Scans local area for visible Bluetooth devices. Use 'hcitool inq' to discover the type of device it is. And use -i hciX option to specify the local Bluetooth device to use.
Tries to switch all audio devices to the A2DP profile for optimal sound quality. Useful for bluetooth speakers and headphones that always power up in HSP/HFP mode. Note however that this command is only a shorthand for the GUI, so it cannot fix stubborn BT controllers that leave your device stuck in HSP mode until a manual re-coupling.
Turns off the bluetooth hardware module. To turn it back on use `rfkill unblock bluetooth`. Works in Ubuntu, probably in other distros as well. I don't know if you need some special user permission to do this. It worked for me out of the box.
Info about Bluetooth devices. Show Sample Output
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