In order to feed these outposts I've a train which visits every cities to supply facilities as belts, inserters, ... and robots !
This is quiet automated with circuit network, I define my facilities requirement on a constant combinator, then I allow fully dynamics filters on my servitude train's unloader based on my requirements and the current content into the logistic network :

I'm facing a problem to supply robot to my city : I can't output from my roboport both logistic content and logistic statistics? I need the second one to add the correct robot's filter to my unloader...
I could add a second roboport I know, but I would prefer a smarter way...
Do I miss something to allow both output? (they are not contradictory, further the logistic's statistics signals are configurable...)
Is there any mod to allow it ?
Do you think about other way to do it?
Furthermore do you have any threads about cities game to advise me?