I've been trying to establish a socket communication between Flexsim and a Linux c++ script, but i had no sucess. Someone can help me. I put here the photos of each code i'm using. 
Socket communication Flexsim (Windows) and Linux c++ script
FlexSim 24.1.0
What fails, exactly? Does the C++ code accept the connection? Or does FlexSim not receive the response?
Also, be aware that the On Run Stop trigger fires every time you click the stop button. I would probably just make sure the socket is connected on reset, and then leave it open.
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I can't debug your C++ program. But I made this demo that works on a local computer (127.0.0.1).
The python script makes a simple socket echo server. If you have python installed, you can run the file from a command prompt like so:
cd path/to/folder python -m echo_server.py
If you run that file, the server just sends and receives in a loop. Once the server is running, you can run the model and see that the model is sending and receiving via the socket. For me, this all worked fine, so I don't think it's an issue with FlexSim's socket code.
It looks like you're trying to connect to a different computer. Sometimes firewalls or other network issues can prevent sockets.
Note: I tested this with Python 3.11.
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