添加获取这个智能体设备理的最近的最后连接时间定义和实现

--DeviceService.java 方法定义
--DeviceServiceImpl.java 方法实现

main/manager-api/src/main/java/xiaozhi/modules/device/service/DeviceService.java

@@ -1,5 +1,6 @@
 package xiaozhi.modules.device.service;
 
+import java.util.Date;
 import java.util.List;
 
 import xiaozhi.common.page.PageData;
@@ -78,4 +79,13 @@ public interface DeviceService extends BaseService<DeviceEntity> {
      * @return 激活码
      */
     String geCodeByDeviceId(String deviceId);
+
+    /**
+     * 获取这个智能体设备理的最近的最后连接时间
+     * @param agentId 智能体id
+     * @return 返回设备最近的最后连接时间
+     */
+    Date getLatestLastConnectionTime(String agentId);
+
+
 }

main/manager-api/src/main/java/xiaozhi/modules/device/service/impl/DeviceServiceImpl.java

@@ -1,12 +1,7 @@
 package xiaozhi.modules.device.service.impl;
 
 import java.time.Instant;
-import java.util.Date;
+import java.util.*;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.TimeZone;
-import java.util.UUID;
 
 import org.apache.commons.lang3.StringUtils;
 import org.springframework.stereotype.Service;
@@ -258,6 +253,12 @@ public class DeviceServiceImpl extends BaseServiceImpl<DeviceDao, DeviceEntity>
         return null;
     }
 
+    @Override
+    public Date getLatestLastConnectionTime(String agentId) {
+        List<Date> list = deviceDao.getAllLastConnectedAtByAgentId(agentId);
+        return Collections.max(list, Comparator.comparing(Date::getTime));
+    }
+
     private String getDeviceCacheKey(String deviceId) {
         String safeDeviceId = deviceId.replace(":", "_").toLowerCase();
         String dataKey = String.format("ota:activation:data:%s", safeDeviceId);