Ipad for Sonos Controller Class

Hello, I need a class to control a Sonos Sound System for my self written private home automation software . I all ready started this project based on the upnx framework, which worked very well for controlling an browsing, but i had problems to subscribe to multiple events.... Needed features: discover Sonos zones subscribe to all sonos zone events and store the information for each zone browse Sonos music library Queue management Groupe management Volume control. I`ll provide more details to candidate.