protected override bool RetryReadResponse(IModbusRequest request, IModbusResponse response)
{
// Do not retry for these on invalid function code or slave address
return(request.FunctionCode == response.FunctionCode &&
request.SlaveAddress == response.SlaveAddress &&
request.TransactionId > response.TransactionId &&
request.TransactionId - response.TransactionId < RetryOnOldResponseThreshold);
}
protected override void Validate(IModbusRequest request, IModbusResponse response)
{
request.Validate(response);
if (request.TransactionId != response.TransactionId)
{
throw new IOException($"Received unexpected transaction Id. Expected: {request.TransactionId}. Received: {response.TransactionId}.");
}
}
protected override async Task WriteRequestAsync(IModbusRequest request, CancellationToken token = default)
{
using var memoryOwner = MemoryPool <byte> .Shared.Rent(MbapHeaderSizeOnRequest + request.ByteSize);
var memory = memoryOwner.Memory;
BitConverter.TryWriteBytes(memory.Slice(0, 2).Span, IPAddress.HostToNetworkOrder((short)request.TransactionId));
memory.Span[2] = 0;
memory.Span[3] = 0;
BitConverter.TryWriteBytes(memory.Slice(4, 2).Span, IPAddress.HostToNetworkOrder((short)(request.ByteSize + 1)));
memory.Span[6] = request.SlaveAddress;
request.WriteTo(memory.Slice(MbapHeaderSizeOnRequest, request.ByteSize));
await PipeResource.WriteAsync(memory.Slice(0, MbapHeaderSizeOnRequest + request.ByteSize), token).ConfigureAwait(false);
}
protected override async Task WriteRequestAsync(IModbusRequest request, CancellationToken token = default)
{
var totalSize = SlaveAddressSize + CrcSize + request.ByteSize;
using var memoryOwner = MemoryPool <byte> .Shared.Rent(totalSize);
var memory = memoryOwner.Memory;
memory.Span[0] = request.SlaveAddress;
request.WriteTo(memory.Slice(SlaveAddressSize, request.ByteSize));
ushort crc = crcCalculator.Calculate(memory.Slice(0, SlaveAddressSize + request.ByteSize));
BitConverter.TryWriteBytes(memory.Slice(SlaveAddressSize + request.ByteSize, CrcSize).Span, crc);
await PipeResource.WriteAsync(memory.Slice(0, totalSize), token).ConfigureAwait(false);
}
protected override void Validate(IModbusRequest request, IModbusResponse response)
{
request.Validate(response);
}
protected override bool RetryReadResponse(IModbusRequest request, IModbusResponse response)
{
return(false);
}
internal static void SetupValidate(this Mock <ModbusTransport> mock, IModbusRequest request, IModbusResponse response)
{
mock.Protected().As <IModbusTransportMock>().Setup(x => x.Validate(request, response));
}
internal static void SetupRetryReadResponse(this Mock <ModbusTransport> mock, IModbusRequest request, IModbusResponse response, params bool[] results)
{
if (results.Length == 1)
{
mock.Protected()
.As <IModbusTransportMock>()
.Setup(x => x.RetryReadResponse(request, response))
.Returns(results[0]);
return;
}
var sequenceMock = mock.Protected()
.As <IModbusTransportMock>()
.SetupSequence(x => x.RetryReadResponse(request, response));
foreach (var item in results)
{
sequenceMock
.Returns(item);
}
}
public void ValidatesResponse(IModbusRequest request, IModbusResponse response)
{
// Arrange/Act/Assert
Assert.Throws <IOException>(() => request.Validate(response));
}