am-wd/AMWD.Protocols.Modbus
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Fixed wrong 'following bytes' information in TCP proxy

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This commit is contained in:
Andreas Müller
2025-01-21 19:26:13 +01:00
parent 96b5ee21c8
commit ec0ba31b86
7 changed files with 58 additions and 28 deletions
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4
AMWD.Protocols.Modbus.Common/Contracts/ModbusClientBase.cs
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@@ -1,9 +1,9 @@
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using System.Threading;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace AMWD.Protocols.Modbus.Common.Contracts
{

2
AMWD.Protocols.Modbus.Common/Exceptions/ModbusException.cs
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@@ -1,6 +1,8 @@
using System;
using System.Diagnostics.CodeAnalysis;
#if !NET8_0_OR_GREATER
using System.Runtime.Serialization;
#endif
namespace AMWD.Protocols.Modbus.Common
{

4
AMWD.Protocols.Modbus.Common/Models/ModbusObject.cs
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@@ -1,4 +1,6 @@
using System;
#if NET6_0_OR_GREATER
using System;
#endif
namespace AMWD.Protocols.Modbus.Common
{

4
AMWD.Protocols.Modbus.Common/Protocols/RtuOverTcpProtocol.cs
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@@ -10,7 +10,9 @@ namespace AMWD.Protocols.Modbus.Common.Protocols
/// </summary>
/// <remarks>
/// The Modbus RTU over Modbus TCP is rarely used.
/// It is a non-standard variant of Modbus TCP that includes wrapps a Modbus RTU message within a Modbus TCP message.
/// It is a non-standard variant:
/// You can define it as RTU message with an additional TCP header
/// or as TCP message with an additional CRC16 checksum at the end (header not included!).
/// <br/>
/// Definition found on <see href="https://www.fernhillsoftware.com/help/drivers/modbus/modbus-protocol.html">Fernhill Software</see>.
/// </remarks>

53
AMWD.Protocols.Modbus.Proxy/ModbusTcpProxy.cs
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@@ -370,7 +370,7 @@ namespace AMWD.Protocols.Modbus.Proxy
responseBytes.Add((byte)ModbusErrorCode.SlaveDeviceFailure);
}
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
private async Task<byte[]> HandleReadDiscreteInputsAsync(byte[] requestBytes, CancellationToken cancellationToken)
@@ -409,7 +409,7 @@ namespace AMWD.Protocols.Modbus.Proxy
responseBytes.Add((byte)ModbusErrorCode.SlaveDeviceFailure);
}
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
private async Task<byte[]> HandleReadHoldingRegistersAsync(byte[] requestBytes, CancellationToken cancellationToken)
@@ -443,7 +443,7 @@ namespace AMWD.Protocols.Modbus.Proxy
responseBytes.Add((byte)ModbusErrorCode.SlaveDeviceFailure);
}
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
private async Task<byte[]> HandleReadInputRegistersAsync(byte[] requestBytes, CancellationToken cancellationToken)
@@ -477,7 +477,7 @@ namespace AMWD.Protocols.Modbus.Proxy
responseBytes.Add((byte)ModbusErrorCode.SlaveDeviceFailure);
}
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
private async Task<byte[]> HandleWriteSingleCoilAsync(byte[] requestBytes, CancellationToken cancellationToken)
@@ -494,7 +494,8 @@ namespace AMWD.Protocols.Modbus.Proxy
{
responseBytes[7] |= 0x80;
responseBytes.Add((byte)ModbusErrorCode.IllegalDataValue);
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
try
@@ -524,7 +525,7 @@ namespace AMWD.Protocols.Modbus.Proxy
responseBytes.Add((byte)ModbusErrorCode.SlaveDeviceFailure);
}
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
private async Task<byte[]> HandleWriteSingleRegisterAsync(byte[] requestBytes, CancellationToken cancellationToken)
@@ -564,7 +565,7 @@ namespace AMWD.Protocols.Modbus.Proxy
responseBytes.Add((byte)ModbusErrorCode.SlaveDeviceFailure);
}
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
private async Task<byte[]> HandleWriteMultipleCoilsAsync(byte[] requestBytes, CancellationToken cancellationToken)
@@ -583,7 +584,8 @@ namespace AMWD.Protocols.Modbus.Proxy
{
responseBytes[7] |= 0x80;
responseBytes.Add((byte)ModbusErrorCode.IllegalDataValue);
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
try
@@ -623,7 +625,7 @@ namespace AMWD.Protocols.Modbus.Proxy
responseBytes.Add((byte)ModbusErrorCode.SlaveDeviceFailure);
}
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
private async Task<byte[]> HandleWriteMultipleRegistersAsync(byte[] requestBytes, CancellationToken cancellationToken)
@@ -642,7 +644,8 @@ namespace AMWD.Protocols.Modbus.Proxy
{
responseBytes[7] |= 0x80;
responseBytes.Add((byte)ModbusErrorCode.IllegalDataValue);
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
try
@@ -679,7 +682,7 @@ namespace AMWD.Protocols.Modbus.Proxy
responseBytes.Add((byte)ModbusErrorCode.SlaveDeviceFailure);
}
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
private async Task<byte[]> HandleEncapsulatedInterfaceAsync(byte[] requestBytes, CancellationToken cancellationToken)
@@ -691,7 +694,8 @@ namespace AMWD.Protocols.Modbus.Proxy
{
responseBytes[7] |= 0x80;
responseBytes.Add((byte)ModbusErrorCode.IllegalFunction);
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
var firstObject = (ModbusDeviceIdentificationObject)requestBytes[10];
@@ -699,7 +703,8 @@ namespace AMWD.Protocols.Modbus.Proxy
{
responseBytes[7] |= 0x80;
responseBytes.Add((byte)ModbusErrorCode.IllegalDataAddress);
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
var category = (ModbusDeviceIdentificationCategory)requestBytes[9];
@@ -707,7 +712,8 @@ namespace AMWD.Protocols.Modbus.Proxy
{
responseBytes[7] |= 0x80;
responseBytes.Add((byte)ModbusErrorCode.IllegalDataValue);
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
try
@@ -764,7 +770,8 @@ namespace AMWD.Protocols.Modbus.Proxy
bodyBytes[5] = numberOfObjects;
responseBytes.AddRange(bodyBytes);
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
bodyBytes.AddRange(objBytes);
@@ -773,13 +780,15 @@ namespace AMWD.Protocols.Modbus.Proxy
bodyBytes[5] = numberOfObjects;
responseBytes.AddRange(bodyBytes);
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
catch
{
responseBytes[7] |= 0x80;
responseBytes.Add((byte)ModbusErrorCode.SlaveDeviceFailure);
return [.. responseBytes];
return ReturnResponse(responseBytes);
}
}
@@ -863,6 +872,16 @@ namespace AMWD.Protocols.Modbus.Proxy
return [.. result];
}
private static byte[] ReturnResponse(List<byte> response)
{
ushort followingBytes = (ushort)(response.Count - 6);
byte[] bytes = followingBytes.ToBigEndianBytes();
response[4] = bytes[0];
response[5] = bytes[1];
return [.. response];
}
#endregion Request Handling
}
}

15
AMWD.Protocols.Modbus.Serial/ModbusSerialConnection.cs
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@@ -107,9 +107,7 @@ namespace AMWD.Protocols.Modbus.Serial
set => _serialPort.PortName = value;
}
/// <summary>
/// Gets or sets the serial baud rate.
/// </summary>
/// <inheritdoc cref="SerialPort.BaudRate" />
public virtual BaudRate BaudRate
{
get => (BaudRate)_serialPort.BaudRate;
@@ -118,7 +116,11 @@ namespace AMWD.Protocols.Modbus.Serial
/// <inheritdoc cref="SerialPort.DataBits" />
/// <remarks>
/// Should be 7 for ASCII mode and 8 for RTU mode.
/// From the Specs:
/// <br/>
/// On <see cref="AsciiProtocol"/> it can be 7 or 8.
/// <br/>
/// On <see cref="RtuProtocol"/> it has to be 8.
/// </remarks>
public virtual int DataBits
{
@@ -159,9 +161,9 @@ namespace AMWD.Protocols.Modbus.Serial
/// <remarks>
/// From the Specs:
/// <br/>
/// Should be <see cref="StopBits.One"/> for <see cref="Parity.Even"/> or <see cref="Parity.Odd"/> and
/// Should be <see cref="StopBits.One"/> for <see cref="Parity.Even"/> or <see cref="Parity.Odd"/>.
/// <br/>
/// should be <see cref="StopBits.Two"/> for <see cref="Parity.None"/>.
/// Should be <see cref="StopBits.Two"/> for <see cref="Parity.None"/>.
/// </remarks>
public virtual StopBits StopBits
{
@@ -188,7 +190,6 @@ namespace AMWD.Protocols.Modbus.Serial
try
{
_processingTask.Wait();
_processingTask.Dispose();
}
catch

4
CHANGELOG.md
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@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
- The `ModbusTcpProxy.ReadWriteTimeout` has a default value of 100 seconds (same default as a `HttpClient` has).
### Fixed
- Wrong _following bytes_ calculation in `ModbusTcpProxy`.
## [v0.3.2] (2024-09-04)