docs: public boolean isSupported() throws NoResponseException, XMPPErrorException, NotConnectedException, InterruptedException {
          // Note that this may return 'null' but SDM's supportsFeature() does the right thing™ then.
          Jid archiveAddress = getArchiveAddress();
          return serviceDiscoveryManager.supportsFeature(archiveAddress, MamElements.NAMESPACE);
      }