Joseph Doherty
530f1b2f0b
P3: a torn-down socket is re-dialled inside the gate (one attempt per backoff window) instead of failing fast with 'Transport not connected' until the 90 s comms-loss watchdog re-initialised the driver. L3: ConnectAsync disposes the previous/failed TcpClient, DNS runs under the per-op timeout, and the reconnect never sleeps inside the gate (the old 10-attempt backoff held it for ~81 s). H9: an MBAP response with no PDU, or an exception PDU with no code, is a TruncatedFrame desync rather than an IndexOutOfRangeException. Refs #741 Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT
24 lines
1.2 KiB
C#
24 lines
1.2 KiB
C#
namespace ZB.MOM.WW.OtOpcUa.Driver.Modbus;
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/// <summary>
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/// Raised when a Modbus transport has no live socket and cannot get one for this call: the one
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/// in-gate connect attempt failed, the reconnect is inside its backoff window, or auto-reconnect is
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/// disabled. It says the ENDPOINT is unreachable, so the driver fails the rest of the batch fast
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/// instead of paying the same failure once per tag.
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/// </summary>
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/// <remarks>
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/// Derives from <see cref="IOException"/> so every existing socket-level classifier
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/// (<c>ModbusSocketLifecycle.IsSocketLevelFailure</c>, the driver's comms-fault mapping) treats it as
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/// a communication failure without extra plumbing.
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/// </remarks>
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public sealed class ModbusTransportUnavailableException : IOException
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{
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/// <summary>Initializes a new instance of the <see cref="ModbusTransportUnavailableException"/> class.</summary>
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/// <param name="message">A human-readable description.</param>
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/// <param name="inner">The originating exception, if any.</param>
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public ModbusTransportUnavailableException(string message, Exception? inner = null)
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: base(message, inner)
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{
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}
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}
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