There is no fee to stream Rockbot via the SONOS controller.
However, all actions related to your music - start, stop, skip, ban - will need to take place within the SONOS system.
Optional SONOS Monthly Add-On
Starting in January 2020, customers will have the option to add "Sonos Support" to their subscription for $4/month. Customers with this feature will be able to control their Sonos player from the Rockbot Remote App and/or the Rockbot Web Dashboard.