Door sensorThe door sensor supported by Viva is supplied by Aeotec. It detects the opening and closing of doors and windows using a magnet. 
Installation of a door sensor is done by selecting Devices from the menu in the Viva app, clicking Install new... and selecting the Door sensor.
Once a device is installed, it can be deleted by selecting the correct door sensor from the list under Devices, selecting Delete and following the instructions. 
If a devices is unresponsive, or the gateway is no longer available, the device can be factory reset using the following process:
  1. Open door sensor
  2. Press and hold Z-Wave button for 20 seconds
  3. Release button. The light will blink for 3 seconds to confirm factory reset