code: def device(device_type, isocket, osocket):
      """Start a zeromq device (gevent-compatible).
  
      Unlike the true zmq.device, this does not release the GIL.
  
      Parameters
      ----------
      device_type : (QUEUE, FORWARDER, STREAMER)
          The type of device to start (ignored).
      isocket : Socket
          The Socket instance for the incoming traffic.
      osocket : Socket
          The Socket instance for the outbound traffic.
      """
      p = Poller()
      if osocket == -1:
          osocket = isocket
      p.register(isocket, zmq.POLLIN)
      p.register(osocket, zmq.POLLIN)
  
      while True:
          events = dict(p.poll())
          if isocket in events:
              osocket.send_multipart(isocket.recv_multipart())
          if osocket in events:
              isocket.send_multipart(osocket.recv_multipart())
  
label_desc: Use image node_id 1 for calling a global function with example usage: device(device_type, isocket, osocket) without return types