I am a newbie of Sonos community. I am really enjoy Sonos speakers that I just bought, now I want to develop a small tool (Android app + Google extensions) to control the Sonos locally. I took a look at the Sonos developer page, I couldn’t find any documents about controlling the speakers locally. All I found is control the speakers from the cloud which I don’t need. I heard people mention that Unpn can control the speakers locally, but I cannot find any information about that protocol from Sonos websites. I just want to ask our community if you can give me more info where do I start to write a small tool to control the speakers?