/**
  * Get a model to store the config
  *
  * @param boolean $valueMask MAsk the password or if false decrypt it
  * @return \Gems_Model_JoinModel
  */
 protected function getConfigModel($valueMask = true)
 {
     if (!$this->_configModel) {
         $model = new \MUtil_Model_TableModel('gems__radius_config', 'config');
         // $model = new \Gems_Model_JoinModel('config', 'gems__radius_config', 'grcfg');
         $model->setIfExists('grcfg_ip', 'label', $this->translate->_('IP address'), 'required', true);
         $model->setIfExists('grcfg_port', 'label', $this->translate->_('Port'), 'required', true);
         $model->setIfExists('grcfg_secret', 'label', $this->translate->_('Shared secret'), 'description', $this->translate->_('Enter only when changing'), 'elementClass', 'password', 'required', false, 'repeatLabel', $this->translate->_('Repeat password'));
         $type = new \Gems_Model_Type_EncryptedField($this->project, $valueMask);
         $type->apply($model, 'grcfg_secret', 'grcfg_encryption');
         $this->_configModel = $model;
     }
     return $this->_configModel;
 }