Yessss...Thanks a lot!! Now it works.
Its great that there is possibility to code with Vuo Framework. Sometimes its much easier and more efficient to write some code than draw thousands of virtual wires.
(rebooting Vuo editor and reloading project after every code change is anoying, but I hope it will be fixed someday)
I changed Make OSC Output -node to Make OSC IP Output -node, to send only to localhost (127.0.0.1). Now OSC messages are sent only once.
Help of Make OSC Output -node says that it sends messages to all devices. I made List OSC Devices -node to see what are those all devices, at least for me Vuo shows two devices when only my VuoOscOutBug3.vuo composition is running.
Vuo OSC Clientreceiving from 192.168.56.1 port 4444 Vuo OSC Clientreceiving from 172.16.130.216 port 4444
Is this because of some loop in my network, maybe? Anyway I'm now happy that I can use Make OSC IP Output -node with localhost to solve my problem and send only single messages