Custom Message Service adapter

Hi,

anybody knows where can I find some serious documentation about how to create custom message service adapters?
I tried the sample from the lcds dev guide, it works fine, but i need to use subscription handling, but not found it anywhere how to realize one...
Can anybody point me where can i find one, or how to do this?

I already override the handlesSubscriptions(), and manage() methods. The manage() is being called, but dont know what to do there...

Thanx