This tutorial describes how to set up Android Calendar and Contacts to use DAVdroid to synchronize data with a Radicale CalDAV/CardDAV server running on GNU/Linux. The steps use Free Software, do not use or share your data with external service providers, and work with the stock "non-rooted" Android image.

The final solution enables wireless network synchronization of calendar and contact data between an Android device and a GNU/Linux computer.