iot-sensortag: Allow reconnect after a failed connection attempt

A disconnected sensor tag can be tried to be reconnected by clicking
on the chart area or starting rescan from the Sensor settings menu.
During a (re)connection process a progress indicator is shown to
the user.

The user has a possibility to disconnect (and reconnect) a
currently connect SensorDataProvider

A new state, 'NotFound' is added in SensorTagDataProvider to
distinguish between states when a Sensor Tag has not been discovered
at all, and when it has already been discovered but is has been
disconnected.

Change-Id: I54eea72d8c92a67a5ccbb3bc192ac8f33ada1c39
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@qt.io>

1 files changed, 2 insertions, 1 deletions

diff --git a/tradeshow/iot-sensortag/bluetoothdataprovider.h b/tradeshow/iot-sensortag/bluetoothdataprovider.h
index f4c4b15..691b94c 100644
--- a/tradeshow/iot-sensortag/bluetoothdataprovider.h
+++ b/tradeshow/iot-sensortag/bluetoothdataprovider.h
@@ -70,6 +70,7 @@ public:
     QString versionString() const;
 
     void bindToDevice(BluetoothDevice *device);
+    void unbindDevice();
     BluetoothDevice* device();
 
 public slots:
@@ -88,7 +89,7 @@ protected:
 private:
     void updateState();
     float countRotationDegrees(double degreesPerSecond, quint64 milliseconds);
-    BluetoothDevice* activeDevice;
+    BluetoothDevice *m_btDevice;
     QTimer timer;
     int m_smaSamples;
     int m_zeroAltitudeSamples;