@Kalliopei it depends on what you want to achieve.
If you want to draw the buffer you need to expose its display buffer (as you did already since the little icon is green), get a reference in the script and draw it in a panel using a timer.
If you want to get the nodes to performs realtime network modifications, you'll lose the ability to compile the network as DLL (it's one or the other).
And it's not getNode but just get