Now I know why my wifes insulin pump's (Medtronic) Android app doesn't support setting the bolus and only allows observation :D

It's likely better that way. If the app would allow this, I'd already decompiled the app and tried to reverse engineer the protocol to allow her to set a bolus when she's wearing something that makes it hard to access the pump or carry her phone with her (like a dress). Setting the bolus via e.g. a smartwatch would be really nice, but I'd be very afraid of creating a life-threatening bug.