app/qml/connections/StartpadConn.qml

import QtQuick 2.0

Item {
    id: startpadConn
    height: 0
    width: 0
    opacity: 0
    visible: false

    signal pushed()
    property bool connected: false
    property var status: {'status': startpadConn.state, 'progress': get_progress()}

    Timer {
        //timer that refreshes the connection state to the buzzer
        id: connectionRefreshTimer
        running: root.state !== "RUNNING" && root.state !== "STARTING" && startpadConn.status !== "connecting"
        repeat: false
        interval: 1000
        onTriggered: {
            _cppStartpadConn.refresh()
            if(!_cppStartpadConn.get("connected") && startpadConn.state !== "connecting"){
                startpadConn.state = "disconnected"
            }

            connectionRefreshTimer.start()
        }
    }

    Timer {
        //timer that checks, if the button has been pushed
        id: running_refresh_timer
        running: root.state === "RUNNING"
        repeat: false
        interval: 1

        onTriggered: {
            if(_cppStartpadConn.buzzer_triggered()){
                startpadConn.pushed()

            }
            if(root.state === "RUNNING" || root.state === "STARTING"){
                running_refresh_timer.start()
            }
        }
    }

    Timer {
        id: prog_refresh
        running: startpadConn.state === "connecting"
        interval: 1
        repeat: true
        onTriggered: {
            startpadConn.status.progress = get_progress()
        }
    }

    states: [
        State {
            name: "disconnected"
            PropertyChanges {
                target: startpadConn
            }
        },
        State {
            name: "connecting"
            PropertyChanges {
                target: startpadConn
            }
        },
        State {
            name: "connected"
            PropertyChanges {
                target: startpadConn
            }
        }
    ]

    function connect(){
        startpadConn.state = "connecting"
        if(_cppStartpadConn.connect()){
            startpadConn.state = "connected"
            return(true)
        }
        else {
            startpadConn.state = "disconnected"
            return(false)
        }


    }

    function get_progress(){
        return(_cppStartpadConn.get("connection_progress"))
    }
}