Our project also includes an app for Android/iOS. It was build on Android Studio and Visual Studio (using Xamarin). We used java and C#.

The Wristband app is responsible for taking data from our server (actually, server sends data to app), and, alert family by sending a push notification, I will talk about it.

App sends an alert in case of:

1. Huge variation on heartbeats.

2. When temperature is too high for human's wrist.

3. If wristband's user falls.

4. Batery is dead.