GNUstep Objective-C based CalDAV server

[Andreas Höschler]

Hi all,

we have an Objective-C based database application running on GNUstep. The 
database stores calendar events (appointments, meetings, memos,...) beside many 
other business objects.

We need to somehow sync the iPhone Calendar of users with our proprietary 
database. What we probably need to develop is an Objective-C based service that 
connects to our database on one side and behaves as a CalDAV server on the 
other side.

        iPhone ----> Objective-C based service (CalDAV server implementation) 
----> our proprietary RDBMS

Has anyone already done something like that (Objective-C based CalDAV server)?

Hints to documentation, projects, existing libraries or frameworks are greatly 
appreciated?

Thanks a lot,

 Andreas