the logs in my initial post are collected by following the howto you provided. including the VERBOSE settings.
Assuming that you use a recent DAVdroid version – did you
setprop log.tag.Wire VERBOSE and
setprop log.tag.HttpClient VERBOSE in the adb shell? If you do, the whole network traffic will be logged which will be helpful in debugging this issue.
What do you mean by Resource file name being an encoded URL? What is the Resource file name? I certainly hope you mean the UID.
No, the resourcename is the file name where the VCard is stored (file name in the URL, of course it may be a database entry too). A VCard may be stored in
your.collection/my.file.name.vcf and still have an UID of 12345. Often, the filename is UID.vcf, but that’s not a requirement.
In your case, the file name is
https%3A%2F%2Fsmoe%2540geruechtekueche.de%40cal.geruechtekueche.de%2Fsmoe%2540geruechtekueche.de%2Fadressen%2F592DA267-54FD6CDF-35723803.vcf.vcf, but the UID may be something other (I can’t see the UID without verbose logs).