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<h1 class="title">device.cpp Example File</h1>
<span class="subtitle">lowenergyscanner/device.cpp</span>
<!-- $$$lowenergyscanner/device.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/***************************************************************************
  **
  ** Copyright (C) 2013 BlackBerry Limited. All rights reserved.
  ** Copyright (C) 2015 The Qt Company Ltd.
  ** Contact: http://www.qt.io/licensing/
  **
  ** This file is part of the QtBluetooth module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** You may use this file under the terms of the BSD license as follows:
  **
  ** &quot;Redistribution and use in source and binary forms, with or without
  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
  **   * Redistributions in binary form must reproduce the above copyright
  **     notice, this list of conditions and the following disclaimer in
  **     the documentation and/or other materials provided with the
  **     distribution.
  **   * Neither the name of The Qt Company Ltd nor the names of its
  **     contributors may be used to endorse or promote products derived
  **     from this software without specific prior written permission.
  **
  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  ** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &quot;device.h&quot;</span>
  <span class="preprocessor">#include &lt;qbluetoothaddress.h&gt;</span>
  <span class="preprocessor">#include &lt;qbluetoothdevicediscoveryagent.h&gt;</span>
  <span class="preprocessor">#include &lt;qbluetoothlocaldevice.h&gt;</span>
  <span class="preprocessor">#include &lt;qbluetoothdeviceinfo.h&gt;</span>
  <span class="preprocessor">#include &lt;qbluetoothservicediscoveryagent.h&gt;</span>
  <span class="preprocessor">#include &lt;QDebug&gt;</span>
  <span class="preprocessor">#include &lt;QList&gt;</span>
  <span class="preprocessor">#include &lt;QTimer&gt;</span>

  Device<span class="operator">::</span>Device():
      connected(<span class="keyword">false</span>)<span class="operator">,</span> controller(<span class="number">0</span>)<span class="operator">,</span> m_deviceScanState(<span class="keyword">false</span>)<span class="operator">,</span> randomAddress(<span class="keyword">false</span>)
  {
      discoveryAgent <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QBluetoothDeviceDiscoveryAgent</span>();
      connect(discoveryAgent<span class="operator">,</span> SIGNAL(deviceDiscovered(<span class="keyword">const</span> <span class="type">QBluetoothDeviceInfo</span><span class="operator">&amp;</span>))<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> SLOT(addDevice(<span class="keyword">const</span> <span class="type">QBluetoothDeviceInfo</span><span class="operator">&amp;</span>)));
      connect(discoveryAgent<span class="operator">,</span> SIGNAL(error(<span class="type">QBluetoothDeviceDiscoveryAgent</span><span class="operator">::</span>Error))<span class="operator">,</span>
              <span class="keyword">this</span><span class="operator">,</span> SLOT(deviceScanError(<span class="type">QBluetoothDeviceDiscoveryAgent</span><span class="operator">::</span>Error)));
      connect(discoveryAgent<span class="operator">,</span> SIGNAL(finished())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(deviceScanFinished()));

      setUpdate(<span class="string">&quot;Search&quot;</span>);
  }

  Device<span class="operator">::</span><span class="operator">~</span>Device()
  {
      <span class="keyword">delete</span> discoveryAgent;
      <span class="keyword">delete</span> controller;
      <a href="../qtcore/qtalgorithms.html#qDeleteAll">qDeleteAll</a>(devices);
      <a href="../qtcore/qtalgorithms.html#qDeleteAll">qDeleteAll</a>(m_services);
      <a href="../qtcore/qtalgorithms.html#qDeleteAll">qDeleteAll</a>(m_characteristics);
      devices<span class="operator">.</span>clear();
      m_services<span class="operator">.</span>clear();
      m_characteristics<span class="operator">.</span>clear();
  }

  <span class="type">void</span> Device<span class="operator">::</span>startDeviceDiscovery()
  {
      <a href="../qtcore/qtalgorithms.html#qDeleteAll">qDeleteAll</a>(devices);
      devices<span class="operator">.</span>clear();
      <span class="keyword">emit</span> devicesUpdated();

      setUpdate(<span class="string">&quot;Scanning for devices ...&quot;</span>);
      discoveryAgent<span class="operator">-</span><span class="operator">&gt;</span>start();

      <span class="keyword">if</span> (discoveryAgent<span class="operator">-</span><span class="operator">&gt;</span>isActive()) {
          m_deviceScanState <span class="operator">=</span> <span class="keyword">true</span>;
          Q_EMIT stateChanged();
      }
  }

  <span class="type">void</span> Device<span class="operator">::</span>addDevice(<span class="keyword">const</span> <span class="type">QBluetoothDeviceInfo</span> <span class="operator">&amp;</span>info)
  {
      <span class="keyword">if</span> (info<span class="operator">.</span>coreConfigurations() <span class="operator">&amp;</span> <span class="type">QBluetoothDeviceInfo</span><span class="operator">::</span>LowEnergyCoreConfiguration) {
          DeviceInfo <span class="operator">*</span>d <span class="operator">=</span> <span class="keyword">new</span> DeviceInfo(info);
          devices<span class="operator">.</span>append(d);
          setUpdate(<span class="string">&quot;Last device added: &quot;</span> <span class="operator">+</span> d<span class="operator">-</span><span class="operator">&gt;</span>getName());
      }
  }

  <span class="type">void</span> Device<span class="operator">::</span>deviceScanFinished()
  {
      <span class="keyword">emit</span> devicesUpdated();
      m_deviceScanState <span class="operator">=</span> <span class="keyword">false</span>;
      <span class="keyword">emit</span> stateChanged();
      <span class="keyword">if</span> (devices<span class="operator">.</span>isEmpty())
          setUpdate(<span class="string">&quot;No Low Energy devices found...&quot;</span>);
      <span class="keyword">else</span>
          setUpdate(<span class="string">&quot;Done! Scan Again!&quot;</span>);
  }

  <span class="type">QVariant</span> Device<span class="operator">::</span>getDevices()
  {
      <span class="keyword">return</span> <span class="type">QVariant</span><span class="operator">::</span>fromValue(devices);
  }

  <span class="type">QVariant</span> Device<span class="operator">::</span>getServices()
  {
      <span class="keyword">return</span> <span class="type">QVariant</span><span class="operator">::</span>fromValue(m_services);
  }

  <span class="type">QVariant</span> Device<span class="operator">::</span>getCharacteristics()
  {
      <span class="keyword">return</span> <span class="type">QVariant</span><span class="operator">::</span>fromValue(m_characteristics);
  }

  <span class="type">QString</span> Device<span class="operator">::</span>getUpdate()
  {
      <span class="keyword">return</span> m_message;
  }

  <span class="type">void</span> Device<span class="operator">::</span>scanServices(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&amp;</span>address)
  {
      <span class="comment">// We need the current device for service discovery.</span>

      <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> devices<span class="operator">.</span>size(); i<span class="operator">+</span><span class="operator">+</span>) {
          <span class="keyword">if</span> (((DeviceInfo<span class="operator">*</span>)devices<span class="operator">.</span>at(i))<span class="operator">-</span><span class="operator">&gt;</span>getAddress() <span class="operator">=</span><span class="operator">=</span> address )
              currentDevice<span class="operator">.</span>setDevice(((DeviceInfo<span class="operator">*</span>)devices<span class="operator">.</span>at(i))<span class="operator">-</span><span class="operator">&gt;</span>getDevice());
      }

      <span class="keyword">if</span> (<span class="operator">!</span>currentDevice<span class="operator">.</span>getDevice()<span class="operator">.</span>isValid()) {
          <a href="../qtcore/qtglobal.html#qWarning">qWarning</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;Not a valid device&quot;</span>;
          <span class="keyword">return</span>;
      }

      <a href="../qtcore/qtalgorithms.html#qDeleteAll">qDeleteAll</a>(m_characteristics);
      m_characteristics<span class="operator">.</span>clear();
      <span class="keyword">emit</span> characteristicsUpdated();
      <a href="../qtcore/qtalgorithms.html#qDeleteAll">qDeleteAll</a>(m_services);
      m_services<span class="operator">.</span>clear();
      <span class="keyword">emit</span> servicesUpdated();

      setUpdate(<span class="string">&quot;Back\n(Connecting to device...)&quot;</span>);

      <span class="keyword">if</span> (controller <span class="operator">&amp;</span><span class="operator">&amp;</span> m_previousAddress <span class="operator">!</span><span class="operator">=</span> currentDevice<span class="operator">.</span>getAddress()) {
          controller<span class="operator">-</span><span class="operator">&gt;</span>disconnectFromDevice();
          <span class="keyword">delete</span> controller;
          controller <span class="operator">=</span> <span class="number">0</span>;
      }

      <span class="keyword">if</span> (<span class="operator">!</span>controller) {
          <span class="comment">// Connecting signals and slots for connecting to LE services.</span>
          controller <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QLowEnergyController</span>(currentDevice<span class="operator">.</span>getDevice());
          connect(controller<span class="operator">,</span> SIGNAL(connected())<span class="operator">,</span>
                  <span class="keyword">this</span><span class="operator">,</span> SLOT(deviceConnected()));
          connect(controller<span class="operator">,</span> SIGNAL(error(<span class="type">QLowEnergyController</span><span class="operator">::</span>Error))<span class="operator">,</span>
                  <span class="keyword">this</span><span class="operator">,</span> SLOT(errorReceived(<span class="type">QLowEnergyController</span><span class="operator">::</span>Error)));
          connect(controller<span class="operator">,</span> SIGNAL(disconnected())<span class="operator">,</span>
                  <span class="keyword">this</span><span class="operator">,</span> SLOT(deviceDisconnected()));
          connect(controller<span class="operator">,</span> SIGNAL(serviceDiscovered(<span class="type">QBluetoothUuid</span>))<span class="operator">,</span>
                  <span class="keyword">this</span><span class="operator">,</span> SLOT(addLowEnergyService(<span class="type">QBluetoothUuid</span>)));
          connect(controller<span class="operator">,</span> SIGNAL(discoveryFinished())<span class="operator">,</span>
                  <span class="keyword">this</span><span class="operator">,</span> SLOT(serviceScanDone()));
      }

      <span class="keyword">if</span> (isRandomAddress())
          controller<span class="operator">-</span><span class="operator">&gt;</span>setRemoteAddressType(<span class="type">QLowEnergyController</span><span class="operator">::</span>RandomAddress);
      <span class="keyword">else</span>
          controller<span class="operator">-</span><span class="operator">&gt;</span>setRemoteAddressType(<span class="type">QLowEnergyController</span><span class="operator">::</span>PublicAddress);
      controller<span class="operator">-</span><span class="operator">&gt;</span>connectToDevice();

      m_previousAddress <span class="operator">=</span> currentDevice<span class="operator">.</span>getAddress();
  }

  <span class="type">void</span> Device<span class="operator">::</span>addLowEnergyService(<span class="keyword">const</span> <span class="type">QBluetoothUuid</span> <span class="operator">&amp;</span>serviceUuid)
  {
      <span class="type">QLowEnergyService</span> <span class="operator">*</span>service <span class="operator">=</span> controller<span class="operator">-</span><span class="operator">&gt;</span>createServiceObject(serviceUuid);
      <span class="keyword">if</span> (<span class="operator">!</span>service) {
          <a href="../qtcore/qtglobal.html#qWarning">qWarning</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;Cannot create service for uuid&quot;</span>;
          <span class="keyword">return</span>;
      }
      ServiceInfo <span class="operator">*</span>serv <span class="operator">=</span> <span class="keyword">new</span> ServiceInfo(service);
      m_services<span class="operator">.</span>append(serv);

      <span class="keyword">emit</span> servicesUpdated();
  }

  <span class="type">void</span> Device<span class="operator">::</span>serviceScanDone()
  {
      setUpdate(<span class="string">&quot;Back\n(Service scan done!)&quot;</span>);
      <span class="comment">// force UI in case we didn't find anything</span>
      <span class="keyword">if</span> (m_services<span class="operator">.</span>isEmpty())
          <span class="keyword">emit</span> servicesUpdated();
  }

  <span class="type">void</span> Device<span class="operator">::</span>connectToService(<span class="keyword">const</span> <span class="type">QString</span> <span class="operator">&amp;</span>uuid)
  {
      <span class="type">QLowEnergyService</span> <span class="operator">*</span>service <span class="operator">=</span> <span class="number">0</span>;
      <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> m_services<span class="operator">.</span>size(); i<span class="operator">+</span><span class="operator">+</span>) {
          ServiceInfo <span class="operator">*</span>serviceInfo <span class="operator">=</span> (ServiceInfo<span class="operator">*</span>)m_services<span class="operator">.</span>at(i);
          <span class="keyword">if</span> (serviceInfo<span class="operator">-</span><span class="operator">&gt;</span>getUuid() <span class="operator">=</span><span class="operator">=</span> uuid) {
              service <span class="operator">=</span> serviceInfo<span class="operator">-</span><span class="operator">&gt;</span>service();
              <span class="keyword">break</span>;
          }
      }

      <span class="keyword">if</span> (<span class="operator">!</span>service)
          <span class="keyword">return</span>;

      <a href="../qtcore/qtalgorithms.html#qDeleteAll">qDeleteAll</a>(m_characteristics);
      m_characteristics<span class="operator">.</span>clear();
      <span class="keyword">emit</span> characteristicsUpdated();

      <span class="keyword">if</span> (service<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">=</span><span class="operator">=</span> <span class="type">QLowEnergyService</span><span class="operator">::</span>DiscoveryRequired) {
          connect(service<span class="operator">,</span> SIGNAL(stateChanged(<span class="type">QLowEnergyService</span><span class="operator">::</span>ServiceState))<span class="operator">,</span>
                  <span class="keyword">this</span><span class="operator">,</span> SLOT(serviceDetailsDiscovered(<span class="type">QLowEnergyService</span><span class="operator">::</span>ServiceState)));
          service<span class="operator">-</span><span class="operator">&gt;</span>discoverDetails();
          setUpdate(<span class="string">&quot;Back\n(Discovering details...)&quot;</span>);
          <span class="keyword">return</span>;
      }

      <span class="comment">//discovery already done</span>
      <span class="keyword">const</span> <span class="type">QList</span><span class="operator">&lt;</span><span class="type">QLowEnergyCharacteristic</span><span class="operator">&gt;</span> chars <span class="operator">=</span> service<span class="operator">-</span><span class="operator">&gt;</span>characteristics();
      foreach (<span class="keyword">const</span> <span class="type">QLowEnergyCharacteristic</span> <span class="operator">&amp;</span>ch<span class="operator">,</span> chars) {
          CharacteristicInfo <span class="operator">*</span>cInfo <span class="operator">=</span> <span class="keyword">new</span> CharacteristicInfo(ch);
          m_characteristics<span class="operator">.</span>append(cInfo);
      }

      <span class="type">QTimer</span><span class="operator">::</span>singleShot(<span class="number">0</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SIGNAL(characteristicsUpdated()));
  }

  <span class="type">void</span> Device<span class="operator">::</span>deviceConnected()
  {
      setUpdate(<span class="string">&quot;Back\n(Discovering services...)&quot;</span>);
      connected <span class="operator">=</span> <span class="keyword">true</span>;
      controller<span class="operator">-</span><span class="operator">&gt;</span>discoverServices();
  }

  <span class="type">void</span> Device<span class="operator">::</span>errorReceived(<span class="type">QLowEnergyController</span><span class="operator">::</span>Error <span class="comment">/*error*/</span>)
  {
      <a href="../qtcore/qtglobal.html#qWarning">qWarning</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;Error: &quot;</span> <span class="operator">&lt;</span><span class="operator">&lt;</span> controller<span class="operator">-</span><span class="operator">&gt;</span>errorString();
      setUpdate(<span class="type">QString</span>(<span class="string">&quot;Back\n(%1)&quot;</span>)<span class="operator">.</span>arg(controller<span class="operator">-</span><span class="operator">&gt;</span>errorString()));
  }

  <span class="type">void</span> Device<span class="operator">::</span>setUpdate(<span class="type">QString</span> message)
  {
      m_message <span class="operator">=</span> message;
      <span class="keyword">emit</span> updateChanged();
  }

  <span class="type">void</span> Device<span class="operator">::</span>disconnectFromDevice()
  {
      <span class="comment">// UI always expects disconnect() signal when calling this signal</span>
      <span class="comment">// TODO what is really needed is to extend state() to a multi value</span>
      <span class="comment">// and thus allowing UI to keep track of controller progress in addition to</span>
      <span class="comment">// device scan progress</span>

      <span class="keyword">if</span> (controller<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">!</span><span class="operator">=</span> <span class="type">QLowEnergyController</span><span class="operator">::</span>UnconnectedState)
          controller<span class="operator">-</span><span class="operator">&gt;</span>disconnectFromDevice();
      <span class="keyword">else</span>
          deviceDisconnected();
  }

  <span class="type">void</span> Device<span class="operator">::</span>deviceDisconnected()
  {
      <a href="../qtcore/qtglobal.html#qWarning">qWarning</a>() <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="string">&quot;Disconnect from device&quot;</span>;
      <span class="keyword">emit</span> disconnected();
  }

  <span class="type">void</span> Device<span class="operator">::</span>serviceDetailsDiscovered(<span class="type">QLowEnergyService</span><span class="operator">::</span>ServiceState newState)
  {
      <span class="keyword">if</span> (newState <span class="operator">!</span><span class="operator">=</span> <span class="type">QLowEnergyService</span><span class="operator">::</span>ServiceDiscovered) {
          <span class="comment">// do not hang in &quot;Scanning for characteristics&quot; mode forever</span>
          <span class="comment">// in case the service discovery failed</span>
          <span class="comment">// We have to queue the signal up to give UI time to even enter</span>
          <span class="comment">// the above mode</span>
          <span class="keyword">if</span> (newState <span class="operator">!</span><span class="operator">=</span> <span class="type">QLowEnergyService</span><span class="operator">::</span>DiscoveringServices) {
              <span class="type">QMetaObject</span><span class="operator">::</span>invokeMethod(<span class="keyword">this</span><span class="operator">,</span> <span class="string">&quot;characteristicsUpdated&quot;</span><span class="operator">,</span>
                                        <span class="type">Qt</span><span class="operator">::</span>QueuedConnection);
          }
          <span class="keyword">return</span>;
      }

      <span class="type">QLowEnergyService</span> <span class="operator">*</span>service <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span><span class="type">QLowEnergyService</span> <span class="operator">*</span><span class="operator">&gt;</span>(sender());
      <span class="keyword">if</span> (<span class="operator">!</span>service)
          <span class="keyword">return</span>;

      <span class="keyword">const</span> <span class="type">QList</span><span class="operator">&lt;</span><span class="type">QLowEnergyCharacteristic</span><span class="operator">&gt;</span> chars <span class="operator">=</span> service<span class="operator">-</span><span class="operator">&gt;</span>characteristics();
      foreach (<span class="keyword">const</span> <span class="type">QLowEnergyCharacteristic</span> <span class="operator">&amp;</span>ch<span class="operator">,</span> chars) {
          CharacteristicInfo <span class="operator">*</span>cInfo <span class="operator">=</span> <span class="keyword">new</span> CharacteristicInfo(ch);
          m_characteristics<span class="operator">.</span>append(cInfo);
      }

      <span class="keyword">emit</span> characteristicsUpdated();
  }

  <span class="type">void</span> Device<span class="operator">::</span>deviceScanError(<span class="type">QBluetoothDeviceDiscoveryAgent</span><span class="operator">::</span>Error error)
  {
      <span class="keyword">if</span> (error <span class="operator">=</span><span class="operator">=</span> <span class="type">QBluetoothDeviceDiscoveryAgent</span><span class="operator">::</span>PoweredOffError)
          setUpdate(<span class="string">&quot;The Bluetooth adaptor is powered off, power it on before doing discovery.&quot;</span>);
      <span class="keyword">else</span> <span class="keyword">if</span> (error <span class="operator">=</span><span class="operator">=</span> <span class="type">QBluetoothDeviceDiscoveryAgent</span><span class="operator">::</span>InputOutputError)
          setUpdate(<span class="string">&quot;Writing or reading from the device resulted in an error.&quot;</span>);
      <span class="keyword">else</span>
          setUpdate(<span class="string">&quot;An unknown error has occurred.&quot;</span>);

      m_deviceScanState <span class="operator">=</span> <span class="keyword">false</span>;
      <span class="keyword">emit</span> devicesUpdated();
      <span class="keyword">emit</span> stateChanged();
  }

  bool Device<span class="operator">::</span>state()
  {
      <span class="keyword">return</span> m_deviceScanState;
  }

  bool Device<span class="operator">::</span>hasControllerError() <span class="keyword">const</span>
  {
      <span class="keyword">if</span> (controller <span class="operator">&amp;</span><span class="operator">&amp;</span> controller<span class="operator">-</span><span class="operator">&gt;</span>error() <span class="operator">!</span><span class="operator">=</span> <span class="type">QLowEnergyController</span><span class="operator">::</span>NoError)
          <span class="keyword">return</span> <span class="keyword">true</span>;
      <span class="keyword">return</span> <span class="keyword">false</span>;
  }

  bool Device<span class="operator">::</span>isRandomAddress() <span class="keyword">const</span>
  {
      <span class="keyword">return</span> randomAddress;
  }

  <span class="type">void</span> Device<span class="operator">::</span>setRandomAddress(bool newValue)
  {
      randomAddress <span class="operator">=</span> newValue;
      <span class="keyword">emit</span> randomAddressChanged();
  }

</pre>
</div>
<!-- @@@lowenergyscanner/device.cpp -->
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