public static byte[] ReadRequestResponse(TcpStreamAdapter tcpTransportAdapter)
{
// read header
byte[] mbapHeader = new byte[6];
int numBytesRead = 0;
while (numBytesRead != 6)
{
numBytesRead += tcpTransportAdapter.Read(mbapHeader, numBytesRead, 6 - numBytesRead);
if (numBytesRead == 0)
{
throw new SocketException(Modbus.ConnectionAborted);
}
}
_log.DebugFormat("MBAP header: {0}", StringUtility.Join(", ", mbapHeader));
ushort frameLength = (ushort)(IPAddress.HostToNetworkOrder(BitConverter.ToInt16(mbapHeader, 4)));
_log.DebugFormat("{0} bytes in PDU.", frameLength);
// read message
byte[] messageFrame = new byte[frameLength];
numBytesRead = 0;
while (numBytesRead != frameLength)
{
numBytesRead += tcpTransportAdapter.Read(messageFrame, numBytesRead, frameLength - numBytesRead);
if (numBytesRead == 0)
{
throw new SocketException(Modbus.ConnectionAborted);
}
}
_log.DebugFormat("PDU: {0}", frameLength);
byte[] frame = CollectionUtility.Concat(mbapHeader, messageFrame);
_log.InfoFormat("RX: {0}", StringUtility.Join(", ", frame));
return(frame);
}
public ModbusTcpTransport(TcpStreamAdapter tcpStreamAdapter)
{
_tcpStreamAdapter = tcpStreamAdapter;
}
