code: public CustomMessage send(InetAddress server, int port, CustomMessage request) {
          return ctx.getNetworkHandler().send(server, port, request);
      }
docs: Send a custom message to a specific node (that should implement handling for this message type) and returns
  the response, which in turn is expected to be a {@link CustomMessage}.
  
  @param server  the node's address
  @param port    the node's port
  @param request the request
  @return the response