The device uses this property to determine how many days before a certificate expires it should start notifying the host that it is about to expire. If the value is set to 0, the notification will be disabled.
The notification will only be sent if TLS is enabled, and the notification will only be sent for they server certificate that the device is configured to use. The notification will be sent every time the first client connects to the device shortly after it connects.
Notification 0x1001 - Device Information Update category Key management, reason Certificate Expiring Soon is related.