Feedback TO the phone App.

Has anyone found a way to "update" the controls on the phone app when the arduino sketch changes a setting ?

An example : I am trying to make RemoteXY do a mode-change on a loudspeaker selection panel that already has local, physical pushbuttons.  I would like the RemoteXY app to reflect the local changes to mode selection on its "Select" control.

I thought that I might be able to set the value of the control, and do a RemoteXY_Init(), but that doesn't work.

Surely the app should always be reading back what the control has set in the sketch, not just blindly display what it "thinks" it has set ??