Troubleshooting connection to sensor
If the sensor and app don't seem to be connecting:
1. Close the app on the phone.
Make sure you don’t just exit the app but that the app is actually closed:
On iPhone, double-press the Home button and swipe the app up to the top of the screen.
On Android, tap on the Tasks hardware button (typically to the left of the Home button) and swipe the app to the side of the screen.