Accepting output of the socket generated by Python in MQL5

Please find a running example. Important element is to create byte object of the payload instead of string before you send as reply. socket object produces and ingests only bytes

    import socket
    import threading
    import sys


    def actual_work(data):
       print(data)
       return b'ACK'

    def daemon():
       sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
       sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
       sock.bind(('127.0.0.1', 6666))
       print("Listening on udp %s:%i" % ('127.0.0.1', 6666))
       try:

          while True:
              data, addr = sock.recvfrom(4096)
              ack = actual_work(data)
              sock.sendto(ack, addr)
       except Exception as e:
          print(e)  
       finally:
          sock.close()


    def client():
       sock = socket.socket( socket.AF_INET, socket.SOCK_DGRAM )
       sock.settimeout(1)
       try:
           sock.sendto(b'payload', ('127.0.0.1', 6666))
           reply, _ = sock.recvfrom(4096)
           print(reply)
       except socket.timeout as e:
           print(e)
           sys.exit(1)
       finally:
           sock.close()

    if __name__ == '__main__':
        thread = threading.Thread(target=daemon)
        thread.start()
        client()
        client()
        client()
        client()
        #Issue kill thread here
        thread.join()