58 lines
2.1 KiB
C#
58 lines
2.1 KiB
C#
using CliFx;
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using CliFx.Attributes;
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using CliFx.Infrastructure;
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using Opc.Ua;
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using Opc.Ua.Client;
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namespace OpcUaCli.Commands;
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[Command("write", Description = "Write a value to a node")]
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public class WriteCommand : ICommand
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{
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/// <summary>
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/// Gets the OPC UA endpoint URL to connect to before issuing the write.
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/// </summary>
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[CommandOption("url", 'u', Description = "OPC UA server endpoint URL", IsRequired = true)]
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public string Url { get; init; } = default!;
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/// <summary>
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/// Gets the node identifier that should receive the write.
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/// </summary>
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[CommandOption("node", 'n', Description = "Node ID (e.g. ns=2;s=MyNode)", IsRequired = true)]
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public string NodeId { get; init; } = default!;
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/// <summary>
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/// Gets the textual value supplied on the command line before type conversion.
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/// </summary>
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[CommandOption("value", 'v', Description = "Value to write", IsRequired = true)]
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public string Value { get; init; } = default!;
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/// <summary>
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/// Connects to the OPC UA endpoint, converts the supplied value, and writes it to the target node.
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/// </summary>
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/// <param name="console">The console used to report the write result.</param>
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public async ValueTask ExecuteAsync(IConsole console)
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{
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using var session = await OpcUaHelper.ConnectAsync(Url);
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var node = new NodeId(NodeId);
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var current = await session.ReadValueAsync(node);
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var typedValue = OpcUaHelper.ConvertValue(Value, current.Value);
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var writeValue = new WriteValue
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{
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NodeId = node,
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AttributeId = Attributes.Value,
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Value = new DataValue(new Variant(typedValue))
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};
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var request = new WriteValueCollection { writeValue };
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var response = await session.WriteAsync(null, request, CancellationToken.None);
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if (StatusCode.IsGood(response.Results[0]))
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await console.Output.WriteLineAsync($"Write successful: {NodeId} = {typedValue}");
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else
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await console.Output.WriteLineAsync($"Write failed: {response.Results[0]}");
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}
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}
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