Amazon has now found a solution and fixed the problem. 🙂
Everything is working again and 1.0.5 is available in Amazon Store!
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?