QTSensors su Ubuntu Touch (UBPorts) in QML

Visto che sto imparando a programmare UBPorts ho voluto provare a convertire questo progetto Android/Kotlin per QML. In pratica si tratta di leggere i valori dell'accelerometro e, ad intervalli regolari, inviare i dati ad server web con una richiesta GET


Per abilitare l'utilizzo della rete nella app si deve modificare il file apparmor
apparmor
===========================================

{

    "policy_groups": ["networking"],

    "policy_version": 16.04

}

===========================================

Main.qml
===========================================
/*
 * Copyright (C) 2020  Your FullName
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 3.
 *
 * ubuntu-calculator-app is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import QtQuick 2.7
import Ubuntu.Components 1.3
//import QtQuick.Controls 2.2
import QtQuick.Layouts 1.3
import Qt.labs.settings 1.0

import QtSensors 5.0



MainView {
    id: root
    objectName: 'mainView'
    applicationName: 'acc2.luca.innocenti'
    automaticOrientation: true
   
    // variabili globali
    readonly property double radians_to_degrees: 180 / Math.PI
    property double pitch: 0.0
    property double roll: 0.0

    width: units.gu(45)
    height: units.gu(75)

    // un evento ogni 5 secondi
    Timer {
          interval: 5000
          running: true
          repeat: true
          onTriggered: {
            console.log("Timer")
            var xmlHttp = new XMLHttpRequest();
            xmlHttp.open("GET", "http://192.168.1.102/index.php?pitch="+pitch.toFixed(3)+"&roll="+roll.toFixed(3), true); // false for synchronous request
            xmlHttp.send();

          }
      }


    Accelerometer {
        id: accel
        dataRate: 100
        active:true

        onReadingChanged: {
            var x = accel.reading.x
            var y = accel.reading.y
            var z = accel.reading.z
            pitch = calcPitch(x,y,z)
            roll = calcRoll (x,y,z)
            //etichetta.text=""+accel.reading.x+"\n"+accel.reading.y+"\n"+accel.reading.z
            etichetta.text = "Pitch : "+pitch.toFixed(1)+"\nRoll : "+roll.toFixed(1)

            function calcPitch(x,y,z) {
                return Math.atan2(y, z)*radians_to_degrees;

                }
            function calcRoll(x,y,z) {
                return Math.atan2(-x, Math.sqrt((y*y)+(z*z)))*radians_to_degrees;
                }

          }


        }



    Page {
        anchors.fill: parent

        header: PageHeader {
            id: header
            title: i18n.tr('acc2')
        }


        Label {
            anchors {
                top: header.bottom
                left: parent.left
                right: parent.right
                bottom: parent.bottom
            }
            id: etichetta
            text: i18n.tr('Luca')

            verticalAlignment: Label.AlignVCenter
            horizontalAlignment: Label.AlignHCenter
        }

    }
}