FWIW, if you don't need hardware, you can turn your phone into such a "button". Apps allow you to add a widget to your home screen and can be configured to make

FWIW, if you don't need hardware, you can turn your phone into such a "button". Apps allow you to add a widget to your home screen and can be configured to make HTTP requests. https://play.google.com/store/apps/details?id=ch.rmy.android.http_shortcuts https://play.google.com/store/apps/details?id=ch.rmy.android...