server.py

import socket

HOST = "localhost"
PORT = 12345
BUFFER_SIZE = 1024


def main():
    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

    try:
        server.bind((HOST, PORT))
        server.listen(5)
        print(f"Server listening on {HOST}:{PORT}...")

        conn, addr = server.accept()
        print(f"Connected by {addr}")

        try:
            buf = conn.recv(BUFFER_SIZE).decode()
            print(f"Received: {buf}")
            conn.send("got it".encode())
        except (ConnectionResetError, UnicodeDecodeError) as e:
            print(f"Communication error: {e}")
        finally:
            conn.close()
            print("Connection closed.")

    except OSError as e:
        print(f"Server error: {e}")
    finally:
        server.close()


if __name__ == "__main__":
    main()