add rancher statistics to inventory entries list - fix bug of login for empty string device identity

apps/pos_device/pos/api/v1/urls.py

@@ -1,8 +1,10 @@
 from django.urls import path, include
 from rest_framework.routers import DefaultRouter
+from .viewsets import device
 
 router = DefaultRouter()
 
 urlpatterns = [
-    path('v1/', include(router.urls))
+    path('v1/', include(router.urls)),
+    path('test_webserver', device.test_web_server, name='test_web_server'),
 ]