code: public function getDataInterface()
      {
          if (!$this->started) {
              return $this->_interface;
          }
          if (is_null($this->_interface)) {
              $interfaces = ArrayHelper::map(Yii::$app->collectors['dataInterfaces']->getAll(), 'systemId', 'object.name');
              $this->dataInterface = $this->select("Choose interface", $interfaces);
          }
  
          return $this->_interface;
      }
docs: Get interface.
  
  @return Item The data interface