I currently have a pentair control panel inside the house that controls the entire pool pump, spa, solar , heater and it is connected to a pentair I9+3 out by the pool equipment.

I would like to be able to control all of these features over a web app on my phone.
what do i have to do to achieve that ?

I would like to be able to control all of these features over a web app on my phone.
what do i have to do to achieve that ?