Display status in admin console, Change the filters to include relevant fields, scopes for device status

config/environments/development.rb

@@ -39,4 +39,8 @@ Rails.application.configure do
   # Raises error for missing translations
   # config.action_view.raise_on_missing_translations = true
   HEARTBEAT_INTERVAL = 1.minute
+
+  ACTIVE_TIMEFRAME = 1.hours
+  MISSING_TIMEFRAME = 2.hours
+
 end