old_contents: from django.apps import AppConfig
  
  
  class ModelSmsAppConfig(AppConfig):
      name = 'ievv_opensource.ievv_sms'
      verbose_name = "IEVV SMS"
  
      def ready(self):
          from ievv_opensource.ievv_sms import sms_registry
          from ievv_opensource.ievv_sms.backends import debugprint
          registry = sms_registry.Registry.get_instance()
          registry.add(debugprint.Backend)
          registry.add(debugprint.Latin1Backend)
  
new_contents: from django.apps import AppConfig
  
  
  class ModelSmsAppConfig(AppConfig):
      name = 'ievv_opensource.ievv_sms'
      verbose_name = "IEVV SMS"
  
      def ready(self):
          from ievv_opensource.ievv_sms import sms_registry
          from ievv_opensource.ievv_sms.backends import debugprint
          from ievv_opensource.ievv_sms.backends import pswin
          registry = sms_registry.Registry.get_instance()
          registry.add(debugprint.Backend)
          registry.add(debugprint.Latin1Backend)
          registry.add(pswin.Backend)
  
subject: Add pswin backend to registry.