code: def start_service(addr, n):
      
  
      s = Subscriber(addr)
      s.socket.set_string_option(nanomsg.SUB, nanomsg.SUB_SUBSCRIBE, 'test')
  
      started = time.time()
      for _ in range(n):
          msg = s.socket.recv()
      s.socket.close()
      duration = time.time() - started
  
      print('Raw SUB service stats:')
      util.print_stats(n, duration)
      return
docs: Start a service