Project has been very useful for decade or so.. But as there seems to be no plans to implement support for Apples new API, it's probably better start archiving it. Anyway Apple is closing down the legacy provider in March/2021.
https://developer.apple.com/documentation/usernotifications/setting_up_a_remote_notification_server/sending_notification_requests_to_apns?language=objc
APNs will not support legacy binary protocol as of March 31, 2021. We recommend updating to the HTTP/2-based API from this page as soon as possible.