Умный переключатель 小米无线开关（蓝牙版）

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Optimize device reset logic.

1. Optimized the battery power detection function 2. Fixed the problem that the device cannot broadcast in the BLE connection state

1. Users can press and hold the button for more than 20 seconds to enter the sleep mode, so as to reduce the power consumption. 2. The BLE connection algorithm after replacing the battery is optimized.