Closing because of missing user response.
[DID YOU KNOW] that you can restrict sync of DAVdroid even to a single WiFi SSID?
In your DAVdroid account, choose settings and enter the name of your Wireless Lan Network (the SSID) in the field. DAVdroid will then only trigger a sync if your device is connected to this specific network.
@devvv4ever I’m currently using this feature to limit synchronization to the local network, otherwise I get a lot of certificate warnings from e.g. captive portals.
However, I can also VPN into my local network using some other network. I’d like DavDroid to synchronize in such situations as well. Is this doable?