Ok, I found out what my problem was with the PS3 not being able to see PMS.
In my debug.log the following error message appeared:
unexpected io error class java.net.unknownhostexception
This is an error where java cannot resolve the ip of the hostname, so you have to set that in /etc/hosts
In my case I added the line:
10.0.0.2 ginette ginette
Now I have a whole bunch of new problems, so i still can't play anything, but at least i have a connection.
Hope this helps anyone.