set explicitly for Text metrics, otherwise the default String data type is used. new SparkplugMetric("FullyWritable/TextValue").ReadWriteValue(SparkplugDataType.Text, "lorem ipsum dolor sit"), new SparkplugMetric("FullyWritable/UInt16Value").ReadWriteValue((ushort)64421), new SparkplugMetric("FullyWritable/UInt32Value").ReadWriteValue(3853116537U), new SparkplugMetric("FullyWritable/UInt64Value").ReadWriteValue(9431348106520835314UL), new SparkplugMetric("FullyWritable/UInt8Value").ReadWriteValue((byte)144), new SparkplugMetric("FullyWritable/UuidValue").ReadWriteValue( new Guid("{1AEF59AE-5029-42A7-9AE2-B2DC00072999}")), // The ReadOnly sub-folder contains metrics that are read-only, and their values can be changed through // corresponding data metrics in the WriteOnly sub-folder. booleanReadOnlyMetric, bytesReadOnlyMetric, dateTimeReadOnlyMetric, doubleReadOnlyMetric, floatReadOnlyMetric, int16ReadOnlyMetric, int32ReadOnlyMetric, int64ReadOnlyMetric, int8ReadOnlyMetric, stringReadOnlyMetric, textReadOnlyMetric, uInt16ReadOnlyMetric, uInt32ReadOnlyMetric, uInt64ReadOnlyMetric, uInt8ReadOnlyMetric, uuidReadOnlyMetric, // The Static sub-folder contains metrics with static values which can be changed through writing to // them (so-called "registers"). new SparkplugMetric("Static/BooleanValue").ReadWriteValue(true), new SparkplugMetric("Static/BytesValue").ReadWriteValue(new byte[] { 0x57, 0x21, 0x40, 0xfc }), new SparkplugMetric("Static/DateTimeValue").ReadWriteValue( // We are passing in UTC times, because we want always the same result, and so we must specify // the DateTimeKind. You can pass in local times, but then they will be converted to UTC by the // server, and the result will depend on the time zone. DateTime.SpecifyKind(new DateTime(2024, 7, 12, 14, 4, 55).AddSeconds(0.444), DateTimeKind.Utc)), new SparkplugMetric("Static/DoubleValue").ReadWriteValue(7.75630105797e-011), new SparkplugMetric("Static/FloatValue").ReadWriteValue(2.77002e+29f), new SparkplugMetric("Static/Int16Value").ReadWriteValue((short)-30956), new SparkplugMetric("Static/Int32Value").ReadWriteValue(276673160), new SparkplugMetric("Static/Int64Value").ReadWriteValue(1412096336825367659), new SparkplugMetric("Static/Int8Value").ReadWriteValue((sbyte)-113), new SparkplugMetric("Static/StringValue").ReadWriteValue("lorem ipsum"), // Sparkplug Text and String data types are both represented as System.String in .NET. The data type must be // set explicitly for Text metrics, otherwise the default String data type is used. new SparkplugMetric("Static/TextValue").ReadWriteValue(SparkplugDataType.Text, "lorem ipsum dolor sit"), new SparkplugMetric("Static/UInt16Value").ReadWriteValue((ushort)64421), new SparkplugMetric("Static/UInt32Value").ReadWriteValue(3853116537U), new SparkplugMetric("Static/UInt64Value").ReadWriteValue(9431348106520835314UL), new SparkplugMetric("Static/UInt8Value").ReadWriteValue((byte)144), new SparkplugMetric("Static/UuidValue").ReadWriteValue( new Guid("{1AEF59AE-5029-42A7-9AE2-B2DC00072999}")), new SparkplugMetric("Static/BooleanArrayValue").ReadWriteValue(new[] { true, false, true }), new SparkplugMetric("Static/DateTimeArrayValue").ReadWriteValue(new[] { // We are passing in UTC times, because we want always the same result, and so we must specify // the DateTimeKind. You can pass in local times, but then they will be converted to UTC by the // server, and the result will depend on the time zone. DateTime.SpecifyKind(new DateTime(2024, 7, 12, 14, 4, 55).AddSeconds(0.444), DateTimeKind.Utc), DateTime.SpecifyKind(new DateTime(2024, 4, 8), DateTimeKind.Utc), DateTime.SpecifyKind(new DateTime(2023, 8, 14, 18, 13, 0), DateTimeKind.Utc) }), new SparkplugMetric("Static/DoubleArrayValue").ReadWriteValue(new[] { 7.75630105797e-011, -0.467227097818268, -3.51653052582609E+300 }), new SparkplugMetric("Static/FloatArrayValue").ReadWriteValue(new[] { 2.77002e+29f, -1.103936E+36f, -9.002293E-28f }), new SparkplugMetric("Static/Int16ArrayValue").ReadWriteValue(new short[] { -30956, 31277, 21977 }), new SparkplugMetric("Static/Int32ArrayValue").ReadWriteValue(new[] { 276673160, 630080334, -391755284 }), new SparkplugMetric("Static/Int64ArrayValue").ReadWriteValue(new[] { 1412096336825367659, -808781653700434592, 4707848393174903135 }), new SparkplugMetric("Static/Int8ArrayValue").ReadWriteValue(new sbyte[] { -113, -92, 2 }), new SparkplugMetric("Static/StringArrayValue").ReadWriteValue(new[] { "lorem ipsum", "dolor sit amet", "consectetur adipiscing elit" }), new SparkplugMetric("Static/UInt16ArrayValue").ReadWriteValue(new ushort[] { 64421, 22663, 36755 }), new SparkplugMetric("Static/UInt32ArrayValue").ReadWriteValue(new uint[] { 3853116537, 968679231, 995611904 }), new SparkplugMetric("Static/UInt64ArrayValue").ReadWriteValue(new ulong[] { 9431348106520835314, 15635738044048254300, 946287779964705249 }), // This is a tricky case. We want array of UInt8-s, but that is automatically recognized as scalar // Sparkplug Bytes. For a true array of Byte-s, the data type must be specified explicitly. new SparkplugMetric("Static/UInt8ArrayValue").ReadWriteValue( dataType: SparkplugDataType.UInt8Array, value: new byte[] { 144, 19, 233 }), // Create and add write-only metrics of various data types. Implement write actions that write the value // to the corresponding read-only metric of the same data type. new SparkplugMetric("WriteOnly/BooleanValue").Readable(false).WriteValueAction((bool value) => booleanReadOnlyMetric.UpdateReadData(value)), new SparkplugMetric("WriteOnly/BytesValue").Readable(false).WriteValueAction((byte[] value) => bytesReadOnlyMetric.UpdateReadData(value)), new SparkplugMetric("WriteOnly/DateTimeValue").Readable(false).WriteValueAction((DateTime value) => dateTimeReadOnlyMetric.UpdateReadData(value)), new SparkplugMetric("WriteOnly/DoubleValue").Readable(false).WriteValueAction((double value) => doubleReadOnlyMetric.UpdateReadData(value)), new SparkplugMetric("WriteOnly/FloatValue").Readable(false).WriteValueAction((float value) => floatReadOnlyMetric.UpdateReadData(value)), new SparkplugMetric("WriteOnly/Int16Value").Readable(false).WriteValueAction((short value) => int16ReadOnlyMetric.UpdateReadData(value)), new SparkplugMetric("WriteOnly/Int32Value").Readable(false).WriteValueAction((int value) => int32ReadOnlyMetric.UpdateReadData(value)), new SparkplugMetric("WriteOnly/Int64Value").Readable(false).WriteValueAction((long value) => int64ReadOnlyMetric.UpdateReadData(value)), new SparkplugMetric("WriteOnly/Int8Value").Readable(false).WriteValueAction((sbyte value) => int8ReadOnlyMetric.UpdateReadData(value)), new SparkplugMetric("WriteOnly/StringValue").Readable(false).WriteValueAction((string value) => stringReadOnlyMetric.UpdateReadData(value)), new SparkplugMetric("WriteOnly/UInt16Value").Readable(false).WriteValueAction((ushort value) => uInt16ReadOnlyMetric.UpdateReadData(value)), new SparkplugMetric("WriteOnly/UInt32Value").Readable(false).WriteValueAction((uint value) => uInt32ReadOnlyMetric.UpdateReadData(value)), new SparkplugMetric("WriteOnly/UInt64Value").Readable(false).WriteValueAction((ulong value) => uInt64ReadOnlyMetric.UpdateReadData(value)), new SparkplugMetric("WriteOnly/UInt8Value").Readable(false).WriteValueAction((byte value) => uInt8ReadOnlyMetric.UpdateReadData(value)), new SparkplugMetric("WriteOnly/UuidValue").Readable(false).WriteValueAction((Guid value) => uuidReadOnlyMetric.UpdateReadData(value)) }; } // Random value generators. static private readonly Random Random = new Random(); static private readonly string[] RandomStrings = new[] { "lorem", "ipsum", "dolor", "sit", "amet" }; static private T[] NextRandomArray<T>(Func<T> nextRandomElement) => new[] { nextRandomElement(), nextRandomElement(), nextRandomElement() }; static private bool NextRandomBoolean() => Random.Next(2) != 0; static private byte[] NextRandomBytes() => new[] { NextRandomUInt8(), NextRandomUInt8(), NextRandomUInt8(), NextRandomUInt8() }; static private DateTime NextRandomDateTime() => DateTime.MinValue.AddMilliseconds((DateTime.MaxValue - new DateTime(1700, 1, 1)).TotalMilliseconds * Random.NextDouble()); static private float NextRandomFloat() => (float)Math.Pow(10, Math.Log10(float.MaxValue) * Random.NextDouble()) * (2 * Random.Next(2) - 1); static private double NextRandomDouble() => Math.Pow(10, Math.Log10(double.MaxValue) * Random.NextDouble()) * (2 * Random.Next(2) - 1); static private short NextRandomInt16() => (short)Random.Next(short.MinValue, short.MaxValue + 1); static private int NextRandomInt32() { byte[] buffer = new byte[4]; Random.NextBytes(buffer); return BitConverter.ToInt32(buffer, 0); } static private long NextRandomInt64() { byte[] buffer = new byte[8]; Random.NextBytes(buffer); return BitConverter.ToInt64(buffer, 0); } static private sbyte NextRandomInt8() => (sbyte)Random.Next(sbyte.MinValue, sbyte.MaxValue + 1); static private string NextRandomString() => RandomStrings[Random.Next(RandomStrings.Length)]; static private string NextRandomText() => NextRandomString() + " " + NextRandomString(); static private ushort NextRandomUInt16() => (ushort)Random.Next(ushort.MinValue, ushort.MaxValue + 1); static private uint NextRandomUInt32() { byte[] buffer = new byte[4]; Random.NextBytes(buffer); return BitConverter.ToUInt32(buffer, 0); } static private ulong NextRandomUInt64() { byte[] buffer = new byte[8]; Random.NextBytes(buffer); return BitConverter.ToUInt64(buffer, 0); } static private byte NextRandomUInt8() => (byte)Random.Next(byte.MinValue, byte.MaxValue + 1); static private Guid NextRandomUuid() => Guid.NewGuid(); } }
' ' Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-ConnectivityStudio/Latest/examples.html . ' OPC client, server and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-ConnectivityStudio-CSharp . ' Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own ' a commercial license in order to use Online Forums, and we reply to every post. Imports OpcLabs.EasySparkplug Namespace Global.SparkplugEdgeNodeDemoLibrary Public Module DataMetrics Public Function Create() As SparkplugMetric() ' Create read-only metrics of various data types, without adding them to the result first. We store ' references to them individually, because we later implement write-only metrics that write to these ' read-only metrics. Dim booleanReadOnlyMetric = New SparkplugMetric("ReadOnly/BooleanValue").Writable(False).ValueType(Of Boolean)() Dim bytesReadOnlyMetric = New SparkplugMetric("ReadOnly/BytesValue").Writable(False).ValueType(Of Byte())() Dim dateTimeReadOnlyMetric = New SparkplugMetric("ReadOnly/DateTimeValue").Writable(False).ValueType(Of DateTime)() Dim doubleReadOnlyMetric = New SparkplugMetric("ReadOnly/DoubleValue").Writable(False).ValueType(Of Double)() Dim floatReadOnlyMetric = New SparkplugMetric("ReadOnly/FloatValue").Writable(False).ValueType(Of Single)() Dim int16ReadOnlyMetric = New SparkplugMetric("ReadOnly/Int16Value").Writable(False).ValueType(Of Short)() Dim int32ReadOnlyMetric = New SparkplugMetric("ReadOnly/Int32Value").Writable(False).ValueType(Of Integer)() Dim int64ReadOnlyMetric = New SparkplugMetric("ReadOnly/Int64Value").Writable(False).ValueType(Of Long)() Dim int8ReadOnlyMetric = New SparkplugMetric("ReadOnly/Int8Value").Writable(False).ValueType(Of SByte)() Dim stringReadOnlyMetric = New SparkplugMetric("ReadOnly/StringValue").Writable(False).ValueType(Of String)() ' Sparkplug Text and String data types are both represented as System.String in .NET. The data type must be ' set explicitly for Text metrics, otherwise the default String data type is used. Dim textReadOnlyMetric = New SparkplugMetric("ReadOnly/TextValue").Writable(False).ValueType(SparkplugDataType.Text) Dim uInt16ReadOnlyMetric = New SparkplugMetric("ReadOnly/UInt16Value").Writable(False).ValueType(Of UShort)() Dim uInt32ReadOnlyMetric = New SparkplugMetric("ReadOnly/UInt32Value").Writable(False).ValueType(Of UInteger)() Dim uInt64ReadOnlyMetric = New SparkplugMetric("ReadOnly/UInt64Value").Writable(False).ValueType(Of ULong)() Dim uInt8ReadOnlyMetric = New SparkplugMetric("ReadOnly/UInt8Value").Writable(False).ValueType(Of Byte)() Dim uuidReadOnlyMetric = New SparkplugMetric("ReadOnly/UuidValue").Writable(False).ValueType(Of Guid)() Return { _ _ ' Create Constant sub-folder. It contains read-only metrics with constant values. New SparkplugMetric("Constant/BooleanValue").ConstantValue(True), New SparkplugMetric("Constant/BytesValue").ConstantValue(New Byte() {&H57, &H21, &H40, &HFC}), New SparkplugMetric("Constant/DateTimeValue").ConstantValue _ ( _ _ ' We are passing In UTC times, because we want always the same result, And so we must specify _ ' the DateTimeKind. You can pass in local times, but then they will be converted to UTC by the _ ' producer, And the result will depend on the time zone. DateTime.SpecifyKind(New DateTime(2024, 7, 12, 14, 4, 55).AddSeconds(0.444), DateTimeKind.Utc)), New SparkplugMetric("Constant/DoubleValue").ConstantValue(0.0000000000775630105797), New SparkplugMetric("Constant/FloatValue").ConstantValue(2.77002E+29F), New SparkplugMetric("Constant/Int16Value").ConstantValue(CShort(30956)), New SparkplugMetric("Constant/Int32Value").ConstantValue(276673160), New SparkplugMetric("Constant/Int64Value").ConstantValue(1412096336825367659), New SparkplugMetric("Constant/Int8Value").ConstantValue(CSByte(-113)), New SparkplugMetric("Constant/StringValue").ConstantValue("lorem ipsum") _ , _ ' Sparkplug Text and String data types are both represented as System.String in .NET. The data type must be _ ' for Text metrics, otherwise the default String data type is used. New SparkplugMetric("Constant/TextValue").ConstantValue(SparkplugDataType.Text, "lorem ipsum dolor sit"), New SparkplugMetric("Constant/UInt16Value").ConstantValue(CUShort(64421)), New SparkplugMetric("Constant/UInt32Value").ConstantValue(3853116537UI), New SparkplugMetric("Constant/UInt64Value").ConstantValue(9431348106520835314UL), New SparkplugMetric("Constant/UInt8Value").ConstantValue(CByte(144)), New SparkplugMetric("Constant/UuidValue").ConstantValue( New Guid("{1AEF59AE-5029-42A7-9AE2-B2DC00072999}")) _ , _ _ ' Create Dynamic sub-folder. It contains metrics with dynamically changing values. New SparkplugMetric("Dynamic/BooleanValue").ReadValueFunction(Function() NextRandomBoolean()), New SparkplugMetric("Dynamic/BytesValue").ReadValueFunction(Function() NextRandomBytes()), New SparkplugMetric("Dynamic/DateTimeValue").ReadValueFunction(Function() NextRandomDateTime()), New SparkplugMetric("Dynamic/DoubleValue").ReadValueFunction(Function() NextRandomDouble()), New SparkplugMetric("Dynamic/FloatValue").ReadValueFunction(Function() NextRandomFloat()), New SparkplugMetric("Dynamic/Int16Value").ReadValueFunction(Function() NextRandomInt16()), New SparkplugMetric("Dynamic/Int32Value").ReadValueFunction(Function() NextRandomInt32()), New SparkplugMetric("Dynamic/Int64Value").ReadValueFunction(Function() NextRandomInt64()), New SparkplugMetric("Dynamic/Int8Value").ReadValueFunction(Function() NextRandomInt8()), New SparkplugMetric("Dynamic/StringValue").ReadValueFunction(Function() NextRandomString()) _ , _ ' Sparkplug Text and String data types are both represented as System.String in .NET. The data type must be _ ' for Text metrics, otherwise the default String data type is used. New SparkplugMetric("Dynamic/TextValue").ReadValueFunction(SparkplugDataType.Text, Function() NextRandomText()), New SparkplugMetric("Dynamic/UInt16Value").ReadValueFunction(Function() NextRandomUInt16()), New SparkplugMetric("Dynamic/UInt32Value").ReadValueFunction(Function() NextRandomUInt32()), New SparkplugMetric("Dynamic/UInt64Value").ReadValueFunction(Function() NextRandomUInt64()), New SparkplugMetric("Dynamic/UInt8Value").ReadValueFunction(Function() NextRandomUInt8()), New SparkplugMetric("Dynamic/UuidValue").ReadValueFunction(Function() NextRandomUuid()), _ New SparkplugMetric("Dynamic/BooleanArrayValue").ReadValueFunction( Function() NextRandomArray(Function() NextRandomBoolean())), New SparkplugMetric("Dynamic/DateTimeArrayValue").ReadValueFunction( Function() NextRandomArray(Function() NextRandomDateTime())), New SparkplugMetric("Dynamic/DoubleArrayValue").ReadValueFunction( Function() NextRandomArray(Function() NextRandomDouble())), New SparkplugMetric("Dynamic/FloatArrayValue").ReadValueFunction( Function() NextRandomArray(Function() NextRandomFloat())), New SparkplugMetric("Dynamic/Int16ArrayValue").ReadValueFunction( Function() NextRandomArray(Function() NextRandomInt16())), New SparkplugMetric("Dynamic/Int32ArrayValue").ReadValueFunction( Function() NextRandomArray(Function() NextRandomInt32())), New SparkplugMetric("Dynamic/Int64ArrayValue").ReadValueFunction( Function() NextRandomArray(Function() NextRandomInt64())), New SparkplugMetric("Dynamic/Int8ArrayValue").ReadValueFunction( Function() NextRandomArray(Function() NextRandomInt8())), New SparkplugMetric("Dynamic/StringArrayValue").ReadValueFunction( Function() NextRandomArray(Function() NextRandomString())), New SparkplugMetric("Dynamic/UInt16ArrayValue").ReadValueFunction( Function() NextRandomArray(Function() NextRandomUInt16())), New SparkplugMetric("Dynamic/UInt32ArrayValue").ReadValueFunction( Function() NextRandomArray(Function() NextRandomUInt32())), New SparkplugMetric("Dynamic/UInt64ArrayValue").ReadValueFunction( Function() NextRandomArray(Function() NextRandomUInt64())) _ , _ ' Sparkplug Text and String data types are both represented as System.String in .NET. The data type must be _ ' Sparkplug Text and String data types are both represented as System.String in .NET. The data type must be New SparkplugMetric("Dynamic/UInt8ArrayValue").ReadValueFunction(SparkplugDataType.UInt8Array, Function() NextRandomArray(Function() NextRandomUInt8())) _ , _ _ ' The FullyWritable sub-folder contains metrics that have not only writable value, but also writable _ ' timestamp. New SparkplugMetric("FullyWritable/BooleanValue").ReadWriteValue(True), New SparkplugMetric("FullyWritable/BytesValue").ReadWriteValue(New Byte() {&H57, &H21, &H40, &HFC}), New SparkplugMetric("FullyWritable/DateTimeValue").ReadWriteValue _ ( _ _ ' We are passing in UTC times, because we want always the same result, and so we must specify _ ' the DateTimeKind. You can pass in local times, but then they will be converted to UTC by the _ ' producer, and the result will depend on the time zone. DateTime.SpecifyKind(New DateTime(2024, 7, 12, 14, 4, 55).AddSeconds(0.444), DateTimeKind.Utc)), New SparkplugMetric("FullyWritable/DoubleValue").ReadWriteValue(0.0000000000775630105797), New SparkplugMetric("FullyWritable/FloatValue").ReadWriteValue(2.77002E+29F), New SparkplugMetric("FullyWritable/Int16Value").ReadWriteValue(CShort(-30956)), New SparkplugMetric("FullyWritable/Int32Value").ReadWriteValue(276673160), New SparkplugMetric("FullyWritable/Int64Value").ReadWriteValue(1412096336825367659), New SparkplugMetric("FullyWritable/Int8Value").ReadWriteValue(CSByte(-113)), New SparkplugMetric("FullyWritable/StringValue").ReadWriteValue("lorem ipsum") _ , _ ' Sparkplug Text and String data types are both represented as System.String in .NET. The data type must be _ ' for Text metrics, otherwise the default String data type is used. New SparkplugMetric("FullyWritable/TextValue").ReadWriteValue(SparkplugDataType.Text, "lorem ipsum dolor sit"), New SparkplugMetric("FullyWritable/UInt16Value").ReadWriteValue(CUShort(64421)), New SparkplugMetric("FullyWritable/UInt32Value").ReadWriteValue(3853116537UI), New SparkplugMetric("FullyWritable/UInt64Value").ReadWriteValue(9431348106520835314UL), New SparkplugMetric("FullyWritable/UInt8Value").ReadWriteValue(CByte(144)), New SparkplugMetric("FullyWritable/UuidValue").ReadWriteValue( New Guid("{1AEF59AE-5029-42A7-9AE2-B2DC00072999}")) _ , _ _ ' The ReadOnly sub-folder contains metrics that are read-only, and their values can be changed through _ ' corresponding data metrics in the WriteOnly sub-folder. booleanReadOnlyMetric, bytesReadOnlyMetric, dateTimeReadOnlyMetric, doubleReadOnlyMetric, floatReadOnlyMetric, int16ReadOnlyMetric, int32ReadOnlyMetric, int64ReadOnlyMetric, int8ReadOnlyMetric, stringReadOnlyMetric, textReadOnlyMetric, uInt16ReadOnlyMetric, uInt32ReadOnlyMetric, uInt64ReadOnlyMetric, uInt8ReadOnlyMetric, uuidReadOnlyMetric _ , _ _ ' The Static sub-folder contains metrics with static values which can be changed through writing to _ ' them (so-called "registers"). New SparkplugMetric("Static/BooleanValue").ReadWriteValue(True), New SparkplugMetric("Static/BytesValue").ReadWriteValue(New Byte() {&H57, &H21, &H40, &HFC}), New SparkplugMetric("Static/DateTimeValue").ReadWriteValue _ ( _ ' We are passing in UTC times, because we want always the same result, and so we must specify _ ' the DateTimeKind. You can pass in local times, but then they will be converted to UTC by the _ ' server, and the result will depend on the time zone. DateTime.SpecifyKind(New DateTime(2024, 7, 12, 14, 4, 55).AddSeconds(0.444), DateTimeKind.Utc)), New SparkplugMetric("Static/DoubleValue").ReadWriteValue(0.0000000000775630105797), New SparkplugMetric("Static/FloatValue").ReadWriteValue(2.77002E+29F), New SparkplugMetric("Static/Int16Value").ReadWriteValue(CShort(-30956)), New SparkplugMetric("Static/Int32Value").ReadWriteValue(276673160), New SparkplugMetric("Static/Int64Value").ReadWriteValue(1412096336825367659), New SparkplugMetric("Static/Int8Value").ReadWriteValue(CSByte(-113)), New SparkplugMetric("Static/StringValue").ReadWriteValue("lorem ipsum") _ , _ ' Sparkplug Text and String data types are both represented as System.String in .NET. The data type must be _ ' for Text metrics, otherwise the default String data type is used. New SparkplugMetric("Static/TextValue").ReadWriteValue(SparkplugDataType.Text, "lorem ipsum dolor sit"), New SparkplugMetric("Static/UInt16Value").ReadWriteValue(CUShort(64421)), New SparkplugMetric("Static/UInt32Value").ReadWriteValue(3853116537UI), New SparkplugMetric("Static/UInt64Value").ReadWriteValue(9431348106520835314UL), New SparkplugMetric("Static/UInt8Value").ReadWriteValue(CByte(144)), New SparkplugMetric("Static/UuidValue").ReadWriteValue( New Guid("{1AEF59AE-5029-42A7-9AE2-B2DC00072999}")), _ _ New SparkplugMetric("Static/BooleanArrayValue").ReadWriteValue( { True, False, True }), New SparkplugMetric("Static/DateTimeArrayValue").ReadWriteValue( { _ _ ' We are passing in UTC times, because we want always the same result, and so we must specify _ ' the DateTimeKind. You can pass in local times, but then they will be converted to UTC by the _ ' server, and the result will depend on the time zone. DateTime.SpecifyKind(New DateTime(2024, 7, 12, 14, 4, 55).AddSeconds(0.444), DateTimeKind.Utc), DateTime.SpecifyKind(New DateTime(2024, 4, 8), DateTimeKind.Utc), DateTime.SpecifyKind(New DateTime(2023, 8, 14, 18, 13, 0), DateTimeKind.Utc) }), New SparkplugMetric("Static/DoubleArrayValue").ReadWriteValue( { 0.0000000000775630105797, -0.467227097818268, -3.51653052582609E+300 }), New SparkplugMetric("Static/FloatArrayValue").ReadWriteValue( { 2.77002E+29F, -1.103936E+36F, -9.002293E-28F }), New SparkplugMetric("Static/Int16ArrayValue").ReadWriteValue(New Short() _ { -30956, 31277, 21977 }), New SparkplugMetric("Static/Int32ArrayValue").ReadWriteValue( { 276673160, 630080334, -391755284 }), New SparkplugMetric("Static/Int64ArrayValue").ReadWriteValue( { 1412096336825367659, -808781653700434592, 4707848393174903135 }), New SparkplugMetric("Static/Int8ArrayValue").ReadWriteValue(New SByte() _ { -113, -92, 2 }), New SparkplugMetric("Static/StringArrayValue").ReadWriteValue( { "lorem ipsum", "dolor sit amet", "consectetur adipiscing elit" }), New SparkplugMetric("Static/UInt16ArrayValue").ReadWriteValue(New UShort() _ { 64421, 22663, 36755 }), New SparkplugMetric("Static/UInt32ArrayValue").ReadWriteValue(New UInteger() _ { 3853116537, 968679231, 995611904 }), New SparkplugMetric("Static/UInt64ArrayValue").ReadWriteValue(New ULong() _ { 9431348106520835314UL, 15635738044048254300UL, 946287779964705249 }), _ _ ' This is a tricky case. We want array of UInt8-s, but that is automatically recognized as scalar _ ' Sparkplug Bytes. For a true array of Byte-s, the data type must be specified explicitly. New SparkplugMetric("Static/UInt8ArrayValue").ReadWriteValue( dataType:=SparkplugDataType.UInt8Array, value:=New Byte() _ { 144, 19, 233 }), _ _ _ ' Create and add write-only metrics of various data types. Implement write actions that write the value _ ' to the corresponding read-only metric of the same data type. New SparkplugMetric("WriteOnly/BooleanValue").Readable(False).WriteValueAction( Sub(ByVal value As Boolean) booleanReadOnlyMetric.UpdateReadData(value)), New SparkplugMetric("WriteOnly/BytesValue").Readable(False).WriteValueAction( Sub(ByVal value As Byte()) bytesReadOnlyMetric.UpdateReadData(value)), New SparkplugMetric("WriteOnly/DateTimeValue").Readable(False).WriteValueAction( Sub(ByVal value As DateTime) dateTimeReadOnlyMetric.UpdateReadData(value)), New SparkplugMetric("WriteOnly/DoubleValue").Readable(False).WriteValueAction( Sub(ByVal value As Double) doubleReadOnlyMetric.UpdateReadData(value)), New SparkplugMetric("WriteOnly/FloatValue").Readable(False).WriteValueAction( Sub(ByVal value As Single) floatReadOnlyMetric.UpdateReadData(value)), New SparkplugMetric("WriteOnly/Int16Value").Readable(False).WriteValueAction( Sub(ByVal value As Short) int16ReadOnlyMetric.UpdateReadData(value)), New SparkplugMetric("WriteOnly/Int32Value").Readable(False).WriteValueAction( Sub(ByVal value As Integer()) int32ReadOnlyMetric.UpdateReadData(value)), New SparkplugMetric("WriteOnly/Int64Value").Readable(False).WriteValueAction( Sub(ByVal value As Long) int64ReadOnlyMetric.UpdateReadData(value)), New SparkplugMetric("WriteOnly/Int8Value").Readable(False).WriteValueAction( Sub(ByVal value As SByte) int8ReadOnlyMetric.UpdateReadData(value)), New SparkplugMetric("WriteOnly/StringValue").Readable(False).WriteValueAction( Sub(ByVal value As String) stringReadOnlyMetric.UpdateReadData(value)), New SparkplugMetric("WriteOnly/UInt16Value").Readable(False).WriteValueAction( Sub(ByVal value As UShort) uInt16ReadOnlyMetric.UpdateReadData(value)), New SparkplugMetric("WriteOnly/UInt32Value").Readable(False).WriteValueAction( Sub(ByVal value As UInteger) uInt32ReadOnlyMetric.UpdateReadData(value)), New SparkplugMetric("WriteOnly/UInt64Value").Readable(False).WriteValueAction( Sub(ByVal value As ULong) uInt64ReadOnlyMetric.UpdateReadData(value)), New SparkplugMetric("WriteOnly/UInt8Value").Readable(False).WriteValueAction( Sub(ByVal value As Byte) uInt8ReadOnlyMetric.UpdateReadData(value)), New SparkplugMetric("WriteOnly/UuidValue").Readable(False).WriteValueAction( Sub(ByVal value As Guid) uuidReadOnlyMetric.UpdateReadData(value)) } End Function ' Random value generators. Private ReadOnly Random As Random = New Random() Private ReadOnly RandomStrings As String() = {"lorem", "ipsum", "dolor", "sit", "amet"} Private Function NextRandomArray(Of T)(ByVal [nextRandomElement] As Func(Of T)) As T() Return {nextRandomElement(), nextRandomElement(), nextRandomElement()} End Function Private Function NextRandomBoolean() As Boolean Return Random.Next(2) <> 0 End Function Private Function NextRandomBytes() As Byte() Return {NextRandomUInt8(), NextRandomUInt8(), NextRandomUInt8(), NextRandomUInt8()} End Function Private Function NextRandomDateTime() As DateTime Return DateTime.MinValue.AddMilliseconds((DateTime.MaxValue - New DateTime(1700, 1, 1)).TotalMilliseconds * Random.NextDouble()) End Function Private Function NextRandomFloat() As Single Return CSng(Math.Pow(10, Math.Log10(Single.MaxValue) * Random.NextDouble())) * (2 * Random.Next(2) - 1) End Function Private Function NextRandomDouble() As Double Return Math.Pow(10, Math.Log10(Double.MaxValue) * Random.NextDouble()) * (2 * Random.Next(2) - 1) End Function Private Function NextRandomInt16() As Short Return CShort(Random.Next(Short.MinValue, Short.MaxValue + 1)) End Function Private Function NextRandomInt32() As Integer Dim buffer As Byte() = New Byte(3) {} Random.NextBytes(buffer) Return BitConverter.ToInt32(buffer, 0) End Function Private Function NextRandomInt64() As Long Dim buffer As Byte() = New Byte(7) {} Random.NextBytes(buffer) Return BitConverter.ToInt64(buffer, 0) End Function Private Function NextRandomInt8() As SByte Return CSByte(Random.Next(SByte.MinValue, SByte.MaxValue + 1)) End Function Private Function NextRandomString() As String Return RandomStrings(Random.Next(RandomStrings.Length)) End Function Private Function NextRandomText() As String Return NextRandomString() + " " + NextRandomString() End Function Private Function NextRandomUInt16() As UShort Return CUShort(Random.Next(UShort.MinValue, UShort.MaxValue + 1)) End Function Private Function NextRandomUInt32() As UInteger Dim buffer As Byte() = New Byte(3) {} Random.NextBytes(buffer) Return BitConverter.ToUInt32(buffer, 0) End Function Private Function NextRandomUInt64() As ULong Dim buffer = New Byte(7) {} Random.NextBytes(buffer) Return BitConverter.ToUInt64(buffer, 0) End Function Private Function NextRandomUInt8() As Byte Return Convert.ToByte(Random.Next(Byte.MinValue, Byte.MaxValue + 1)) End Function Private Function NextRandomUuid() As Guid Return Guid.NewGuid() End Function End Module End Namespace
// // Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-ConnectivityStudio/Latest/examples.html . // OPC client, server and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-ConnectivityStudio-CSharp . // Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own // a commercial license in order to use Online Forums, and we reply to every post. namespace SparkplugEdgeNodeDemoLibrary { static public class DemoMetrics { /// <summary> /// Adds metrics that demonstrate various features of EasySparkplug. /// </summary> static public SparkplugMetric[] Create() => new[] { // Demonstrate that in the simplest case, metrics can be added directly to the root level. new SparkplugMetric("Ramp").ReadValueFunction(() => (Environment.TickCount % 1000)/1000.0), new SparkplugMetric("Simple").ReadWriteValue(0), new SparkplugMetric("Simple2").ReadWriteValue(0), // Demonstrate the fact that metrics can be organized in folders, and that metrics can be nested. new SparkplugMetric("Random").ReadValueFunction(() => Random.NextDouble()), new SparkplugMetric("Nested/Random").ReadValueFunction(() => Random.NextDouble()), new SparkplugMetric("Nested/FurtherNested/Random").ReadValueFunction(() => Random.NextDouble()), // Demonstrate that the metric may decide to fail the write operation. // Note that the consumer can only determine that the write operation failed by subscribing to the metric and // observing whether the value has changed after the write operation new SparkplugMetric("WriteFailure").WriteFunction<int>(_ => false) }; static private readonly Random Random = new Random(); } }
' ' Find all latest examples here: https://opclabs.doc-that.com/files/onlinedocs/OPCLabs-ConnectivityStudio/Latest/examples.html . ' OPC client, server and subscriber examples in C# on GitHub: https://github.com/OPCLabs/Examples-ConnectivityStudio-CSharp . ' Missing some example? Ask us for it on our Online Forums, https://www.opclabs.com/forum/index ! You do not have to own ' a commercial license in order to use Online Forums, and we reply to every post. Imports OpcLabs.EasySparkplug Namespace Global.SparkplugEdgeNodeDemoLibrary Public Module DemoMetrics ''' <summary> ''' Adds metrics that demonstrate various features of EasySparkplug. ''' </summary> Public Function Create() As SparkplugMetric() Return { _ _ ' Demonstrate that in the simplest case, metrics can be added directly to the root level. New SparkplugMetric("Ramp").ReadValueFunction(Function() (Environment.TickCount Mod 1000) / 1000.0), New SparkplugMetric("Simple").ReadWriteValue(0), New SparkplugMetric("Simple2").ReadWriteValue(0) _ , _ _ ' Demonstrate the fact that metrics can be organized in folders, and that metrics can be nested. New SparkplugMetric("Random").ReadValueFunction(Function() Random.NextDouble()), New SparkplugMetric("Nested/Random").ReadValueFunction(Function() Random.NextDouble()), New SparkplugMetric("Nested/FurtherNested/Random").ReadValueFunction(Function() Random.NextDouble()) _ , _ _ ' Demonstrate that the metric may decide to fail the write operation. _ ' Note that the consumer can only determine that the write operation failed by subscribing to the metric and _ ' observing whether the value has changed after the write operation New SparkplugMetric("WriteFailure").WriteFunction(Of Integer)(Function(__) False) } End Function Private ReadOnly Random As Random = New Random() End Module End Namespace
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