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Read TPKT/COTP packets / Read MaxPDU size from PLC

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Read responses from the PLS using classes for TPKT and COPT. This
makes the communication more robust. It will now handle empty COTP
packets that SoftPLS and WinAC based PLCs send out. I use RFC names for
functions and classes.

Change logic to use COTP and S7Comm reponse codes instead of
relying on packet sizes.

Read Max PDU size from connection setup. Ref #21
Change logic to use MaxPDUSize when reading istead of hardcoded limit.

I tried using MaxPDUSize when writing data but this failed when packet size is
over 256 on snap7. So i decided to drop changes to write size.
I have done some tests against WinAC cpu and it seems to handle bigger pdu's
when writing if negotiated in the connection setup. This might just be a SNAP7 bug.

Fix MaxPDUSize for readbytes

Remove debug line

Simplify byte copy. Remove unessesarry buffer
This commit is contained in:
Thomas Jäger
2018-04-19 00:31:04 +02:00
parent f740ba0078
commit 50b026d7a5
4 changed files with 209 additions and 49 deletions
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2
S7.Net/S7.Net.csproj
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@@ -77,9 +77,11 @@
</ItemGroup>
<ItemGroup>
<Compile Include="Conversion.cs" />
<Compile Include="COTP.cs" />
<Compile Include="Enums.cs" />
<Compile Include="PLC.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
<Compile Include="TPKT.cs" />
<Compile Include="Types\Bit.cs" />
<Compile Include="Types\Boolean.cs" />
<Compile Include="Types\Byte.cs" />