/// <summary>
/// Gets expected response size for request in bytes
/// </summary>
/// <param name="request">Request</param>
/// <returns>Expected response size for request in bytes.
/// Returns 0 if no answer required.
/// Returns MaxPacketSize if size of answer is not predicatble.
/// </returns>
internal static int GetResponseSize(Packet request)
{
int result;
Converter<byte[], bool> check;
if (ResponseSizeCheckData.TryGetValue(request.FunctionNumber, out check))
{
if (check(request._packetBytes))
{
if (request.Device == 0) result = 0;
else
{
Converter<byte[], int> convert;
if (ResponseSizeConvertData.TryGetValue(request.FunctionNumber, out convert))
result = convert(request._packetBytes);
else
throw new NotImplementedException();
}
}
else
throw new ArgumentException(nameof(request));
}
else
throw new ArgumentException(nameof(request));
return result;
}
/// <summary>
/// Creates custom modbus packet
/// </summary>
/// <remarks>No checks</remarks>
/// <param name="device">Slave address</param>
/// <param name="function">Function number</param>
/// <param name="data">Function data</param>
/// <returns>Modbus packet</returns>
public static Packet CreateCustomPacket(byte device, byte function, IEnumerable<byte> data)
{
if (data == null) throw new ArgumentNullException(nameof(data));
var result = new Packet(data.Count() + 2)
{
Device = device,
FunctionNumber = (byte)function
};
result.CopyData(data);
return result;
}