The cause for this problem has finally been identified. Please follow up at https://github.com/ge0rg/MemorizingTrustManager/issues/52
since a few days (probaly mid of January) the sync on my smartphone does not work anymore. It’s just the synchronization that fails. Before that, it worked liked a charm for many years.
If I start a sync manually, no icon appears in the notification bar, there is no entry in the log files - neither in DAVx5 nor on the radicale server.
All permissions are granted, the addressbooks/calendars are detected (in DAVx5) and I can create new ones.
I removed the app an re-installed it but nothing changes. After the re-install, the calendars/addressbooks appear in DAVx5 but not in the system apps.
This is the configuration: https://pastebin.com/U0M3GxZ9
(It’s Xiaomi Redmi3s phone, using MIUI 10 Global 9.3.28)
And this is the log: https://pastebin.com/5TZvnLZf
(I re-read the calendars from the server. For the sync there is no entry.)
Thank you for your help.
Did you do all the Xiaomi energy-saving and permission (autostart) settings?
Yes, I did check these permissions. They are all set properly.
What just came to my mind: A few days ago, I deactivated the phone sync (I mean this android option for accounts) and re-activated it a few days later. Perhaps, the error occurs since then.
Ok, I solved the problem.
It wasn’t related to DAVx5 but to MIUI. Looking in the synchronization options I realized that no account (google, …) had been synced for many days. And I manual sync did not work at all. I re-installed the latest MIUI version (via Options -> About the phone -> System-Update, In case anybody has the same problem) and now it works again.