code: def send(self, service, request):
          
          if not isinstance(request, list):
              request = [request]
  
          # Prefix request with protocol frames
          # Frame 0: empty (REQ emulation)
          # Frame 1: "MDPCxy" (six bytes, MDP/Client x.y)
          # Frame 2: Service name (printable string)
  
          request = ['', MDP.C_CLIENT, service] + request
          if self.verbose:
              logging.warn("I: send request to '%s' service: ", service)
              dump(request)
          self.client.send_multipart(request)
docs: Send request to broker