public static async Task <WriteSingleRegisterHandler> CreateAsync(IMessageBufferReader reader, CancellationToken cancellationToken)
{
var handler = new WriteSingleRegisterHandler();
await handler.InitializeAsync(reader, cancellationToken);
return(handler);
}
public static WriteSingleRegisterHandler Create(IMessageBufferReader reader)
{
var handler = new WriteSingleRegisterHandler();
handler.Initialize(reader);
return(handler);
}
public void HandleRequest(params ModbusDevice[] devices)
{
if (devices is null)
{
throw new ArgumentNullException(nameof(devices));
}
if (devices.Length == 0)
{
throw new ArgumentException();
}
MessageHandler?messageHandler = null;
ModbusDevice? device = null;
var requestContext = ModbusTransport.ReceiveMessage(reader =>
{
var deviceAddress = reader.PushByteFromStream();
device = devices.FirstOrDefault(_ => _.Address == deviceAddress);
if (device == null)
{
throw new InvalidOperationException($"Received request for device with unknown address {deviceAddress}");
}
var functionCode = (ModbusFunctionCode)reader.PushByteFromStream();
messageHandler = functionCode switch
{
ModbusFunctionCode.ReadDiscreteInputs => ReadDiscreteInputsHandler.Create(reader),
ModbusFunctionCode.ReadCoils => ReadCoilsHandler.Create(reader),
ModbusFunctionCode.ReadInputRegisters => ReadInputRegistersHandler.Create(reader),
ModbusFunctionCode.ReadHoldingRegisters => ReadHoldingRegistersHandler.Create(reader),
ModbusFunctionCode.WriteSingleCoil => WriteSingleCoilHandler.Create(reader),
ModbusFunctionCode.WriteSingleRegister => WriteSingleRegisterHandler.Create(reader),
ModbusFunctionCode.WriteMultipleCoils => WriteMultipleCoilsHandler.Create(reader),
ModbusFunctionCode.WriteMultipleRegisters => WriteMultipleRegistersHandler.Create(reader),
ModbusFunctionCode.ReadWriteMultipleRegisters => ReadWriteMultipleRegistersHandler.Create(reader),
_ => throw new NotSupportedException($"Function {functionCode} not supported"),
};
});
if (messageHandler is WriteHandler writeHandler)
{
writeHandler.UpdateMemory(device !);
}
ModbusTransport.SendMessage(requestContext, writer =>
{
messageHandler !.WriteResponse(device !, writer);
});