To check why cannot the sensor be connected to the Bluetooth gateway, please refer to the following details:
1. The device that you use is not equipped with a Bluetooth Mesh gateway, or the Bluetooth Mesh gateway on the device is not turned on;
2. The distance between the sensor and the Bluetooth Mesh gateway is too far (the normal operating distance ranges from 10 to 15m);
3. There are too many obstructions of the wall between the sensor and the Bluetooth Mesh gateway (the Bluetooth signal can penetrate 1 to 2 pieces of wall);
4. The battery level is low after the long-term use.