• Default: <empty>

  • Values: String

The configuration value is the name of the driver, optionally followed by an : and driver-specific options (see Push Notification Framework for the list of drivers and options supported).

It is possible to specify multiple push notification drivers by adding a sequential number to the push_notification_driver label, starting with the number 2. There can be no numbering gaps for the labels; only the drivers that appear in sequential order will be processed.