Changed some things in Bluetooth communication and with a little magic, now the hello messages of the bottle are received.
My changes for that were only in communicate in the "right" way with the right characteristic (asked joern to know, which one it is).
Received packages each consisting of 20 characters are added together in broadcast update method. When message is complete it is displayed
in data-region of bottle details (have to change that, when tidying up gui) activity as readable string and hex.
At the moment the marker for string end is a '.' -> that should be changed as fast as possible, when joern can tell, how is marking the string end.