I use a java application that can synchronise external events from iCal file (google calendar for exemple). I would ask,
If Oracle convergence provides iCal file for all user events? Or we have only caldav protocal?
With caldav protocal can i make filters (start date, end date, ..) in my request to "firstname.lastname@example.org/calendar/"?
Right - CalDAV allows for time range filtering. See https://tools.ietf.org/html/rfc4791#section-7.4
Now, if you are looking for something that is closer to iCal subscription (simple HTTP GET request versus of HTTP REPORT in the case of CalDAV), you can use instead the WCAP protocol. See https://docs.oracle.com/cd/E63133_01/doc.80/e63138/cs_wcap_commands.htm#CSVDV185