import time

import zmq

c = zmq.Context()
s = c.socket(zmq.REP)
# s.setsockopt(zmq.HEARTBEAT_IVL, 1000)
# s.setsockopt(zmq.HEARTBEAT_TTL, 1000)
# s.setsockopt(zmq.HEARTBEAT_TIMEOUT, 1000)
s.bind('tcp://127.0.0.1:5555')
while True:
    s.recv()
    print('recv')
    time.sleep(2)
    print('send')
    s.send(b'hello')
    # break