Its nice to have a BRAT TIMER that already knows the GRILL STEPS.
Simmer - Pre-heat Grill (while simmer finishes) -- Brown
Start simmering your brats.
Start the timer.
When its time, be reminded to start the grill pre-heat (while the simmer finishes).
The app reminds you as each step completes.
You can tweak the time for each step before you start, or on-the-fly. Whatever changes you make will be remembered for next time.