Hello everyone, these days I had an emergency and I couldn't contact people, from here I got an idea that could be interesting. Is it possible to create an application (even a very basic one) that sends a warning to a database via a click which, receiving this warning, makes a sound emit to a stereo system in the house, so as to warn that there is a problem? I'm talking about databases but if you have other ideas please write as well. Another thing, if this is not possible, can you send an alert / sms to all people with this application installed on your mobile, or to fixed predefined numbers?. Thanks guys, sorry for the question perhaps a bit strange.