Smart View SDK

Smart View SDK let your mobile communicate and control your Samsung Smart TV and Audio and facilitate application development for devices based on iOS, Android and JavaScript. The Mobile device once connected, can communicate with your TV through the Smart View Framework

Wireless Speaker Support with the Smart View SDK
https://developer.samsung.com/smarttv/develop/extension-libraries/smart-view-sdk/supported-device/wireless-speaker.html

NOTE: I'm not aware of any app that supports the Multiroom speakers. Please let us know if you found any. (moosylog@gmail.com)