using function in Connections in simulation qml breaks simulation

Connections backendSignals: Connections { 
target: backend 
onEnabledChanged: {

are reported to be deprecated. Changing to 

Connections backendSignals: Connections {
            target: backend
            function onEnabledChanged() {

leads to warning and not starts simulation

[WARN | qt.ivi.simulationengine | c.p.a.settings] qrc:/plugin_resource/simulation.qml:179:22: Duplicate method name: invalid override of property change signal or superclass signal