Ok, i tried it with my new freedom mini.

i followed the readme and i was able to get the bluetooth adress with './btkbd scan'.

After ./btkbd i get this:

Root shell enabled
Error org.bluez.serial.Error.ConnectionAttemptFailed: Host ist down
rfcomm bind to <BT Adress> failed

when i tried it a second time (just to make sure, i didn't do something wrong) i get this:
Root shell enabled
Error org.bluez.serial.Error.NotSupported: The service is not supported by the rfcomm bind to <BT Adress> failed
rfcomm bind to