Rated 1 out of 5 stars

A CardDAV SOGo Link looks like this

https://<url>/SOGo/dav/<username>/Contacts/personal/

It can be set up to look like this

https://<url>/dav/<username>/Contacts/personal/

If I insert the link in the browser I still bet error

This review is for a previous version of the add-on (4.0). 

Thank you for trying my extension.

Unfortunately SOGo Server is NOT compliant with the CardDAV standards published by the IETF and so can not be considered a CardDAV server despite their claim.

I do list SOGo Server as unsupported on my AddOn's page and provide a link to give more information about the issue. The only way that SOGo will be supported is if they make their system compliant with the appropriate IETF standards. I can only suggest that you contact SOGo (https://sogo.nu/) directly and ask them to make their system standards compliant.

Thank you.

Rated 1 out of 5 stars

I added the URL and click connect and I get the following
"CardDAV server did not return any data."
That's all I can say :)

UPDATE 2017.02.02
SOGo is the only Groupware that works in a way it can be used in production. If you have found out the differences, it would be nice if you also make a version for SOGo.

But you are right, CardDAV is so buggy on most devices I can hardly imagine one of the developers can fix it. Its buggy on android, its buggy on Apple, Its buggy on Windows.

The only opensource CardDAV that works is SOGo. You are not compatible.
The only closedsource CardDAV that works is the one on Google. But again your not compatible to it.

What left?

This review is for a previous version of the add-on (3.0). 

Thank you for trying this add-on. I'm sorry to hear that you haven't been able to connect to SOGo with it and, if you would like to contact me with further details, I would be happy to investigate the issue.

The response "CardDAV server did not return any data" means 1 of 2 things:
1) There are no contacts in the address book to display, or
2) The URL you used links to a CardDAV server but not to an address book.