public async Task ThrowsOnSlaveExceptionResponse(SlaveExceptionCode exceptionCode)
{
// Arrange
var target = new Mock <ModbusTransport>(new Mock <IPipeResource>().Object, Mock.Of <ITransactionIdProvider>(), Mock.Of <ILogger <IModbusMaster> >())
{
CallBase = true
};
var request = new ReadHoldingRegistersRequest(1, 1, 1);
var response = ModbusResponseFactory.CreateResponse <SlaveExceptionResponse>(
new byte[] { 1, 129, (byte)exceptionCode });
target.SetupWriteRequestAsync(request);
target.SetupReadResponseAsync <ReadHoldingRegistersResponse>(response);
// Act
var ex = await Assert.ThrowsAsync <SlaveException>(() => target.Object.SendAsync <ReadHoldingRegistersResponse>(request));
// Assert
Assert.Equal(1, ex.SlaveAddress);
Assert.Equal(129, ex.FunctionCode);
Assert.Equal(exceptionCode, ex.SlaveExceptionCode);
target.Protected().As <IModbusTransportMock>()
.Verify(x => x.WriteRequestAsync(request, It.IsAny <CancellationToken>()), Times.Once());
target.Protected().As <IModbusTransportMock>()
.Verify(x => x.ReadResponseAsync <ReadHoldingRegistersResponse>(It.IsAny <CancellationToken>()), Times.Once());
}
public override void Initialize(ReadOnlySpan <byte> frame)
{
base.Initialize(frame);
if (FunctionCode <= Constants.ExceptionOffset)
{
throw new FormatException("Invalid function code value for SlaveExceptionResponse.");
}
SlaveExceptionCode = (SlaveExceptionCode)frame[2];
}
