SMS sending through the SMS gateway present on hetzner.de hosting accounts.
The API is designed to allow the component to be used as a drop-in replacement for the BulkSMS-based sending component initially developed by Alexander Emelyanov.
I am in no way affiliated with hetzner.de, and this component is not officially supported by hetzner.de. It merely implements the gateway as described in their documentation: https://wiki.hetzner.de/index.php/KonsoleH:SMS-Versand