device.cpp Example File

lowenergyscanner/device.cpp
/***************************************************************************
**
** Copyright (C) 2013 BlackBerry Limited. All rights reserved.
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** 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:
**
** "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 Digia Plc and its Subsidiary(-ies) 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
** "AS IS" 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "device.h"
#include <qbluetoothaddress.h>
#include <qbluetoothdevicediscoveryagent.h>
#include <qbluetoothlocaldevice.h>
#include <qbluetoothdeviceinfo.h>
#include <qbluetoothservicediscoveryagent.h>
#include <QDebug>
#include <QList>
#include <QTimer>

Device::Device():
    connected(false), controller(0), m_deviceScanState(false), randomAddress(false)
{
    discoveryAgent = new QBluetoothDeviceDiscoveryAgent();
    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()));

    setUpdate("Search");
}

Device::~Device()
{
    delete discoveryAgent;
    delete controller;
    qDeleteAll(devices);
    qDeleteAll(m_services);
    qDeleteAll(m_characteristics);
    devices.clear();
    m_services.clear();
    m_characteristics.clear();
}

void Device::startDeviceDiscovery()
{
    qDeleteAll(devices);
    devices.clear();
    emit devicesUpdated();

    setUpdate("Scanning for devices ...");
    discoveryAgent->start();

    if (discoveryAgent->isActive()) {
        m_deviceScanState = true;
        Q_EMIT stateChanged();
    }
}

void Device::addDevice(const QBluetoothDeviceInfo &info)
{
    if (info.coreConfigurations() & QBluetoothDeviceInfo::LowEnergyCoreConfiguration) {
        DeviceInfo *d = new DeviceInfo(info);
        devices.append(d);
        setUpdate("Last device added: " + d->getName());
    }
}

void Device::deviceScanFinished()
{
    emit devicesUpdated();
    m_deviceScanState = false;
    emit stateChanged();
    if (devices.isEmpty())
        setUpdate("No Low Energy devices found...");
    else
        setUpdate("Done! Scan Again!");
}

QVariant Device::getDevices()
{
    return QVariant::fromValue(devices);
}

QVariant Device::getServices()
{
    return QVariant::fromValue(m_services);
}

QVariant Device::getCharacteristics()
{
    return QVariant::fromValue(m_characteristics);
}

QString Device::getUpdate()
{
    return m_message;
}

void Device::scanServices(const QString &address)
{
    // We need the current device for service discovery.
    for (int i = 0; i < devices.size(); i++) {
        if (((DeviceInfo*)devices.at(i))->getAddress() == address )
            currentDevice.setDevice(((DeviceInfo*)devices.at(i))->getDevice());
    }

    if (!currentDevice.getDevice().isValid()) {
        qWarning() << "Not a valid device";
        return;
    }

    qDeleteAll(m_characteristics);
    m_characteristics.clear();
    emit characteristicsUpdated();
    qDeleteAll(m_services);
    m_services.clear();
    emit servicesUpdated();

    setUpdate("Connecting to device...");

    if (controller && controller->remoteAddress() != currentDevice.getDevice().address()) {
        controller->disconnectFromDevice();
        delete controller;
        controller = 0;
    }

    if (!controller) {
        // Connecting signals and slots for connecting to LE services.
        controller = new QLowEnergyController(currentDevice.getDevice().address());
        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()));
    }

    if (isRandomAddress())
        controller->setRemoteAddressType(QLowEnergyController::RandomAddress);
    else
        controller->setRemoteAddressType(QLowEnergyController::PublicAddress);
    controller->connectToDevice();
}

void Device::addLowEnergyService(const QBluetoothUuid &serviceUuid)
{
    QLowEnergyService *service = controller->createServiceObject(serviceUuid);
    if (!service) {
        qWarning() << "Cannot create service for uuid";
        return;
    }
    ServiceInfo *serv = new ServiceInfo(service);
    m_services.append(serv);

    emit servicesUpdated();
}

void Device::serviceScanDone()
{
    setUpdate("Service scan done!");
    // force UI in case we didn't find anything
    if (m_services.isEmpty())
        emit servicesUpdated();
}

void Device::connectToService(const QString &uuid)
{
    QLowEnergyService *service = 0;
    for (int i = 0; i < m_services.size(); i++) {
        ServiceInfo *serviceInfo = (ServiceInfo*)m_services.at(i);
        if (serviceInfo->getUuid() == uuid) {
            service = serviceInfo->service();
            break;
        }
    }

    if (!service)
        return;

    qDeleteAll(m_characteristics);
    m_characteristics.clear();
    emit characteristicsUpdated();

    if (service->state() == QLowEnergyService::DiscoveryRequired) {
        connect(service, SIGNAL(stateChanged(QLowEnergyService::ServiceState)),
                this, SLOT(serviceDetailsDiscovered(QLowEnergyService::ServiceState)));
        service->discoverDetails();
        return;
    }

    //discovery already done
    const QList<QLowEnergyCharacteristic> chars = service->characteristics();
    foreach (const QLowEnergyCharacteristic &ch, chars) {
        CharacteristicInfo *cInfo = new CharacteristicInfo(ch);
        m_characteristics.append(cInfo);
    }

    QTimer::singleShot(0, this, SIGNAL(characteristicsUpdated()));
}

void Device::deviceConnected()
{
    setUpdate("Discovering services!");
    connected = true;
    controller->discoverServices();
}

void Device::errorReceived(QLowEnergyController::Error /*error*/)
{
    qWarning() << "Error: " << controller->errorString();
    setUpdate(QString("Back\n(%1)").arg(controller->errorString()));
}

void Device::setUpdate(QString message)
{
    m_message = message;
    emit updateChanged();
}

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

    if (controller->state() != QLowEnergyController::UnconnectedState)
        controller->disconnectFromDevice();
    else
        deviceDisconnected();
}

void Device::deviceDisconnected()
{
    qWarning() << "Disconnect from device";
    emit disconnected();
}

void Device::serviceDetailsDiscovered(QLowEnergyService::ServiceState newState)
{
    if (newState != QLowEnergyService::ServiceDiscovered)
        return;

    QLowEnergyService *service = qobject_cast<QLowEnergyService *>(sender());
    if (!service)
        return;

    const QList<QLowEnergyCharacteristic> chars = service->characteristics();
    foreach (const QLowEnergyCharacteristic &ch, chars) {
        CharacteristicInfo *cInfo = new CharacteristicInfo(ch);
        m_characteristics.append(cInfo);
    }

    emit characteristicsUpdated();
}

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

    m_deviceScanState = false;
    emit devicesUpdated();
    emit stateChanged();
}

bool Device::state()
{
    return m_deviceScanState;
}

bool Device::hasControllerError() const
{
    if (controller && controller->error() != QLowEnergyController::NoError)
        return true;
    return false;
}

bool Device::isRandomAddress() const
{
    return randomAddress;
}

void Device::setRandomAddress(bool newValue)
{
    randomAddress = newValue;
    emit randomAddressChanged();
}

© 2015 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.