Yes, adb shell works.

 

A keyboard would not help, you can't focus the area I need with the arrows. You need a mouse. It is also impossible to connect a Bluetooth mouse on the Fire TV stick (only on the regular Fire TV [1]).

 

This is their smartphone app, it does not give you better control of the UI, it is just a virtual remote.

 

So I guess the correct intent would be com.wireguard.android.action.SET_TUNNEL_UP, but I guess I need to provide the name of the interface as a payload? Thanks for the pointer, I'll dig in the code to see how the payload needs to be provided.

[1]: https://www.amazon.com/gp/help/customer/display.html?nodeId=201739960 "You cannot connect a keyboard or mouse to Fire TV Stick."