lowenergyscanner: Use new connect syntax

Change-Id: I87047bbc8b777f597ac4843c0c5466489d764f46
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

examples/bluetooth/lowenergyscanner/device.cpp

@@ -55,11 +55,11 @@ Device::Device():
     //! [les-devicediscovery-1]
     discoveryAgent = new QBluetoothDeviceDiscoveryAgent();
     discoveryAgent->setLowEnergyDiscoveryTimeout(5000);
-    connect(discoveryAgent, SIGNAL(deviceDiscovered(const QBluetoothDeviceInfo&)),
-            this, SLOT(addDevice(const QBluetoothDeviceInfo&)));
-    connect(discoveryAgent, SIGNAL(error(QBluetoothDeviceDiscoveryAgent::Error)),
-            this, SLOT(deviceScanError(QBluetoothDeviceDiscoveryAgent::Error)));
-    connect(discoveryAgent, SIGNAL(finished()), this, SLOT(deviceScanFinished()));
+    connect(discoveryAgent, &QBluetoothDeviceDiscoveryAgent::deviceDiscovered,
+            this, &Device::addDevice);
+    connect(discoveryAgent, QOverload<QBluetoothDeviceDiscoveryAgent::Error>::of(&QBluetoothDeviceDiscoveryAgent::error),
+            this, &Device::deviceScanError);
+    connect(discoveryAgent, &QBluetoothDeviceDiscoveryAgent::finished, this, &Device::deviceScanFinished);
     //! [les-devicediscovery-1]
 
     setUpdate("Search");
@@ -169,16 +169,16 @@ void Device::scanServices(const QString &address)
     if (!controller) {
         // Connecting signals and slots for connecting to LE services.
         controller = new QLowEnergyController(currentDevice.getDevice());
-        connect(controller, SIGNAL(connected()),
-                this, SLOT(deviceConnected()));
-        connect(controller, SIGNAL(error(QLowEnergyController::Error)),
-                this, SLOT(errorReceived(QLowEnergyController::Error)));
-        connect(controller, SIGNAL(disconnected()),
-                this, SLOT(deviceDisconnected()));
-        connect(controller, SIGNAL(serviceDiscovered(QBluetoothUuid)),
-                this, SLOT(addLowEnergyService(QBluetoothUuid)));
-        connect(controller, SIGNAL(discoveryFinished()),
-                this, SLOT(serviceScanDone()));
+        connect(controller, &QLowEnergyController::connected,
+                this, &Device::deviceConnected);
+        connect(controller, QOverload<QLowEnergyController::Error>::of(&QLowEnergyController::error),
+                this, &Device::errorReceived);
+        connect(controller, &QLowEnergyController::disconnected,
+                this, &Device::deviceDisconnected);
+        connect(controller, &QLowEnergyController::serviceDiscovered,
+                this, &Device::addLowEnergyService);
+        connect(controller, &QLowEnergyController::discoveryFinished,
+                this, &Device::serviceScanDone);
     }
 
     if (isRandomAddress())
@@ -235,8 +235,8 @@ void Device::connectToService(const QString &uuid)
 
     if (service->state() == QLowEnergyService::DiscoveryRequired) {
         //! [les-service-3]
-        connect(service, SIGNAL(stateChanged(QLowEnergyService::ServiceState)),
-                this, SLOT(serviceDetailsDiscovered(QLowEnergyService::ServiceState)));
+        connect(service, &QLowEnergyService::stateChanged,
+                this, &Device::serviceDetailsDiscovered);
         service->discoverDetails();
         setUpdate("Back\n(Discovering details...)");
         //! [les-service-3]
@@ -250,7 +250,7 @@ void Device::connectToService(const QString &uuid)
         m_characteristics.append(cInfo);
     }
 
-    QTimer::singleShot(0, this, SIGNAL(characteristicsUpdated()));
+    QTimer::singleShot(0, this, &Device::characteristicsUpdated);
 }
 
 void Device::deviceConnected()