42 lines
1.5 KiB
C#
42 lines
1.5 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("read", Description = "Read a value from a node")]
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public class ReadCommand : ICommand
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{
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/// <summary>
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/// Gets the OPC UA endpoint URL to connect to before reading.
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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 whose value should be read.
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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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/// Connects to the endpoint, reads the target node, and prints the returned value details.
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/// </summary>
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/// <param name="console">The console used to report the read 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 value = await session.ReadValueAsync(node);
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await console.Output.WriteLineAsync($"Node: {NodeId}");
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await console.Output.WriteLineAsync($"Value: {value.Value}");
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await console.Output.WriteLineAsync($"Status: {value.StatusCode}");
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await console.Output.WriteLineAsync($"Source Time: {value.SourceTimestamp:O}");
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await console.Output.WriteLineAsync($"Server Time: {value.ServerTimestamp:O}");
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}
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}
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