docs: public DiscoverItems discoverNodes(String nodeId) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
          DiscoverItems items = new DiscoverItems();
  
          if (nodeId != null)
              items.setNode(nodeId);
          items.setTo(pubSubService);
          DiscoverItems nodeItems = connection().createStanzaCollectorAndSend(items).nextResultOrThrow();
          return nodeItems;
      }