I’m wondering if it’s feasible to use another iOS device as the trigger. Perhaps StageCaller is trying to kill a fly with a rocket launcher, but for simple uses (class exercises in my case) it’d be great to have the app on two phones and have one trigger another.
Ideally an iPhone could create an ad-hoc network with another, but I’m fairly sure that’s not possible. But perhaps Bluetooth could be a good peer-to-peer connection for smaller spaces.
Maybe this is a separate “Lite” app.