Super simply python client that will listen on a port and reply with received

python_port_listener.py

# python socket info https://docs.python.org/3/library/socket.html
import socket

PORT = 65432
s = socket.socket()
HOST = socket.gethostname()
s.bind((HOST, PORT))
s.listen(5)

print ('Python port listener active')
print('\n This can be tested with: \n`echo Bob Belcher |nc %s %s`\nYou shoud get the message "received"\n' % (HOST, PORT))

while True:
    print('starting up socket')
    conn, addr = s.accept()
    print ('Got connection from', addr)
    data = conn.recv(1024)
    print('Server received', repr(data))

    print(data)

    print('Done sending')
    conn.send(b'received')
    conn.close()
    print('connection closed')