A listener node which is a server. It simply connects, receives a message, prints it out, ends.

SocketServerListener.py

import socket

# An IP address for communication
IP_ADDR = "127.0.0.1"   # Internal loop back
# Port to connect to
PORT_NO = 50001

with socket.socket(
    socket.AF_INET, socket.SOCK_STREAM
) as skt:
    # Connect and initialize the socket
    skt.bind((IP_ADDR, PORT_NO))
    # Listen for connections
    skt.listen(1)   # Queue size 1
    # Accept a connection
    conn_skt, addr = skt.accept()
    # Communication started
    with conn_skt:
        print("Connection from {}".format(addr))
        while True:
            data = conn_skt.recv(1024)
            if not data:
                break
            print("Received", data)