To refresh your Devices, Routines, Favorites, User, or any other data in the Yonomi app, just do a "pull-to-refresh" action on any content page in the app.
This should work on most pages on the Dashboard, Accounts & Hubs, and in the Device pages.
To do so, just start dragging your finger down from the top of the screen until a refresh icon appeaers, and then release it once it stops descending.