Use ServerUplinkConnetor.broadcast() instead of local helper

lib/tfw/event_handler_base.py

@@ -131,16 +131,9 @@ class BroadcastingEventHandler(EventHandlerBase, ABC):
         response = self.dispatch_handling(message)
         if response:
             self.own_message_hashes.append(self.hash_message(response))
-            self.server_connector.send(self.make_broadcast_message(response))
+            self.server_connector.broadcast(response)
 
     @staticmethod
     def hash_message(message):
         message_bytes = dumps(message, sort_keys=True).encode()
         return md5(message_bytes).hexdigest()
-
-    @staticmethod
-    def make_broadcast_message(message):
-        return {
-            'key': 'broadcast',
-            'data': message
-        }