docs: public MucConfigFormManager setRoomSecret(String secret)
                      throws MucConfigurationNotSupportedException {
          if (!answerForm.hasField(MUC_ROOMCONFIG_ROOMSECRET)) {
              throw new MucConfigurationNotSupportedException(MUC_ROOMCONFIG_ROOMSECRET);
          }
          answerForm.setAnswer(MUC_ROOMCONFIG_ROOMSECRET, secret);
          return this;
      }