public function sendMessage()
 {
     if (Yii::$app->request->isAjax) {
         $post = Yii::$app->request->post();
         if (isset($post['id']) && $post['id'] > 0) {
             $station = Station::findOne($post['id']);
             $ip = $station['ip'];
             $port = $station['port'];
             if ($ip != '' && $port != '') {
                 $client = new Client();
                 $init = $client->init($ip, $port);
                 if ($init) {
                     $send = $client->send($post['message']);
                     if ($send) {
                         print $client->returnMessage;
                     } else {
                         print $client->error;
                     }
                 } else {
                     print $client->error;
                 }
             }
         }
     }
     print 'failed';
 }