Baïkal

DAVdroid has been successfully tested with Baïkal.

Baïkal is a lightweight CalDAV + CardDAV server, based on SabreDAV.

DAVdroid settings

Base URL: /dav.php/ (e.g. https://server.example/baikal/dav.php/)

Contact group method: groups are separate VCards (or the method used by your other clients)