After some more tests I detected a strange behaviour on RPi web interface. Simpledesk on Rpi web interface sliders don't react to the DMX channels values sended from QLC+ on laptop via Artnet. But if I connect a external monitor to the RPi the Simpledesk tab sliders reacts to the DMX values sended from QLC+ on laptop.
Moving slider from Simpledesk on external monitor slider on Simpledesk in web interface reacts this works well too moving sliders from web interface.
USB dongle receives well the DMX data, tested with a simple DMX tester not with a real fixture.
EDITED: Is this the normal behaviour?
For more information see this comment: https://sourceforge.net/p/qlcplus/discu ... 3ff2/#1d32
Q Light Controller+
Official forums of the QLC+ project