A dead simple TCP MITM proxy for testing.
Exchange data, and print a comprehensive log of everything exchanged.
Configure environment variables or put them in a .env file. See .env.example.
Then start your TCP server at SEND_ADDR, and run forward1.
Then connect your client(s) to LISTEN_ADDR.
When your client connects, forward1 will connect to SEND_ADDR and exchange data. It will disconnect when the client does.
You can kill forward1 to simulate a disconnection.
Some code written with the help of Bing AI/ChatGPT etc.