After restarted the RPi, enter the command hciconfig (similar to the command
ifconfig) to check the Bluetooth service.
If the Bluetooth has been working, you will see the device hci0 displayed on the
screen. When the Bluetooth does not work, no Bluetooth device can be identified.
Note: If the line dtoverlay=pi3-miniuart-bt exists in the file /boot/config.txt, it
should be commented out.
5) Connect to Bluetooth device
Input the following command to enter the Bluetooth control interface (you can
input the command help to check the command list after entered the interface).
sudo bluetoothctl
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