Is true Two-Way synchronization possible ?

[karlitos]

Hello

I tried to find out how the synchronization over CalDAV/CardDAV works, but I am still a bit confused. I would like to know, if I can sync the calendar and contacts on my desktop computer and mobile phone in the same way, like for example the exchange or SncML synchronization works.

My mobile phone is not connected to the internet the whole time. What happens, if I create a new contacts or appointements independent on booth sides - the own cloud and the mobile phone and then go online with the mobile phone ? Or is it more like that the remote calendar is working only if the client is online ?

Thank you in advance for an explanation - K

[Vathek]

Are you talking specifically about what happens if you've changed or created an event offline on both desktop and mobile and then they both go online? If I'm not mistaken, this is handled in the clients, i.e. you can tell your phone whether it or the server has priority. I've never run into any problems here and apart from that, yes it's true 2-way sync and has been working flawlessly for me using the needed additional apps on Android and Thunderbird/Lightning on the desktop side.

[karlitos]

Thanks for the reply. So if I do understand it right, if I set a remote calendar on two clients (notebook, desktop) under - lets say Thunderbird - and create a new appointement on the laptop, go online LATER and more later turn on my desktop - the appointement will be synced on the desktop ?

I checked some How-To's related to CalDAV and Thunderbird and but I am not sure what happens, if the client is off-line. and you want to edit the network calendar. This report says it is not possible Did not find any signs of a SYNC NOW function or something relevant.

Probably I have to try it on my own to see how good this works.

[Vathek]

Thanks for the reply. So if I do understand it right, if I set a remote calendar on two clients (notebook, desktop) under - lets say Thunderbird - and create a new appointement on the laptop, go online LATER and more later turn on my desktop - the appointement will be synced on the desktop ?

Yes this works just fine. Maybe Lightning has evolved since that report you linked in 2010? I'm using the latest version of Thunderbird, Lightning and the nightly of the SoGo connector and with this setup I can turn WiFi off, work offline, create or edit events and they get synced immediately as soon as there is an internet connection again.

You can set the sync interval for each calendar in Lightning or have it only sync manually. When you right click on a calendar there is an option called 'reload remote calendars'. So when these new/edited events would show up on your desktop depends on those settings, but the upload to the server happens immediately as soon there is a connection.