Depends if it's bluetooth or wifi. If it's bluetooth use a computer or laptop with bluetooth. If it's wifi it just has to be on the same network. But it has to be on and not sleeping. Install an Android emulator on the computer (Android Studio, Bluestacks, Genymotion, whatever), install the Anova app onto it, set it up to talk to the unit.
Then set up your preferred remote access app. If you use Chrome you can use Chrome Remote Desktop. There's always VNC and its varients, Splashtop, many more. Use that to access your computer from wherever, to access the Android emulator, to access the unit.