code: private void sendToRemote(String nodeId) {
          unitRequest.getContext().setDestinationNodeId(nodeId);
          /*unitRequest.getContext().setSourceNodeId(LocalNodeManager.LOCAL_NODE_ID); let the node instance to fill this source node id property*/
          LocalNodeManager.sendLoadBalanced(unitRequest, callback);
      }
docs: send message to remote asynchronously.
  
  @param nodeId the destination node id.