Добавил еще одно устройство в проект: HART модем, получающий накопленный расход от расходометра.

logs_service/views.py

@@ -10,16 +10,30 @@ from .apps import LogsServiceConfig
 @permission_required(perm='logs_service.view_mbtankrecord', raise_exception=True)
 def view_stats(request):
     print(f"Executing view_stats in process with pid={os.getpid()}")
-    tank = MbTankRecord.load_stats()
+
+    # данные резервуара
+    tank = {}
+    if request.user.has_perm('logs_service.view_mbtankrecord'):
+        if LogsServiceConfig.mb_pump_service is not None and LogsServiceConfig.mb_pump_service_enable:
+            tank = MbTankRecord.load_stats()
+
+    # данные насосной
     pump = {}
     if request.user.has_perm('logs_service.view_pump_stats'):
         if LogsServiceConfig.mb_pump_service is not None and LogsServiceConfig.mb_pump_service_enable:
             pump = LogsServiceConfig.mb_pump_service.get_stats()
 
+    # данные HART-модема, он же расходометр
+    hart = {}
+    if request.user.has_perm('logs_service.view_accumulated_flow'):
+        if LogsServiceConfig.mb_hart_service is not None and LogsServiceConfig.mb_hart_service_enable:
+            hart = LogsServiceConfig.mb_hart_service.get_stats()
+
     out = {
         'stats': {
             'tank': tank,
-            'pump': pump
+            'pump': pump,
+            'hart': hart
         }
     }
     response = HttpResponse(json.dumps(out))