无人机下线不删除payload表。

sample/src/main/java/com/dji/sample/manage/service/impl/DevicePayloadServiceImpl.java

@@ -139,6 +139,12 @@ public class DevicePayloadServiceImpl implements IDevicePayloadService {
      * @param payloads
      */
     public void updatePayloadControl(DeviceDTO drone, List<DevicePayloadReceiver> payloads) {
+        // 检查设备是否在线，不在线则不更新payload，避免异常离线导致数据丢失
+        if (!deviceRedisService.checkDeviceOnline(drone.getDeviceSn())) {
+            log.warn("Device {} is offline, skipping payload update.", drone.getDeviceSn());
+            return;
+        }
+
         boolean match = payloads.stream().peek(p -> p.setSn(Objects.requireNonNullElse(p.getSn(),
                 p.getDeviceSn() + "-" + p.getPayloadIndex().getPosition().getPosition())))
                 .anyMatch(p -> ControlSourceEnum.UNKNOWN == p.getControlSource());