alright, i enabled DEBUG, let’s see what comes up 
this looks alright?
2017-05-07 19:18:53.724 [DEBUG] [.binding.knx.internal.bus.KNXBinding] - Wrote value '19.0' to datapoint 'command DP 0/4/3 ActualTemperature_Aussen, DPT main 0 id 9.001, low priority'
(no info like the one in my opening post pops up)