static public byte[] RequestExchange(byte[] pdubytes)
{
// At this time the only thing I want to handle is a SZL-Request of SZL ID 0x0131 Index 3 and
// make my own response to it.
// So do it the simple way...
bool header_ok, parameter_ok, data_ok;
short SZL_id, SZL_index;
// 1. Check length: A SZL request is 26 bytes long
if (pdubytes.Length == 26)
{
// 2. Check Header
header_ok = (pdubytes[0] == 0x32 && pdubytes[1] == 0x07 && // Protocol ID, Userdata
pdubytes[6] == 0x00 && pdubytes[7] == 0x08 && // Length of Parameter is 8 bytes
pdubytes[8] == 0x00 && pdubytes[9] == 0x08); // Length of data is 8 bytes
if (header_ok)
{
// 3. Check parameter
parameter_ok = (pdubytes[10] == 0x00 && pdubytes[11] == 0x01 && pdubytes[12] == 0x12 &&
pdubytes[13] == 0x04 && pdubytes[14] == 0x11 && pdubytes[15] == 0x44 &&
pdubytes[16] == 0x01 && pdubytes[17] == 0x00);
if (parameter_ok)
{
// 4. Check data
data_ok = (pdubytes[18] == 0xff && pdubytes[19] == 0x09 &&
pdubytes[20] == 0x00 && pdubytes[21] == 0x04);
if (data_ok)
{
SZL_id = ByteConvert.GetInt16at(pdubytes, 22);
SZL_index = ByteConvert.GetInt16at(pdubytes, 24);
/* 4.11.2015: As we now support cyclic telegrams,
* it is no longer neccessary to build answers for ID 0x0131.
* LED-State SZL still not supported by Plcsim.
*/
//System.Diagnostics.Debug.Print("SZL-Request ID " + SZL_id + " Index " + SZL_index);
//if (SZL_id == 0x0131 && SZL_index == 0x0003)
//{
// return GetSzlId0131_idx3_response(ref pdubytes);
if (SZL_id == 0x0074 && SZL_index == 0x0000)
{
return(GetSzlId0x0074_response(ref pdubytes));
}
else if (SZL_id == 0x0f74 && SZL_index == 0x0000)
{
return(GetSzlId0x0f74_idx0_response(ref pdubytes));
}
else if (SZL_id == 0x0174)
{
return(GetSzlId0x0174_response(SZL_index, ref pdubytes));
}
/*
* else if (SZL_id == 0x0011)
* {
* return GetSzlId0x0011_response(ref pdubytes);
* }
* else if (SZL_id == 0x001c)
* {
* return GetSzlId0x001c_response(ref pdubytes);
* }
* */
}
}
}
}
return(null);
}