OpenHAB CULfw for Somfy RTS Rollershutters

Hello,

first of all I have to say thanks for the effort you put in here. I used the Somfy Thahoma Box all the time. Therefore I had to rely on the Somfy Server, since all the commands will run over their server. Unfortunately it seems that Friday evening someone pulls the plug of the server. Leading to not working shutters till Monday. So I downgraded my Openhabian from 3.0 to 2.5 and got This Cul

After some days of trail and error I got the binding, things and items working.
Current Setup:
Openhab 2.5
Raspberry Pi4 8GB
Habian 64bit
Binding: org.openhab.binding.somfycul-2.5.0 placed in the Addon Folder

somfycul:culdevice:cul [ port="/dev/ttyUSB0", baudrate="38400" ]
somfycul:somfydevice:ShutterArbeitszimmer (somfycul:culdevice:cul)

I followed the procedure with a Switch first and then changing to Rollershutter.

Now the bindings woks. I can send a command to my shutters via the Rollershutter item and they move. But they only move a small step and not to the end.

Rollershutter ProgrammShutterArbeitszimmer "Shutter Arbeitszimmer" (somfyFF) {channel="somfycul:somfydevice:ShutterArbeitszimmer:position"}

The Shutter Control has now the following parts:

Free to set number: Without function since it is not supported by my somfy motors
Up Arrow: Moves some small distance up
Down Arrow: Moves some distance down
Stop (MY): No function

somfycul_somfydevice_ShutterArbeitszimmer.properties file changes:

#Last command changes to up or down
#<Time> is changing as well to the time stamp of the last command
rollingCode is changing
adress is constant

Should the Stop or My Button not been seen there as well?

Is this the expected behavior?
How can I make them move completely to any end position?

Thanks in advance,
Christoph