v0.0.5

android/AndroidManifest.xml

@@ -11,7 +11,7 @@
     <uses-permission android:name="android.permission.INTERNET"  />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"  />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>
-    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_SPECIAL_USE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_CONNECTED_DEVICE" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
     <uses-permission android:name="android.permission.NEARBY_WIFI_DEVICES" android:usesPermissionFlags="neverForLocation" />
     <supports-screens
@@ -28,10 +28,10 @@
         android:fullBackupOnly="false">
 
         <service android:name=".WaterLevelService"
-            android:foregroundServiceType="specialUse"
+            android:foregroundServiceType="connectedDevice"
             android:exported="true">
-            <property android:name="android.app.PROPERTY_SPECIAL_USE_FGS_SUBTYPE"
+<!--            <property android:name="android.app.PROPERTY_SPECIAL_USE_FGS_SUBTYPE"
-                      android:value="Monitoring water levels via local network UDP packets for real-time sensor alerts." />
+                      android:value="Monitoring water levels via local network UDP packets for real-time sensor alerts." />-->
             <meta-data android:name="android.app.lib_name" android:value="service"/>
             <meta-data android:name="android.app.background_running" android:value="true"/>
         </service>

android/src/org/qtproject/example/appwaterLevelSensor/WaterLevelService.java

@@ -65,9 +65,10 @@ public class WaterLevelService extends Service {
 
         @Override
         public void run() {
-            Log.d("UDP Service", "Thread initialising");
+            Log.d("UDP Service", "Client Thread initialising");
             android.net.wifi.WifiManager wifi = (android.net.wifi.WifiManager) getSystemService(Context.WIFI_SERVICE);
             android.net.wifi.WifiManager.MulticastLock multicastLock = wifi.createMulticastLock("water_level_lock");
+            android.net.wifi.WifiManager.WifiLock wifiLock = wifi.createWifiLock(android.net.wifi.WifiManager.WIFI_MODE_FULL_HIGH_PERF, "WaterLevel:WifiLock");
             android.os.PowerManager pm = (android.os.PowerManager) getSystemService(Context.POWER_SERVICE);
             android.os.PowerManager.WakeLock wakeLock = pm.newWakeLock(android.os.PowerManager.PARTIAL_WAKE_LOCK, "WaterLevel:WakeLock");
 
@@ -84,14 +85,26 @@ public class WaterLevelService extends Service {
             try {
                 multicastLock.acquire();
                 wakeLock.acquire();
-                socket_recv = new DatagramSocket(8176);
+                wifiLock.acquire();
+                socket_recv = new DatagramSocket(8176, InetAddress.getByName("0.0.0.0"));
                 socket_send = new DatagramSocket(8177);
                 socket_recv.setBroadcast(true);
+                socket_recv.setSoTimeout(4000);
                 Log.d("UDP Service", "Created Sockets");
+                int count = 0;
                 while (!Thread.currentThread().isInterrupted()) {
+                        count++;
+                        if(count == 3) {
+                            Log.i("UDP Service", "Thread is running");
+                            count = 0;
+                        }
                         byte[] buffer = new byte[4];
-                        DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
+                        try {
-                        socket_recv.receive(packet);
+                            DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
+                            socket_recv.receive(packet);
+                        } catch(java.net.SocketTimeoutException e) {
+                            continue;
+                        }
                         float f = ByteBuffer.wrap(buffer).order(ByteOrder.LITTLE_ENDIAN).getFloat();
                         Log.d("UDP Service ", "Received packet: " + f);
                         Log.d("UDP Service ", "Threshold is: " + alert_thres_distance);
@@ -128,6 +141,8 @@ public class WaterLevelService extends Service {
             catch (IOException e) {
                 Log.e("UDP Service", "Socket Error", e);
             } finally {
+            if (wifiLock.isHeld())
+                wifiLock.release();
             if (multicastLock.isHeld())
                 multicastLock.release();
             if (wakeLock.isHeld())

udplistener.cpp

@@ -39,6 +39,11 @@ void UDPListener::setDistance(double newDistance)
     emit distanceChanged();
 }
 
+void UDPListener::continueDestruction()
+{
+    destroyed = true;
+}
+
 void UDPListener::resetAverages()
 {
     averages.clear();
@@ -117,10 +122,24 @@ void UDPListener::destroy()
 {
     qDebug() << "Destroying UDP Listener";
     timer->stop();
+    connect(this, &UDPListener::stopWorker, worker, &Worker::stop);
+    connect(worker, &Worker::stopped, this, &UDPListener::continueDestruction);
+    emit stopWorker();
+    while(!destroyed) {
+        QCoreApplication::processEvents();
+    }
     thread->exit(0);
-    thread->deleteLater();
+    QCoreApplication::processEvents();
+    QCoreApplication::processEvents();
     worker->deleteLater();
+    QCoreApplication::processEvents();
+    QCoreApplication::processEvents();
+    thread->deleteLater();
+    QCoreApplication::processEvents();
+    QCoreApplication::processEvents();
     timer->deleteLater();
+    QCoreApplication::processEvents();
+    QCoreApplication::processEvents();
     qDebug() << "Deinitialized UDP Listener";
 }
 
@@ -149,6 +168,13 @@ Worker::Worker(QObject *parent)
 
 }
 
+void Worker::stop()
+{
+    disconnect(socket, nullptr, nullptr, nullptr);
+    delete socket;
+    emit stopped();
+}
+
 void Worker::run()
 {
     using namespace std::chrono_literals;

udplistener.h

@@ -16,9 +16,11 @@ class Worker: public QObject {
 public:
     explicit Worker(QObject *parent = nullptr);
 signals:
+    void stopped();
     void socketError(QString error);
     void datagramReceived(QByteArray data, QByteArray data2);
 public slots:
+    void stop();
     void run();
 private slots:
     void socketDataReceived();
@@ -29,11 +31,13 @@ class UDPListener : public QObject
     Q_OBJECT
     QML_ELEMENT
     Q_PROPERTY(double distance READ distance WRITE setDistance NOTIFY distanceChanged FINAL)
+    bool destroyed = false;
 public:
     explicit UDPListener(QObject *parent = nullptr);
     double distance() const;
     void setDistance(double newDistance);
 signals:
+    void stopWorker();
     void showError(QString err);
     void distanceChanged();
     void startWorker();
@@ -41,6 +45,7 @@ signals:
     void disconnected();
     void distanceReceived(double dist, QString timestamp);
 public slots:
+    void continueDestruction();
     void resetAverages();
     void setFlipBits(bool flip_bits);
     void setConfig(float distance, bool flip_bits);