优化设备状态保持，自动记录心跳间隔，三次心跳失败则设备离线，不在使用设备有效期字段作为唯一判断标准，提高容错能力和稳定性。

src/main/java/com/genersoft/iot/vmp/gb28181/bean/Device.java

@@ -94,6 +94,13 @@ public class Device {
 	@Schema(description = "心跳时间")
 	private String keepaliveTime;
 
+
+	/**
+	 * 心跳间隔
+	 */
+	@Schema(description = "心跳间隔")
+	private int keepaliveIntervalTime;
+
 	/**
 	 * 通道个数
 	 */
@@ -413,4 +420,12 @@ public class Device {
 	public void setLocalIp(String localIp) {
 		this.localIp = localIp;
 	}
+
+	public int getKeepaliveIntervalTime() {
+		return keepaliveIntervalTime;
+	}
+
+	public void setKeepaliveIntervalTime(int keepaliveIntervalTime) {
+		this.keepaliveIntervalTime = keepaliveIntervalTime;
+	}
 }

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

@@ -1,5 +1,7 @@
 package com.genersoft.iot.vmp.gb28181.transmit.event.request.impl.message.notify.cmd;
 
+import com.genersoft.iot.vmp.common.VideoManagerConstants;
+import com.genersoft.iot.vmp.conf.DynamicTask;
 import com.genersoft.iot.vmp.conf.UserSetting;
 import com.genersoft.iot.vmp.gb28181.bean.Device;
 import com.genersoft.iot.vmp.gb28181.bean.ParentPlatform;
@@ -43,6 +45,9 @@ public class KeepaliveNotifyMessageHandler extends SIPRequestProcessorParent imp
     @Autowired
     private UserSetting userSetting;
 
+    @Autowired
+    private DynamicTask dynamicTask;
+
     @Override
     public void afterPropertiesSet() throws Exception {
         notifyMessageHandler.addHandler(cmdType, this);
@@ -68,6 +73,13 @@ public class KeepaliveNotifyMessageHandler extends SIPRequestProcessorParent imp
             device.setHostAddress(remoteAddressInfo.getIp().concat(":").concat(String.valueOf(remoteAddressInfo.getPort())));
             device.setIp(remoteAddressInfo.getIp());
         }
+        if (device.getKeepaliveTime() == null) {
+            device.setKeepaliveIntervalTime(60);
+        }else {
+            long lastTime = DateUtil.yyyy_MM_dd_HH_mm_ssToTimestamp(device.getKeepaliveTime());
+            device.setKeepaliveIntervalTime(new Long(System.currentTimeMillis()/1000-lastTime).intValue());
+        }
+
         device.setKeepaliveTime(DateUtil.getNow());
 
         if (device.getOnline() == 1) {
@@ -75,9 +87,15 @@ public class KeepaliveNotifyMessageHandler extends SIPRequestProcessorParent imp
         }else {
             // 对于已经离线的设备判断他的注册是否已经过期
             if (!deviceService.expire(device)){
+                device.setOnline(0);
                 deviceService.online(device);
             }
         }
+        // 刷新过期任务
+        String registerExpireTaskKey = VideoManagerConstants.REGISTER_EXPIRE_TASK_KEY_PREFIX + device.getDeviceId();
+        // 如果三次心跳失败，则设置设备离线
+        dynamicTask.startDelay(registerExpireTaskKey, ()-> deviceService.offline(device.getDeviceId()), device.getKeepaliveIntervalTime()*1000*3);
+
     }
 
     @Override