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ModbusClient.cin 

Improved comments
This commit is contained in:
Jonny007-MKD 2014-08-29 15:57:56 +00:00
parent 63f252d32e
commit be86c13ffa
1 changed files with 20 additions and 18 deletions
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38
Modbus-CAPL/include/CAPL/include/ModbusClient.cin
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@ -814,7 +814,8 @@ void _OnModbusReceive(dword socket, long result, dword address, dword port, byte
// Size of zero indicates that the socket was closed by the communication peer.
writeDbg(ConnWarning, "OnModbusReceive: Socket closed by peer");
_ModbusDisconnect();
// Now we have to move the already sent telegrams back to the pending queue to send them again
for (long TxID : gQueueSent)
{
writeDbg(ConnWarning, "OnModbusReceive: Moving 0x%04X back to pending queue", TxID);
@ -826,7 +827,7 @@ void _OnModbusReceive(dword socket, long result, dword address, dword port, byte
}
else
{
// Sucessfully received some bytes over the TCP/IP connection.
// Sucessfully received some bytes over the connection.
_OnModbusReceive2(buffer, size);
}
}
@ -836,7 +837,7 @@ void _OnModbusReceive(dword socket, long result, dword address, dword port, byte
writeDbg(ConnError, "OnModbusReceive error (%d): %s", gIpLastErr, gIpLastErrStr);
_ModbusDisconnect();
}
_ModbusRecv();
_ModbusRecv(); // Continue receiving
}
/// <-OnModbusReceive>
@ -848,24 +849,24 @@ void _OnModbusReceive2(byte buffer[], dword size)
long offset;
char str[3*20];
if (size < 8) // No complete Modbus Application Header
if (size < __size_of(struct ModbusApHeader)) // No complete Modbus Application Header fits into this data
return;
offset = 0;
do
{
memcpy_n2h(mbap, buffer, offset);
memcpy_n2h(mbap, buffer, offset); // Copy the data into the Modbus Header
writeDbg(ConnDebug, "OnModbusReceive2: Offset pre = %d. TxID = %d", offset, mbap.TxID);
_OnModbusReceive2OnePacket(buffer, offset, mbap);
offset += __offset_of(struct ModbusApHeader, UnitID) + mbap.Length;
_OnModbusReceive2OnePacket(buffer, offset, mbap); // Parse the resulting telegram
offset += __offset_of(struct ModbusApHeader, UnitID) + mbap.Length; // Move to the next telegram
writeDbg(ConnDebug, "OnModbusReceive2: offset post = %d. %d <= %d?", offset, offset, size-8);
}
while(offset <= size-8); // We need at least 8 bytes for a new packet
while (offset <= size-8); // We need at least 8 bytes for a new packet
writeDbg(ConnDebug, "OnModbusReceive2: yes. finished");
if (offset != size) // Can be removed.
{
if (offset != size) // If the offset is not pointing at the end of the data
{ // This is a indicator that the length field in the Modbus Header was incorrect (attempt to spam the connection?)
bin_to_strhex(buffer, str);
writeDbg(ConnError, "OnModbusReceive2: Error while going through receive buffer. Our final offset is %d, but the size of the buffer is %d! Buffer: %s", offset, size, str);
OnModbusClientPanics(ParsingBuffer);
@ -878,28 +879,29 @@ void _OnModbusReceive2(byte buffer[], dword size)
// It gets called by _OnModbusReceive2()
void _OnModbusReceive2OnePacket(byte buffer[], int offset, struct ModbusApHeader mbap)
{
// Test transaction identifier?
// Test unit/device identifier?
// Should we test the transaction identifier?
// Should we test the unit/device identifier?
word i; // counter
word length; // length of current packet
length = __offset_of(struct ModbusApHeader, UnitID) + mbap.Length;
// We cannot check this properly anymore. We have to trust the TCP/UDP stack and the sender... *sigh*
length = __offset_of(struct ModbusApHeader, UnitID) + mbap.Length; // the length of the complete telegram
if (mbap.Protocol != 0) // Protocol is not Modbus (0x0000). Wayne.
{
writeDbg(ConnDebug, "OnModbusReceive2OnePacket: packet is no Modbus packet: Protocol = %d", mbap.Protocol);
writeDbg(ConnDebug, "OnModbusReceive2OnePacket: Packet is no Modbus packet: Protocol = %d", mbap.Protocol);
return;
}
if (elCount(buffer) < offset + length) // packet larger than the (rest of the) buffer
{
writeDbg(ConnError, "OnModbusReceive2OnePacket: packet did not fit into Buffer: buffer length = %d, packet length = %d, offset = %d", elCount(buffer), __offset_of(struct ModbusApHeader, UnitID) + mbap.Length, offset);
// either the length field is incorrect or the package is fragmented in the buffer
// I REALLY don't want to assemble the two package fragments.
OnModbusClientPanics(ModbusPackageWasSplit);
return;
}
// MBAP Header is OK :) Go on
if (!gQueueSent.ContainsKey(mbap.TxID)) // We don't wait for this message!?
if (!gQueueSent.ContainsKey(mbap.TxID)) // We don't wait for this message!? Skip it.
return;
//write("Received TxID: %d", mbap.TxID);
@ -1006,7 +1008,7 @@ void _OnModbusReceive2Success(byte buffer[], struct ModbusApHeader mbap, int off
// ------------------------------------------------------------------------------------
// REGION: ModbusSend -----------------------------------------------------------------
/// <-ModbusSend>
// This method will enqueue the data in gQueuePending and start gtModbusRobin if appropriate
// This method will enqueue the data into gQueuePending and start gtModbusRobin if appropriate
// It will get called by the Modbus request functions
void _ModbusSend(byte buffer[], word length, word TxID)
{