Bluetooth scanning can scan for devices that are turned off about bluez-dbus

[hypfvieh]

Which devices are visible/found during scan depends on what bluez sees.
When bluez thinks that a device is still available (even though it has been turned off) it will be found during scan.

[1784450277]

After restarting my device, I can still scan the device that has been shut down. Where does this data exist? Is it possible for me to clear this data

[hypfvieh]

This library is only a bridge between java and bluez. It does this by providing the required interface classes used to connect to bluez using dbus.
If bluez has stored something somewhere and still propagates this information on dbus you will still get that information.

There is no way of clearing this data. This library simply uses what bluez is publishing on DBus. You may try the bluez commandline tool to check what bluez does. You may also use dbus commandline utils (or a GUI like d-feet) to see what information bluez is publishing on the bus.

[1784450277]

I have found a solution that can clear the cache after executing a command
service bluetooth stop
rm -rf /var/lib/bluetooth
service bluetooth start