But if to make lots of preparations:
0. Do not forget to include into the B4J library folder file: www.b4x.com/b4j/files/bluecove-2.1.1-SNAPSHOT.jar
1. Install Linux Bluetooth Bluecove stack (the library we have, thanks, @Erel):
5. Give rights for SDP (Service Discovery Protocol):
...And do not forget to switch the BT module on at the "icon-tray".... and anyway some non-stability of work
0. Do not forget to include into the B4J library folder file: www.b4x.com/b4j/files/bluecove-2.1.1-SNAPSHOT.jar
1. Install Linux Bluetooth Bluecove stack (the library we have, thanks, @Erel):
2. Include the user into "bluetooth" group:sudo apt-get install bluez libbluetooth-dev
4. Setup driver settings:sudo usermod -a -G bluetooth ${SUDO_USER:-$USER}
sudo cp /lib/systemd/system/bluetooth.service /etc/systemd/system/bluetooth.service #copy the default BT settings file to edit
sudo sed -i 's|ExecStart=/usr/lib/bluetooth/bluetoothd|ExecStart=/usr/lib/bluetooth/bluetoothd -C|g' /etc/systemd/system/bluetooth.service #add "-C" key to the starting line of the BT deamon (start in the "compatibility" mode)
sudo systemctl daemon-reload #reload the BT deamon
sudo systemctl restart bluetooth #restart BT service
5. Give rights for SDP (Service Discovery Protocol):
sudo chmod 0777 /var/run/sdp
...And do not forget to switch the BT module on at the "icon-tray".... and anyway some non-stability of work
and if to try to make this all in the scripts of a .deb-package - to kill himself is much simpler. But i'm alive 
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