平台保活消息增加回复200OK

src/main/java/com/genersoft/iot/vmp/gb28181/transmit/event/request/impl/message/notify/cmd/KeepaliveNotifyMessageHandler.java

@@ -109,7 +109,11 @@ public class KeepaliveNotifyMessageHandler extends SIPRequestProcessorParent imp
 
     @Override
     public void handForPlatform(RequestEvent evt, ParentPlatform parentPlatform, Element element) {
-        // 不会收到上级平台的心跳信息
-
+        // 个别平台保活不回复200OK会判定离线
+        try {
+            responseAck((SIPRequest) evt.getRequest(), Response.OK);
+        } catch (SipException | InvalidArgumentException | ParseException e) {
+            logger.error("[命令发送失败] 心跳回复: {}", e.getMessage());
+        }
     }
 }