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Beckhoff / TF6000_ADS_DOTNET_V5_Samples

Sample code for the Version 6.X series of the TwinCAT ADS .NET Packages
https://infosys.beckhoff.com/content/1033/tc3_ads.net/9407515403.html?id=6770980177009971601
BSD Zero Clause License
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Sending data to server after reconnect does not (always) work #54

Closed jonev-akva closed 8 months ago

jonev-akva commented 9 months ago

Hi, This might be related to issue #53, but creating this to showcase that this might be a side-effect of #53. As mentioned in #53, there is some inconsistent behavior which means that the error is not reproducible 100% of the time.

This unit test showcases the issue. As mention in the code, this is the following scenario where the issue with reconnection does not work;

  1. Client is sending a message which should be directed to the server without errors.
  2. The server disconnects
  3. Sending an message while the server is disconnected. This has a inconsistent result. Sometimes it returns "NoError" and either Succeeded or Failed. Sometimes it returns Failed and TargetPortNotFound.
  4. The server connects again
  5. Sending a message to the server.
    • When 3. returns TargetPortNotFound, this also returns TargetPortNotFound - which means that the communication does not work after the reconnect.
    • When 3. returns "NoError", this returns Ok - which means that the communication works after reconnect

In our production environment we will have some network and power loss which means that we need re-connection to work seamlessly.

RalfHeitmann commented 8 months ago

see answers in #53

jonev-akva commented 8 months ago

Hi, @RalfHeitmann , thank you for fixing this, the new version of the libraries did resolve this issue in the unit tests. Did you find any correlation between this and #53 ?

RalfHeitmann commented 8 months ago

The issues are dependent somehow and are - as you stated - fixed with the new version and the given background hints in #53 I close the issues therefore ...