code: public DiscoverItems discoverItems(Jid entityID) throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException  {
          return discoverItems(entityID, null);
      }
docs: Returns the discovered items of a given XMPP entity addressed by its JID.
  
  @param entityID the address of the XMPP entity.
  @return the discovered information.
  @throws XMPPErrorException if the operation failed for some reason.
  @throws NoResponseException if there was no response from the server.
  @throws NotConnectedException
  @throws InterruptedException