Remove the sensors from the sensor list in your mobile App
Remove the sensor by choosing it from the sensors list in Mobile Application -> tap on the desired sensor -> Manage tab (in the middle) -> Remove Sensor. Exact same process for all your sensors.
Unpair the sensors before pairing again
To unpair the sensors from the gateway, the general way to press the RESET button on the sensor for 5 seconds or until the LED lights up.
For example in case of Door/Window or Temperature or Water Leakage sensors, please take the pin needle and insert it into the small hole on the bottom left of the sensor. Press and hold it for 5 seconds or until the LED lights up.