Synchronisation from within calendar app does nothing

[ygoe]

Hello,

I noticed that calendar apps have their own synchronisation button somewhere, and Davx5 also has one in its own UI, besides its configured sync intervals. I read up in the manual that those in-app sync buttons should trigger an immediate synchronisation. I understand that as the same result as if I press the sync button within Davx5.

But that's not the case. I've never observed any content to be actually synced when using a button in a calendar app. I always needed to open Davx5 manually and trigger a sync there.

Is this a bug?

I have the latest versions of all apps, running on Android 12 on a Samsung S10e.

I intend to write my own calendar app for Android and Windows because I'm unsatisfied with what's out there, even paid versions. As part of that I'm also thinking about establishing an auto-sync feature that notifies subscribed clients of new changes on a server pushed by another client. This would be implemented in the calendar app because I have no control over Davx5. But for this to work, the app must be able to tell Davx5 to start a sync.

[rfc2822]

Works without problems here (Samsung Calendar). The calendar app requests a sync from the system sync framework, which passes the request to DAVx5, which starts a sync.

You can have a look at the system logs to see more information. Which calendar app are you using?

As part of that I'm also thinking about establishing an auto-sync feature that notifies subscribed clients of new changes on a server pushed by another client.

We're currently working on Push for CalDAV, too.

[ygoe]

Not with Google Calendar and not with Samsung Calendar. Seems to be unstable at least if it only works on some devices...

Still reading on the push thing. The most interesting question will be which system is used (WebSocket, Google FCM, etc.). Especially PHP applications (like Nextcloud or Baikal are) cannot provide a WebSocket directly, so that would require an external service.

[ygoe]

I found the debug log option and enabled it. While testing, I waited a bit longer and suddenly my changes were displayed on the device. I repeated this and found that it takes a whole 40 seconds after the sync completion for calendar changes to appear in the app. When syncing directly from within Davx5, it happens immediately when returning to the calendar app. Sync duration is always around 4 seconds. (Google Calendar doesn't tell me when it's done which is another bad decision they took.)

Is that normal? Do I always have to wait almost a minute before I can proceed?

Where can I retrieve the written log file? I couldn't find any files in the file system.

[rfc2822]

Is that normal? Do I always have to wait almost a minute before I can proceed?

Depends on system settings that DAVx5 can't influence. If you use the button in the calendar app, the Android sync framework is used to pass the request to DAVx5, and it may take some time. Most times it is fast, but there may be conditions that withhold the sync a bit (or even longer).

Where can I retrieve the written log file? I couldn't find any files in the file system.

You can tap the notification and then "View logs" in the Debug info screen. The logs are written to a DAVx5 private directory because they contain sensitive information – other apps can only access the logs when you share them over the Debug info screen.