Just tested Command Fastrack switches (I don't have an ASC2 currently connected) using the Lionel LCS App with WiFi in No Base mode. The App connects and can throw switches (on screen). My WiFi was joined to the office network so that option works in No Base mode.
Even if you have Command switches, you will need the ASC2. The switches need the TMCC track signal to work, so an ASC2 will deliver the throw signals.
Add a STM2 to provide position feedback from the switches to the App.