We have written a module to add CalDAV/CardDAV support to Dolibarr CRM software based on SabreDAV 3.0.8
A user encounter a problem when creating a new event on his iPhone (7), the event is correctely created on CRM, return to iPhone calendar with the right UUID (containing Dolibarr event id) but original event is still present on iPhone. So we have a duplicate event on iPhone.
This problem does not occur with Thunderbird/lightning or DAVDroid client.
I suppose there something wrong in my CalDAV backend implementation but I don't know what.
Is there someone to help me ?
Here is the source : https://github.com/Befox/cdav/blob/master/class/CalDAVDolibarr.php