Here is a complete listing of the example source file.
import QtQuick 2.0
import QtQuick.Controls 2.0
 
 
Item {
    Switch {
        id: element
        x: 10
        y: 10
        text: qsTr("Switch")
 
            id: coilItem
            controller.device: client
            controller.address: 10
            anchors.horizontalCenter: parent.horizontalCenter
            anchors.verticalCenter: parent.verticalCenter
        }
    }
 
    CheckBox {
        id: checkBox
        x: 10
        y: 80
        text: qsTr("Check Box")
 
            id: coilItem1
            controller.device: client
            controller.address: 10
            anchors.horizontalCenter: parent.horizontalCenter
            anchors.verticalCenter: parent.verticalCenter
        }
    }
 
    Label {
        id: label
        x: 227
        y: 94
        text: qsTr("Label")
 
            id: holdingRegisterItem1
            controller.device: client
            controller.address: 10
            delegateProperty: "text"
            anchors.horizontalCenter: parent.horizontalCenter
            anchors.verticalCenter: parent.verticalCenter
        }
    }
 
    SpinBox {
        id: spinBox
        x: 160
        y: 10
 
            id: holdingRegisterItem
            controller.device: client
            controller.address: 10
            anchors.horizontalCenter: parent.horizontalCenter
            anchors.verticalCenter: parent.verticalCenter
        }
    }
}