I don't foresee an issue for your app. There are quite a few apps that cast content into Roku and that is most welcome, there are remote control apps... see
https://sdkdocs.roku.com/display/sdkdoc ... ontrol+API (in addition, the apps can communicate by other network means, http/tcp/udp).
Here is one published 3rd party app that comes to mind that even
requires an external companion app -
https://channelstore.roku.com/details/8 ... arty-games - it is a game, for which participants have to download Android app which lets them use the phone as a touch-pad controller.
The "no internal nesting" rule - as i personally understand it - is different, against publishing "empty shell" apps with misleading behavior or high potential for copyright abuse/violations, like loading completely different app, "theft of services" etc