feat: 二代灯有count数据则返回，否则用一代数据

apps/counter/api/serializers.py

@@ -32,6 +32,7 @@ def get_device_latest_by_cache(device_id, key="device_latest_{}"):
     latest = cache.get(latest_key)
     if latest:
         return latest
+
     latest = DeviceCount.objects.filter(device_id=device_id).order_by('-data_time').first()
     if latest is None:
         return None
@@ -235,6 +236,13 @@ class DeviceInfoSerializer(serializers.ModelSerializer):
 
     def get_count(self, obj) -> str:
         self.latest = get_device_latest_by_cache(obj.device_id)
+
+        # 区分一代和二代设备
+        if obj.chip_type == 'AIR-V2':
+            mosq_device_info = MosquitoDeviceInfo.objects.filter(device_id=obj.device_id).first()
+            if mosq_device_info and mosq_device_info.count:
+                return mosq_device_info.count
+
         if self.latest:
             return self.latest['count']
         return '0'