I am passing the coordinate value from c++ to qml and assigning that value to coordinate type in qml. But when i tried to print the coordinate value nothing is printed. when i tried to print the passed value through console.log i am able to see the value. What am i missing?

 Plane {
                id: cppPlane
                pilotName: "PCC"

               coordinate: backend.headingPos
                //coordinate: bengaluru



                MouseArea {

                    anchors.fill: parent
                          }

                Timer{

                    id:timer1
                    interval: 100
                    running: true
                    repeat: false

                    onTriggered: {

                        mapofKA.zoomLevel=4
                        console.log(backend.dataDir)
                        console.log(cppPlane.coordinate)
                        console.log(backend.headingPos)

                        if (cppPlaneAnimation.running || backend.isFlying())
                        {
                               console.log("Plane still in the air.");
                               return;
                         }


                         cppPlaneAnimation.start();
                         cppPlane.departed();

                    }

                }
}

In the console:
qml: D:/MAPDATA
qml: 
qml: 12° 17' 44.9" N, 76° 38' 21.8" E