I'm looking at my options to control the Sonos Port at https://developer.sonos.com/reference/. I read about some UPnP control of other Sonos devices, but I can't seem to find any official information about this online. Is UPnP control of the Sonos Port possible?
Sonos uses UPnP for some calls internally, but we never publicly supported this protocol. We encourage you to use the Control API to control Sonos devices. See Connected Home: Get Started for details. Let us know if you see anything missing that you'd like us to add.