public int Send(Iec61850State iecs)
{
// Make COTP data telegramm
int offs = IsoTpkt.TPKT_SIZEOF;
int maxLen = 1 << options.tpduSize; // max COTP len
int maxDataLen = maxLen - COTP_HDR_DT_SIZEOF; // max DATA len
if (iecs.sendBytes <= maxDataLen)
{
// Original handling, same as before / short datagram without fragmenting
iecs.sendBuffer[offs++] = COTP_HDR_DT_SIZEOF - 1; // cotp.hdrlen wihout this field
iecs.sendBuffer[offs++] = COTP_CODE_DT; // code
iecs.sendBuffer[offs++] = COTP_PACKET_COMPLETE; // number "complete" for "short" datagrams
iecs.sendBytes += offs;
IsoTpkt.Send(iecs);
}
else
{
// Long data, need to fragment to TPKT + COTP fragments
// Technique: allocate a new buffer. Keep the original data.
// Copy original data "per partes" to the new buffer, adding TPKT and COTP headers
// and sending the fragments via TCP.
// Last COTP fragments must be marked 0x80, others 0x00
// Possible optimization: for the first fragment use the original buffer (spare 1 copy operation) NOT IMPLEMENTED
int dLen = iecs.sendBytes; // Actual data length
int sLen = 0; // Actual sent data length
byte[] originalData = iecs.sendBuffer;
iecs.sendBuffer = dataReserveBuffer; // Use saved / recycled buffer
dataReserveBuffer = originalData; // Save original buffer to reserve for future use / recycling saves allocation oper.
const int dOffs = IsoTpkt.TPKT_SIZEOF + COTP_HDR_DT_SIZEOF;
while (dLen > 0)
{
iecs.sendBytes = Math.Min(dLen, maxDataLen);
Array.Copy(originalData, dOffs + sLen, iecs.sendBuffer, dOffs, iecs.sendBytes);
dLen -= iecs.sendBytes;
sLen += iecs.sendBytes;
offs = IsoTpkt.TPKT_SIZEOF; // reinit offset
iecs.sendBuffer[offs++] = COTP_HDR_DT_SIZEOF - 1; // cotp.hdrlen wihout this field
iecs.sendBuffer[offs++] = COTP_CODE_DT; // code
iecs.sendBuffer[offs++] = (byte)((dLen > 0) ? COTP_PACKET_FRAGMENT : COTP_PACKET_COMPLETE); // number "fragment" or "complete"
iecs.sendBytes += offs;
IsoTpkt.Send(iecs);
}
}
return(0);
}
public int SendInit(Iec61850State iecs)
{
//Reset dstref
Reset(iecs.cp);
// Make COTP init telegramm
int offs = IsoTpkt.TPKT_SIZEOF;
int optof = COTP_HDR_IDX_OPTION;
iecs.sendBuffer[offs + COTP_HDR_IDX_HDRLEN] = (byte)(COTP_HDR_CR_SIZEOF + options.getSize());
iecs.sendBuffer[offs + COTP_HDR_IDX_CODE] = COTP_CODE_CR;
Array.Copy(BitConverter.GetBytes(IPAddress.HostToNetworkOrder(m_COTP_dstref)), 0, iecs.sendBuffer, offs + COTP_HDR_IDX_DSTREF, 2);
Array.Copy(BitConverter.GetBytes(IPAddress.HostToNetworkOrder(m_COTP_srcref)), 0, iecs.sendBuffer, offs + COTP_HDR_IDX_SRCREF, 2);
iecs.sendBuffer[offs + optof++] = m_COTP_option;
// Parameters
iecs.sendBuffer[offs + optof++] = COTP_PCODE_TSIZ;
iecs.sendBuffer[offs + optof++] = 1;
iecs.sendBuffer[offs + optof++] = options.tpduSize;
if (options.tSelDst.size > 0)
{
iecs.sendBuffer[offs + optof++] = COTP_PCODE_DSAP;
iecs.sendBuffer[offs + optof++] = options.tSelDst.size;
byte[] bt = options.tSelDst.GetBytes();
Array.Copy(bt, 0, iecs.sendBuffer, offs + optof, options.tSelDst.size);
optof += options.tSelDst.size;
}
if (options.tSelSrc.size > 0)
{
iecs.sendBuffer[offs + optof++] = COTP_PCODE_SSAP;
iecs.sendBuffer[offs + optof++] = options.tSelSrc.size;
Array.Copy(options.tSelSrc.GetBytes(), 0, iecs.sendBuffer, offs + optof, options.tSelSrc.size);
}
iecs.sendBytes = offs + COTP_HDR_CR_SIZEOF + 1 + options.getSize();
IsoTpkt.Send(iecs);
return(0);
}
int fastSend(Iec61850State iecs)
{
// Make COTP data telegramm directly
int offs = IsoTpkt.TPKT_SIZEOF;
// MMS already encoded in iecs.msMMSout
iecs.sendBytes = (int)iecs.msMMSout.Length;
iecs.sendBuffer[offs++] = 0x02; // cotp.hdrlen
iecs.sendBuffer[offs++] = IsoCotp.COTP_CODE_DT; // code
iecs.sendBuffer[offs++] = 0x80; // number "complete"
iecs.sendBuffer[offs++] = 0x01; // giveTokensPDU.type
iecs.sendBuffer[offs++] = 0x00; // giveTokensPDU.hdrlen
iecs.sendBuffer[offs++] = 0x01; // dataTransferPDU.type
iecs.sendBuffer[offs++] = 0x00; // dataTransferPDU.hdrlen
iecs.sendBuffer[offs++] = 0x61; // pres.dtpdu_tag
iecs.sendBuffer[offs++] = 0x82; // pres.dtpdu_len_code
Array.Copy(BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)(iecs.sendBytes + 15 - 4))), 0, iecs.sendBuffer, offs, 2); // pres.dtpdu_len
offs += 2;
iecs.sendBuffer[offs++] = 0x30; // pres.sequ_tag
iecs.sendBuffer[offs++] = 0x82; // pres.sequ_len_code
Array.Copy(BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)(iecs.sendBytes + 15 - 8))), 0, iecs.sendBuffer, offs, 2); // pres.sequ_len
offs += 2;
iecs.sendBuffer[offs++] = 0x02; // pres.context_tag
iecs.sendBuffer[offs++] = 0x01; // pres.context_len
iecs.sendBuffer[offs++] = 0x03; // pres.context_val
iecs.sendBuffer[offs++] = 0xa0; // pres.data_tag
iecs.sendBuffer[offs++] = 0x82; // pres.data_len_code
Array.Copy(BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)(iecs.sendBytes))), 0, iecs.sendBuffer, offs, 2); // pres.sequ_len
offs += 2;
iecs.msMMSout.Seek(0, SeekOrigin.Begin);
iecs.msMMSout.Read(iecs.sendBuffer, offs, iecs.sendBytes);
iecs.sendBytes += offs;
IsoTpkt.Send(iecs);
return(0);
}