diff --git a/backend/src/uxbox/http/ws.clj b/backend/src/uxbox/http/ws.clj
index 64e17f43e..3577ea192 100644
--- a/backend/src/uxbox/http/ws.clj
+++ b/backend/src/uxbox/http/ws.clj
@@ -20,11 +20,12 @@
    [uxbox.util.uuid :as uuid]
    [vertx.eventbus :as ve]
    [vertx.http :as vh]
-   [vertx.impl :as vi]
    [vertx.util :as vu]
+   [vertx.timers :as vt]
    [vertx.web :as vw]
    [vertx.web.websockets :as ws])
   (:import
+   java.lang.AutoCloseable
    io.vertx.core.Handler
    io.vertx.core.Promise
    io.vertx.core.Vertx
@@ -91,9 +92,11 @@
         ws (assoc ws
                   :user-id user-id
                   :file-id file-id)
-        sem (start-eventbus-consumer! ctx ws file-id)]
+        send-ping #(send! ws {:type :ping})
+        sem1 (start-eventbus-consumer! ctx ws file-id)
+        sem2 (vt/schedule-periodic! ctx 30000 send-ping)]
     (handle-message ws {:type :connect})
-    (assoc ws ::sem sem)))
+    (assoc ws ::sem1 sem1 ::sem2 sem2)))
 
 (defn- on-text-message
   [ws message]
@@ -106,7 +109,8 @@
   (let [file-id (:file-id ws)]
     (handle-message ws {:type :disconnect
                         :file-id file-id})
-    (.unregister (::sem ws))))
+    (.close ^AutoCloseable (::sem1 ws))
+    (.close ^AutoCloseable (::sem2 ws))))
 
 (defn handler
   [{:keys [user] :as req}]
diff --git a/backend/vendor/vertx/src/vertx/eventbus.clj b/backend/vendor/vertx/src/vertx/eventbus.clj
index 4415d276c..35238edb8 100644
--- a/backend/vendor/vertx/src/vertx/eventbus.clj
+++ b/backend/vendor/vertx/src/vertx/eventbus.clj
@@ -7,15 +7,16 @@
 (ns vertx.eventbus
   (:require [promesa.core :as p]
             [vertx.impl :as impl])
-  (:import io.vertx.core.Vertx
-           io.vertx.core.Handler
-           io.vertx.core.Context
-           io.vertx.core.eventbus.Message
-           io.vertx.core.eventbus.MessageConsumer
-           io.vertx.core.eventbus.DeliveryOptions
-           io.vertx.core.eventbus.EventBus
-           io.vertx.core.eventbus.MessageCodec
-           java.util.function.Supplier))
+  (:import
+   io.vertx.core.Vertx
+   io.vertx.core.Handler
+   io.vertx.core.Context
+   io.vertx.core.eventbus.Message
+   io.vertx.core.eventbus.MessageConsumer
+   io.vertx.core.eventbus.DeliveryOptions
+   io.vertx.core.eventbus.EventBus
+   io.vertx.core.eventbus.MessageCodec
+   java.util.function.Supplier))
 
 (declare opts->delivery-opts)
 (declare resolve-eventbus)
@@ -36,7 +37,9 @@
                                            (.resume consumer)
                                            (.reply msg (or res err)
                                                    (opts->delivery-opts {}))))))))
-    consumer))
+    (reify java.lang.AutoCloseable
+      (close [it]
+        (.unregister consumer)))))
 
 (defn publish!
   ([vsm topic msg] (publish! vsm topic msg {}))
diff --git a/backend/vendor/vertx/src/vertx/timers.clj b/backend/vendor/vertx/src/vertx/timers.clj
index 58ed526bd..ff345a4dd 100644
--- a/backend/vendor/vertx/src/vertx/timers.clj
+++ b/backend/vendor/vertx/src/vertx/timers.clj
@@ -26,7 +26,7 @@
       (close [_]
         (.cancelTimer system timer-id)))))
 
-(defn sechdule-periodic!
+(defn schedule-periodic!
   [vsm ms f]
   (let [^Vertx system (impl/resolve-system vsm)
         ^Handler handler (impl/fn->handler (fn [v] (f)))