Synology DiskStation Manager (DSM) is a Linux based software package that is the operating system for Synology's DiskStation and RackStation products. A CalDAV server is available in the base system. CardDAV can be installed as an extra package. It's also possible to run other CalDAV/CardDAV software like Baïkal and ownCloud on Synology systems. In this case, see the respective configuration pages for details.
The Calendar package provides a calendar with Web and CalDAV interface.
You can view the CalDAV URL in the Calendar Web interface (Calendar > CalDAV Account). Use the macOS / iOS URL, but you may have to replace
/caldav.php/ (bug report).
So, the CalDAV Base URL could look like this:
The CardDAV Server package provides a CardDAV server with address book backend in the Web interface.
CardDAV Base URL:
User name and password: same as for Synology DSM
Contact group method: groups are separate VCards
If you're accessing a newly created calendar/task list, Synology returns 404 Not Found when this collection is queried by DAVdroid. To work around this, add an event and a task to the calendar (e.g. with DAVdroid). Then synchronize and the 404 error should be gone.