1. Turn off the Bluetooth of the mobile phone (on the mobile phone);
2. Low-power devices can configure the broadcast interval 0 under low power consumption through the CMD-0xE2 command, that is, low power consumption does not broadcast. Then send CMD-0xE7 to actively disconnect the Bluetooth connection. Finally enter low power consumption;
3. If the firmware version supports CMD-0xA3, you can first send CMD-0xA3 to turn off the broadcast enable, and then send CMD-0xE7 to actively disconnect the Bluetooth connection. This method is recommended.