docs: public static boolean serverSupportsSecretKeyBackups(XMPPConnection connection)
              throws XMPPException.XMPPErrorException, SmackException.NotConnectedException, InterruptedException,
              SmackException.NoResponseException {
          return ServiceDiscoveryManager.getInstanceFor(connection)
                  .serverSupportsFeature(PubSubFeature.access_whitelist.toString());
      }