adding notifications on connection issues

sails/src/assets/scripts/modules/student/controllers/student.js

@@ -56,6 +56,13 @@ dashboardControllers.controller('StudentCtrl', function StudentCtrl(
     }
   });
 
+  io.socket.on('disconnect', function () {
+    $scope.studentData.pcb_count = 0;
+    $scope.studentData.pdb_count = 0;
+    $scope.$apply();
+    ngToast.warning($translate.instant('no_subscribed'));
+  });
+
   io.socket.on('reconnect', function () {
    // Subscribe to student's socket room
     io.socket.post('/stu/subscribe', {
@@ -67,7 +74,7 @@ dashboardControllers.controller('StudentCtrl', function StudentCtrl(
       token: $window.sessionStorage.token
     },
     function () {
-      // TODO ngToast res.msg (connected to student room)
+      ngToast.warning($translate.instant('subscribed'));
     });
   });