hwclient.py

#
#   Hello World client in Python
#   Connects REQ socket to tcp://localhost:5555
#   Sends "Hello" to server, expects "World" back
#
import zmq

context = zmq.Context()

#  Socket to talk to server
print ("Connecting to hello world server...")
socket = context.socket(zmq.REQ)
socket.connect ("tcp://localhost:5555")

#  Do 10 requests, waiting each time for a response
for request in range (1,10):
    print ("Sending request %", request, "...")
    socket.send (b"Hello")
    
    #  Get the reply.
    message = socket.recv()
    print ("Received reply ", request, "[", message.decode(), "]")

hwserver.py

#
#   Hello World server in Python
#   Binds REP socket to tcp://*:5555
#   Expects "Hello" from client, replies with "World"
#
import zmq
import time

context = zmq.Context()
socket = context.socket(zmq.REP)
socket.bind("tcp://*:5555")

while True:
    #  Wait for next request from client
    message = socket.recv()
    print ("Received request: ", message)

    #  Do some 'work'
    time.sleep (1)        #   Do some 'work'

    #  Send reply back to client
    socket.send(b"World")