src/main/java/com/genersoft/iot/vmp/gb28181/transmit/callback/DeferredResultHolder.java
@@ -51,6 +51,8 @@
   public static final String CALLBACK_CMD_BROADCAST = "CALLBACK_BROADCAST";
   public static final String CALLBACK_CMD_SNAP= "CALLBACK_SNAP";
   private Map<String, Map<String, DeferredResultEx>> map = new ConcurrentHashMap<>();