If you see on your device, it means LaMetric lost Wi-Fi, it may happen when the device was moved to another place.
Open LaMetric application on your smartphone, tap on the same image on the screen then click on Setup and begin configuration process.
Please make sure your network is supported by LaMetric.
Wait until LaMetric is configuring. It is ready for use!
Detailed instructions you can also find in User Guide (Section 4.Configuration via the application).