code: public VacuumSounpackInstallState soundpackInstallStatus() throws CommandExecutionException {
          JSONArray ret = sendToArray("get_sound_progress");
          if (ret == null) return null;
          return new VacuumSounpackInstallState(ret.optJSONObject(0));
      }
docs: Get the current soundpack installation status.
  @return The current soundpack installation status.
  @throws CommandExecutionException When there has been a error during the communication or the response was invalid.