Add initial Bluetooth backend implementation.

KDE Connect runs, and the bluetooth service gets published in the SDP
(service discovery protocol), which other devices use to determine what
services are available.

The getPairedDevices() method in the link provider class uses D-Bus to get
the list of paired devices, since Qt doesn't have a method giving that
information. As a result, that part of the code only works on Linux.

REVIEW: 122174

12 files changed, 841 insertions, 3 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 32cda38..fcdd8d2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,7 +10,7 @@ cmake_minimum_required(VERSION 2.8.12)
 find_package(ECM 0.0.9 REQUIRED NO_MODULE)
 set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH} ${ECM_KDE_MODULE_DIR} ${CMAKE_SOURCE_DIR}/cmake)
 
-find_package(Qt5 5.2 REQUIRED COMPONENTS Quick Test)
+find_package(Qt5 5.2 REQUIRED COMPONENTS Quick Test Bluetooth)
 find_package(KF5 REQUIRED COMPONENTS I18n KIO Notifications ConfigWidgets DBusAddons KCMUtils IconThemes)
 find_package(Qca-qt5 2.1.0 REQUIRED)
 
diff --git a/core/CMakeLists.txt b/core/CMakeLists.txt
index f25edbc..b622d36 100644
--- a/core/CMakeLists.txt
+++ b/core/CMakeLists.txt
@@ -8,12 +8,14 @@ include_directories(
 
 add_subdirectory(backends/lan)
 add_subdirectory(backends/loopback)
+add_subdirectory(backends/bluetooth)
 
 set(kded_kdeconnect_SRCS
     ${backends_kdeconnect_SRCS}
 
     backends/linkprovider.cpp
     backends/devicelink.cpp
+    backends/devicelinereader.cpp
 
     kdeconnectplugin.cpp
     pluginloader.cpp
@@ -31,6 +33,7 @@ PUBLIC
     Qt5::Network
     KF5::KIOCore
     qca-qt5
+    Qt5::Bluetooth
 PRIVATE
     Qt5::DBus
     Qt5::Gui
diff --git a/core/backends/bluetooth/CMakeLists.txt b/core/backends/bluetooth/CMakeLists.txt
new file mode 100644
index 0000000..125fa87
--- /dev/null
+++ b/core/backends/bluetooth/CMakeLists.txt
@@ -0,0 +1,9 @@
+
+set(backends_kdeconnect_SRCS
+    ${backends_kdeconnect_SRCS}
+
+    backends/bluetooth/bluetoothlinkprovider.cpp
+    backends/bluetooth/bluetoothdevicelink.cpp
+
+    PARENT_SCOPE
+)
diff --git a/core/backends/bluetooth/bluetoothdevicelink.cpp b/core/backends/bluetooth/bluetoothdevicelink.cpp
new file mode 100644
index 0000000..e3c1e33
--- /dev/null
+++ b/core/backends/bluetooth/bluetoothdevicelink.cpp
@@ -0,0 +1,110 @@
+/**
+ * Copyright 2015 Saikrishna Arcot <saiarcot895@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License or (at your option) version 3 or any later version
+ * accepted by the membership of KDE e.V. (or its successor approved
+ * by the membership of KDE e.V.), which shall act as a proxy
+ * defined in Section 14 of version 3 of the license.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "bluetoothdevicelink.h"
+
+#include "../linkprovider.h"
+
+BluetoothDeviceLink::BluetoothDeviceLink(const QString& deviceId, LinkProvider* parent, QBluetoothSocket* socket)
+    : DeviceLink(deviceId, parent)
+    , mBluetoothSocket(new DeviceLineReader(socket))
+{
+    connect(mBluetoothSocket, SIGNAL(readyRead()),
+            this, SLOT(dataReceived()));
+
+    //We take ownership of the socket.
+    //When the link provider distroys us,
+    //the socket (and the reader) will be
+    //destroyed as well
+    connect(mBluetoothSocket, SIGNAL(disconnected()),
+            this, SLOT(deleteLater()));
+    mBluetoothSocket->setParent(this);
+}
+
+/*void BluetoothDeviceLink::sendPayload(const QSharedPointer<QIODevice>& mInput)
+{
+    while ( mInput->bytesAvailable() > 0 )
+    {
+        qint64 bytes = qMin(mInput->bytesAvailable(), (qint64)4096);
+        int w = mBluetoothSocket->write(mInput->read(bytes));
+        if (w<0) {
+            qWarning() << "error when writing data to upload" << bytes << mInput->bytesAvailable();
+            break;
+        }
+        else
+        {
+            while ( mBluetoothSocket->flush() );
+        }
+    }
+
+    mInput->close();
+}*/
+
+bool BluetoothDeviceLink::sendPackageEncrypted(QCA::PublicKey& key, NetworkPackage& np)
+{
+    np.encrypt(key);
+    return sendPackage(np);
+}
+
+bool BluetoothDeviceLink::sendPackage(NetworkPackage& np)
+{
+    int written = mBluetoothSocket->write(np.serialize());
+    if (np.hasPayload()) {
+        qWarning() << "Bluetooth backend does not support payloads.";
+    }
+    return (written != -1);
+}
+
+void BluetoothDeviceLink::dataReceived()
+{
+
+    if (mBluetoothSocket->bytesAvailable() == 0) return;
+
+    const QByteArray package = mBluetoothSocket->readLine();
+
+    //kDebug(debugArea()) << "BluetoothDeviceLink dataReceived" << package;
+
+    NetworkPackage unserialized(QString::null);
+    NetworkPackage::unserialize(package, &unserialized);
+    if (unserialized.isEncrypted()) {
+        //mPrivateKey should always be set when device link is added to device, no null-checking done here
+        NetworkPackage decrypted(QString::null);
+        unserialized.decrypt(mPrivateKey, &decrypted);
+
+        if (decrypted.hasPayloadTransferInfo()) {
+            qWarning() << "Bluetooth backend does not support payloads.";
+        }
+
+        Q_EMIT receivedPackage(decrypted);
+
+    } else {
+        if (unserialized.hasPayloadTransferInfo()) {
+            qWarning() << "Ignoring unencrypted payload";
+        }
+
+        Q_EMIT receivedPackage(unserialized);
+
+    }
+
+    if (mBluetoothSocket->bytesAvailable() > 0) {
+        QMetaObject::invokeMethod(this, "dataReceived", Qt::QueuedConnection);
+    }
+
+}
diff --git a/core/backends/bluetooth/bluetoothdevicelink.h b/core/backends/bluetooth/bluetoothdevicelink.h
new file mode 100644
index 0000000..199d9ee
--- /dev/null
+++ b/core/backends/bluetooth/bluetoothdevicelink.h
@@ -0,0 +1,53 @@
+/**
+ * Copyright 2015 Saikrishna Arcot <saiarcot895@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License or (at your option) version 3 or any later version
+ * accepted by the membership of KDE e.V. (or its successor approved
+ * by the membership of KDE e.V.), which shall act as a proxy
+ * defined in Section 14 of version 3 of the license.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef BLUETOOTHDEVICELINK_H
+#define BLUETOOTHDEVICELINK_H
+
+#include <QObject>
+#include <QString>
+#include <QtBluetooth/QBluetoothSocket>
+
+#include "../devicelink.h"
+#include "../devicelinereader.h"
+
+class BluetoothDeviceLink
+    : public DeviceLink
+{
+    Q_OBJECT
+
+public:
+    BluetoothDeviceLink(const QString& deviceId, LinkProvider* parent, QBluetoothSocket* socket);
+
+    bool sendPackage(NetworkPackage& np);
+    bool sendPackageEncrypted(QCA::PublicKey& key, NetworkPackage& np);
+
+private Q_SLOTS:
+    void dataReceived();
+
+private:
+    DeviceLineReader* mBluetoothSocket;
+
+    //void sendPayload(const QSharedPointer<QIODevice>& mInput);
+    void sendMessage(const QString mMessage);
+
+};
+
+#endif
diff --git a/core/backends/bluetooth/bluetoothlinkprovider.cpp b/core/backends/bluetooth/bluetoothlinkprovider.cpp
new file mode 100644
index 0000000..2b78171
--- /dev/null
+++ b/core/backends/bluetooth/bluetoothlinkprovider.cpp
@@ -0,0 +1,367 @@
+/**
+ * Copyright 2015 Saikrishna Arcot <saiarcot895@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License or (at your option) version 3 or any later version
+ * accepted by the membership of KDE e.V. (or its successor approved
+ * by the membership of KDE e.V.), which shall act as a proxy
+ * defined in Section 14 of version 3 of the license.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "bluetoothlinkprovider.h"
+#include "core_debug.h"
+
+#include <KSharedConfig>
+#include <KConfigGroup>
+
+#include <QDBusArgument>
+#include <QDBusConnection>
+#include <QDBusInterface>
+#include <QDBusReply>
+
+#include "bluetoothdevicelink.h"
+
+BluetoothLinkProvider::BluetoothLinkProvider()
+{
+    if (!mDevice.isValid()) {
+        qCWarning(KDECONNECT_CORE) << "No local device found";
+        mBluetoothServer = NULL;
+        return;
+    }
+
+    mBluetoothServer = new QBluetoothServer(QBluetoothServiceInfo::RfcommProtocol, this);
+    mBluetoothServer->setSecurityFlags(QBluetooth::Encryption | QBluetooth::Secure);
+    connect(mBluetoothServer, SIGNAL(newConnection()), this, SLOT(serverNewConnection()));
+
+    mServiceUuid = QBluetoothUuid(QString("576bf9a0-98c9-11e4-bc89-0002a5d5c51b"));
+
+    connectTimer = new QTimer(this);
+    connectTimer->setInterval(30000);
+    connectTimer->setSingleShot(false);
+#if QT_VERSION < QT_VERSION_CHECK(5, 4, 0)
+    connect(connectTimer, SIGNAL(timeout()), this, SLOT(connectToPairedDevices()));
+#else
+    mServiceDiscoveryAgent = new QBluetoothServiceDiscoveryAgent(this);
+    mServiceDiscoveryAgent->setUuidFilter(mServiceUuid);
+    connect(mServiceDiscoveryAgent, SIGNAL(finished()), this, SLOT(serviceDiscoveryFinished()));
+    connect(connectTimer, SIGNAL(timeout()), mServiceDiscoveryAgent, SLOT(start()));
+#endif
+}
+
+void BluetoothLinkProvider::onStart()
+{
+    if (!mBluetoothServer) {
+        return;
+    }
+
+#if QT_VERSION < QT_VERSION_CHECK(5, 4, 0)
+    connectToPairedDevices();
+#else
+    mServiceDiscoveryAgent->start();
+#endif
+
+    connectTimer->start();
+    mKdeconnectService = mBluetoothServer->listen(mServiceUuid, "KDE Connect");
+
+    onNetworkChange(QNetworkSession::Connected);
+}
+
+void BluetoothLinkProvider::onStop()
+{
+    if (!mBluetoothServer) {
+        return;
+    }
+
+    connectTimer->stop();
+
+    mKdeconnectService.unregisterService();
+    mBluetoothServer->close();
+}
+
+//I'm in a new network, let's be polite and introduce myself
+void BluetoothLinkProvider::onNetworkChange(QNetworkSession::State state)
+{
+    Q_UNUSED(state);
+}
+
+QList<QBluetoothAddress> BluetoothLinkProvider::getPairedDevices() {
+    QDBusConnection bus = QDBusConnection::systemBus();
+    QDBusInterface manager_iface("org.bluez", "/","org.bluez.Manager", bus);
+
+    QDBusReply<QDBusObjectPath> devices = manager_iface.call("DefaultAdapter");
+
+    if (!devices.isValid()) {
+        qCWarning(KDECONNECT_CORE) << "Couldn't get default adapter:" << devices.error();
+        return QList<QBluetoothAddress>();
+    }
+
+    QDBusObjectPath defaultAdapter = devices.value();
+    QString defaultAdapterPath = defaultAdapter.path();
+
+    QDBusInterface devices_iface("org.bluez", defaultAdapterPath, "org.bluez.Adapter", bus);
+    QDBusMessage pairedDevices = devices_iface.call("ListDevices");
+
+    QDBusArgument pairedDevicesArg = pairedDevices.arguments().at(0).value<QDBusArgument>();
+    pairedDevicesArg.beginArray();
+    QList<QBluetoothAddress> pairedDevicesList;
+
+    while (!pairedDevicesArg.atEnd()) {
+        QVariant variant = pairedDevicesArg.asVariant();
+        QDBusObjectPath pairedDevice = qvariant_cast<QDBusObjectPath>(variant);
+        QString pairedDevicePath = pairedDevice.path();
+        QString pairedDeviceMac = pairedDevicePath.split(QChar('/')).last().remove("dev_").replace("_", ":");
+        pairedDevicesList.append(QBluetoothAddress(pairedDeviceMac));
+    }
+
+    return pairedDevicesList;
+}
+
+void BluetoothLinkProvider::connectToPairedDevices() {
+    QList<QBluetoothAddress> pairedDevices = getPairedDevices();
+    for (int i = 0; i < pairedDevices.size(); i++) {
+        QBluetoothAddress pairedDevice = pairedDevices.at(i);
+
+        if (mSockets.contains(pairedDevice)) {
+            continue;
+        }
+
+        QBluetoothSocket* socket = new QBluetoothSocket(QBluetoothServiceInfo::RfcommProtocol, this);
+        connect(socket, SIGNAL(connected()), this, SLOT(clientConnected()));
+        connect(socket, SIGNAL(error(QBluetoothSocket::SocketError)), this, SLOT(connectError()));
+        qCDebug(KDECONNECT_CORE()) << "BluetoothLinkProvider/onStart: Connecting to " << pairedDevice.toString();
+        socket->connectToService(pairedDevice, mServiceUuid);
+    }
+}
+
+void BluetoothLinkProvider::connectError()
+{
+    QBluetoothSocket* socket = qobject_cast<QBluetoothSocket*>(sender());
+    if (!socket) return;
+
+    qCWarning(KDECONNECT_CORE) << "connectError: Couldn't connect to socket:" << socket->errorString();
+
+    disconnect(socket, SIGNAL(connected()), this, SLOT(clientConnected()));
+    disconnect(socket, SIGNAL(readyRead()), this, SLOT(serverDataReceived()));
+    disconnect(socket, SIGNAL(error(QBluetoothSocket::SocketError)), this, SLOT(connectError()));
+
+    mSockets.remove(socket->peerAddress());
+    socket->deleteLater();
+}
+
+void BluetoothLinkProvider::addLink(BluetoothDeviceLink* deviceLink, const QString& deviceId)
+{
+    QMap< QString, DeviceLink* >::iterator oldLinkIterator = mLinks.find(deviceId);
+    if (oldLinkIterator != mLinks.end()) {
+        DeviceLink* oldLink = oldLinkIterator.value();
+        disconnect(oldLink, SIGNAL(destroyed(QObject*)),
+                    this, SLOT(deviceLinkDestroyed(QObject*)));
+        oldLink->deleteLater();
+        mLinks.erase(oldLinkIterator);
+    }
+
+    mLinks[deviceId] = deviceLink;
+}
+
+//I'm the new device and I found an existing device
+void BluetoothLinkProvider::serviceDiscoveryFinished()
+{
+    QList<QBluetoothServiceInfo> services = mServiceDiscoveryAgent->discoveredServices();
+
+    foreach (QBluetoothServiceInfo info, services) {
+        if (mSockets.contains(info.device().address())) {
+            continue;
+        }
+
+        QBluetoothSocket* socket = new QBluetoothSocket(QBluetoothServiceInfo::RfcommProtocol);
+
+        connect(socket, SIGNAL(connected()), this, SLOT(clientConnected()));
+        connect(socket, SIGNAL(error(QBluetoothSocket::SocketError)), this, SLOT(connectError()));
+
+        socket->connectToService(info);
+
+        qCDebug(KDECONNECT_CORE()) << "BluetoothLinkProvider/serviceDiscoveryFinished: Connecting to " << socket->peerAddress().toString();
+
+        if (socket->error() != QBluetoothSocket::NoSocketError) {
+            qCWarning(KDECONNECT_CORE) << "BluetoothLinkProvider/serviceDiscoveryFinished: Socket connection error: " << socket->errorString();
+        }
+    }
+}
+
+//I'm the new device and I'm connected to the existing device. Time to get data.
+void BluetoothLinkProvider::clientConnected()
+{
+    QBluetoothSocket* socket = qobject_cast<QBluetoothSocket*>(sender());
+    if (!socket) return;
+
+    qCDebug(KDECONNECT_CORE()) << "BluetoothLinkProvider/clientConnected: Connected to " << socket->peerAddress().toString();
+
+    if (mSockets.contains(socket->peerAddress())) {
+        qCDebug(KDECONNECT_CORE()) << "BluetoothLinkProvider/clientConnected: Duplicate connection to " << socket->peerAddress().toString();
+        socket->close();
+        socket->deleteLater();
+        return;
+    }
+
+    mSockets.insert(socket->peerAddress(), socket);
+
+    disconnect(socket, SIGNAL(connected()), this, SLOT(clientConnected()));
+
+    connect(socket, SIGNAL(readyRead()), this, SLOT(clientIdentityReceived()));
+    connect(socket, SIGNAL(disconnected()), this, SLOT(socketDisconnected()));
+}
+
+//I'm the new device and the existing device sent me data.
+void BluetoothLinkProvider::clientIdentityReceived()
+{
+    QBluetoothSocket* socket = qobject_cast<QBluetoothSocket*>(sender());
+    if (!socket) return;
+
+    QByteArray identityArray;
+    while (socket->bytesAvailable() > 0 || !identityArray.contains('\n')) {
+        identityArray += socket->readAll();
+    }
+
+    disconnect(socket, SIGNAL(readyRead()), this, SLOT(clientIdentityReceived()));
+
+    NetworkPackage receivedPackage("");
+    bool success = NetworkPackage::unserialize(identityArray, &receivedPackage);
+
+    if (!success || receivedPackage.type() != PACKAGE_TYPE_IDENTITY) {
+        qCDebug(KDECONNECT_CORE) << "BluetoothLinkProvider/clientIdentityReceived: Not an identification package (wuh?)";
+        mSockets.remove(socket->peerAddress());
+        socket->close();
+        socket->deleteLater();
+        return;
+    }
+
+    qCDebug(KDECONNECT_CORE()) << "BluetoothLinkProvider/clientIdentityReceived: Received identity package from " << socket->peerAddress().toString();
+
+    disconnect(socket, SIGNAL(error(QBluetoothSocket::SocketError)), this, SLOT(connectError()));
+
+    const QString& deviceId = receivedPackage.get<QString>("deviceId");
+    BluetoothDeviceLink* deviceLink = new BluetoothDeviceLink(deviceId, this, socket);
+
+    NetworkPackage np2("");
+    NetworkPackage::createIdentityPackage(&np2);
+    success = deviceLink->sendPackage(np2);
+
+    if (success) {
+
+        qCDebug(KDECONNECT_CORE) << "Handshaking done (I'm the new device)";
+
+        connect(deviceLink, SIGNAL(destroyed(QObject*)),
+                this, SLOT(deviceLinkDestroyed(QObject*)));
+
+        Q_EMIT onConnectionReceived(receivedPackage, deviceLink);
+
+        //We kill any possible link from this same device
+        addLink(deviceLink, deviceId);
+
+    } else {
+        // Connection might be lost. Delete it.
+        delete deviceLink;
+    }
+
+    //We don't delete the socket because now it's owned by the BluetoothDeviceLink
+}
+
+//I'm the existing device, a new device is kindly introducing itself.
+void BluetoothLinkProvider::serverNewConnection()
+{
+    QBluetoothSocket* socket = mBluetoothServer->nextPendingConnection();
+
+    qCDebug(KDECONNECT_CORE()) << "BluetoothLinkProvider/serverNewConnection:" << "Received connection from " << socket->peerAddress().toString();
+
+    if (mSockets.contains(socket->peerAddress())) {
+        qCDebug(KDECONNECT_CORE()) << "BluetoothLinkProvider/serverNewConnection: Duplicate connection from " << socket->peerAddress().toString();
+        socket->close();
+        socket->deleteLater();
+        return;
+    }
+
+    connect(socket, SIGNAL(readyRead()), this, SLOT(serverDataReceived()));
+    connect(socket, SIGNAL(error(QBluetoothSocket::SocketError)), this, SLOT(connectError()));
+    connect(socket, SIGNAL(disconnected()), this, SLOT(socketDisconnected()));
+
+    NetworkPackage np2("");
+    NetworkPackage::createIdentityPackage(&np2);
+    socket->write(np2.serialize());
+
+    qCDebug(KDECONNECT_CORE()) << "BluetoothLinkProvider/serverNewConnection: Sent identity package to " << socket->peerAddress().toString();
+
+    mSockets.insert(socket->peerAddress(), socket);
+}
+
+//I'm the existing device and this is the answer to my identity package (data received)
+void BluetoothLinkProvider::serverDataReceived()
+{
+    QBluetoothSocket* socket = qobject_cast<QBluetoothSocket*>(sender());
+    if (!socket) return;
+
+    QByteArray identityArray;
+    while (socket->bytesAvailable() > 0 || !identityArray.contains('\n')) {
+        identityArray += socket->readAll();
+    }
+
+    disconnect(socket, SIGNAL(readyRead()), this, SLOT(serverDataReceived()));
+    disconnect(socket, SIGNAL(error(QBluetoothSocket::SocketError)), this, SLOT(connectError()));
+
+    NetworkPackage receivedPackage("");
+    bool success = NetworkPackage::unserialize(identityArray, &receivedPackage);
+
+    if (!success || receivedPackage.type() != PACKAGE_TYPE_IDENTITY) {
+        qCDebug(KDECONNECT_CORE) << "BluetoothLinkProvider/serverDataReceived: Not an identity package.";
+        mSockets.remove(socket->peerAddress());
+        socket->close();
+        socket->deleteLater();
+        return;
+    }
+
+    qCDebug(KDECONNECT_CORE()) << "BluetoothLinkProvider/serverDataReceived: Received identity package from " << socket->peerAddress().toString();
+
+    const QString& deviceId = receivedPackage.get<QString>("deviceId");
+    BluetoothDeviceLink* deviceLink = new BluetoothDeviceLink(deviceId, this, socket);
+
+    connect(deviceLink, SIGNAL(destroyed(QObject*)),
+            this, SLOT(deviceLinkDestroyed(QObject*)));
+
+    Q_EMIT onConnectionReceived(receivedPackage, deviceLink);
+
+    addLink(deviceLink, deviceId);
+}
+
+void BluetoothLinkProvider::deviceLinkDestroyed(QObject* destroyedDeviceLink)
+{
+    //kDebug(debugArea()) << "deviceLinkDestroyed";
+    const QString id = destroyedDeviceLink->property("deviceId").toString();
+    qCDebug(KDECONNECT_CORE()) << "Device disconnected:" << id;
+    QMap< QString, DeviceLink* >::iterator oldLinkIterator = mLinks.find(id);
+    if (oldLinkIterator != mLinks.end() && oldLinkIterator.value() == destroyedDeviceLink) {
+        mLinks.erase(oldLinkIterator);
+    }
+}
+
+void BluetoothLinkProvider::socketDisconnected()
+{
+    QBluetoothSocket* socket = qobject_cast<QBluetoothSocket*>(sender());
+    if (!socket) return;
+
+    disconnect(socket, SIGNAL(disconnected()), this, SLOT(socketDisconnected()));
+
+    mSockets.remove(mSockets.key(socket));
+}
+
+BluetoothLinkProvider::~BluetoothLinkProvider()
+{
+
+}
diff --git a/core/backends/bluetooth/bluetoothlinkprovider.h b/core/backends/bluetooth/bluetoothlinkprovider.h
new file mode 100644
index 0000000..ee41888
--- /dev/null
+++ b/core/backends/bluetooth/bluetoothlinkprovider.h
@@ -0,0 +1,82 @@
+/**
+ * Copyright 2015 Saikrishna Arcot <saiarcot895@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License or (at your option) version 3 or any later version
+ * accepted by the membership of KDE e.V. (or its successor approved
+ * by the membership of KDE e.V.), which shall act as a proxy
+ * defined in Section 14 of version 3 of the license.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef BLUETOOTHLINKPROVIDER_H
+#define BLUETOOTHLINKPROVIDER_H
+
+#include <QObject>
+#include <QTimer>
+#include <QtBluetooth/QBluetoothAddress>
+#include <QtBluetooth/QBluetoothLocalDevice>
+#include <QtBluetooth/QBluetoothUuid>
+#include <QtBluetooth/QBluetoothServer>
+#include <QtBluetooth/QBluetoothDeviceDiscoveryAgent>
+#include <QtBluetooth/QBluetoothServiceDiscoveryAgent>
+#include <QtBluetooth/QBluetoothSocket>
+
+#include "../linkprovider.h"
+
+class BluetoothDeviceLink;
+
+class BluetoothLinkProvider
+    : public LinkProvider
+{
+    Q_OBJECT
+
+public:
+    BluetoothLinkProvider();
+    ~BluetoothLinkProvider();
+
+    QString name() { return "BluetoothLinkProvider"; }
+    int priority() { return PRIORITY_MEDIUM; }
+public Q_SLOTS:
+    virtual void onNetworkChange(QNetworkSession::State state);
+    virtual void onStart();
+    virtual void onStop();
+    void connectError();
+    void serviceDiscoveryFinished();
+
+private Q_SLOTS:
+    void deviceLinkDestroyed(QObject* destroyedDeviceLink);
+    void socketDisconnected();
+    void connectToPairedDevices();
+    void serverNewConnection();
+    void serverDataReceived();
+    void clientConnected();
+    void clientIdentityReceived();
+
+private:
+    void addLink(BluetoothDeviceLink* deviceLink, const QString& deviceId);
+    QList<QBluetoothAddress> getPairedDevices();
+
+    QBluetoothLocalDevice mDevice;
+    QBluetoothUuid mServiceUuid;
+    QBluetoothServer* mBluetoothServer;
+    QBluetoothServiceInfo mKdeconnectService;
+    QBluetoothServiceDiscoveryAgent* mServiceDiscoveryAgent;
+    QTimer* connectTimer;
+
+    QMap<QString, DeviceLink*> mLinks;
+
+    QMap<QBluetoothAddress, QBluetoothSocket*> mSockets;
+
+};
+
+#endif
diff --git a/core/backends/devicelinereader.cpp b/core/backends/devicelinereader.cpp
new file mode 100644
index 0000000..bba0bda
--- /dev/null
+++ b/core/backends/devicelinereader.cpp
@@ -0,0 +1,55 @@
+/**
+ * Copyright 2013 Albert Vaca <albertvaka@gmail.com>
+ * Copyright 2014 Alejandro Fiestas Olivares <afiestas@kde.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License or (at your option) version 3 or any later version
+ * accepted by the membership of KDE e.V. (or its successor approved
+ * by the membership of KDE e.V.), which shall act as a proxy
+ * defined in Section 14 of version 3 of the license.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "devicelinereader.h"
+
+DeviceLineReader::DeviceLineReader(QIODevice* device, QObject* parent)
+    : QObject(parent)
+    , mDevice(device)
+{
+    connect(mDevice, SIGNAL(readyRead()),
+            this, SLOT(dataReceived()));
+    connect(mDevice, SIGNAL(disconnected()),
+            this, SIGNAL(disconnected()));
+}
+
+void DeviceLineReader::dataReceived()
+{
+    while(mDevice->canReadLine()) {
+        const QByteArray line = mDevice->readLine();
+        if (line.length() > 1) {
+            mPackages.enqueue(line);//we don't want single \n
+        }
+    }
+
+    //If we still have things to read from the device, call dataReceived again
+    //We do this manually because we do not trust readyRead to be emitted again
+    //So we call this method again just in case.
+    if (mDevice->bytesAvailable() > 0) {
+        QMetaObject::invokeMethod(this, "dataReceived", Qt::QueuedConnection);
+        return;
+    }
+
+    //If we have any packages, tell it to the world.
+    if (!mPackages.isEmpty()) {
+        Q_EMIT readyRead();
+    }
+}
diff --git a/core/backends/devicelinereader.h b/core/backends/devicelinereader.h
new file mode 100644
index 0000000..a5255c7
--- /dev/null
+++ b/core/backends/devicelinereader.h
@@ -0,0 +1,59 @@
+/**
+ * Copyright 2013 Albert Vaca <albertvaka@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License or (at your option) version 3 or any later version
+ * accepted by the membership of KDE e.V. (or its successor approved
+ * by the membership of KDE e.V.), which shall act as a proxy
+ * defined in Section 14 of version 3 of the license.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef DEVICELINEREADER_H
+#define DEVICELINEREADER_H
+
+#include <QObject>
+#include <QString>
+#include <QQueue>
+#include <QIODevice>
+
+/*
+ * Encapsulates a QIODevice and implements the same methods of its API that are
+ * used by LanDeviceLink, but readyRead is emitted only when a newline is found.
+ */
+class DeviceLineReader
+    : public QObject
+{
+    Q_OBJECT
+
+public:
+    DeviceLineReader(QIODevice* device, QObject* parent = 0);
+
+    QByteArray readLine() { return mPackages.dequeue(); }
+    qint64 write(const QByteArray& data) { return mDevice->write(data); }
+    qint64 bytesAvailable() { return mPackages.size(); }
+
+Q_SIGNALS:
+    void readyRead();
+    void disconnected();
+
+private Q_SLOTS:
+    void dataReceived();
+
+private:
+    QByteArray lastChunk;
+    QIODevice* mDevice;
+    QQueue<QByteArray> mPackages;
+
+};
+
+#endif
diff --git a/core/daemon.cpp b/core/daemon.cpp
index 3688b4b..d58217d 100644
--- a/core/daemon.cpp
+++ b/core/daemon.cpp
@@ -38,6 +38,7 @@
 #include "core_debug.h"
 #include "dbushelper.h"
 #include "networkpackage.h"
+#include "backends/bluetooth/bluetoothlinkprovider.h"
 #include "backends/lan/lanlinkprovider.h"
 #include "backends/loopback/loopbacklinkprovider.h"
 #include "device.h"
@@ -125,9 +126,10 @@ Daemon::Daemon(QObject *parent)
     QDBusConnection::sessionBus().registerService("org.kde.kdeconnect");
     QDBusConnection::sessionBus().registerObject("/modules/kdeconnect", this, QDBusConnection::ExportScriptableContents);
 
-    //Load backends (hardcoded by now, should be plugins in a future)
-    d->mLinkProviders.insert(new LanLinkProvider());
+    //Load backends
     //d->mLinkProviders.insert(new LoopbackLinkProvider());
+    d->mLinkProviders.insert(new LanLinkProvider());
+    d->mLinkProviders.insert(new BluetoothLinkProvider());
 
     //Read remebered paired devices
     const KConfigGroup& known = config->group("trusted_devices");
diff --git a/core/kdeconnectplugin_config.cpp b/core/kdeconnectplugin_config.cpp
new file mode 100644
index 0000000..c59cd55
--- /dev/null
+++ b/core/kdeconnectplugin_config.cpp
@@ -0,0 +1,49 @@
+/**
+ * Copyright 2013 Albert Vaca <albertvaka@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License or (at your option) version 3 or any later version
+ * accepted by the membership of KDE e.V. (or its successor approved
+ * by the membership of KDE e.V.), which shall act as a proxy
+ * defined in Section 14 of version 3 of the license.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "kdeconnectplugin_config.h"
+#include <kcm/kcm.h>
+
+KdeConnectPluginConfig::KdeConnectPluginConfig(QObject* parent, const QVariantList& args)
+    : KCModule(SftpConfigFactory::componentData(), parent)
+    , mGlobalConfig(KSharedConfig::openConfig("kdeconnect/plugins/pausemusic"))
+{
+    KdeConnectKcm* kcm = 0;
+    QObject* kcmCandidate = parent->parentWidget();
+    while (kcmCandidate) {
+        //qDebug() << kcmCandidate;
+        if (kcmCandidate->objectName() == "KdeConnectKcm") {
+            kcm = qobject_cast<KdeConnectKcm*>(kcmCandidate);
+            break;
+        }
+        kcmCandidate = kcmCandidate->parent();
+    }
+    if (kcm) {
+        kcm->selectedDevice()->id();
+    }
+
+}
+
+KdeConnectPluginConfig::~KdeConnectPluginConfig()
+{
+}
+
+
+
diff --git a/core/kdeconnectplugin_config.h b/core/kdeconnectplugin_config.h
new file mode 100644
index 0000000..e96a800
--- /dev/null
+++ b/core/kdeconnectplugin_config.h
@@ -0,0 +1,49 @@
+/**
+ * Copyright 2013 Albert Vaca <albertvaka@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License or (at your option) version 3 or any later version
+ * accepted by the membership of KDE e.V. (or its successor approved
+ * by the membership of KDE e.V.), which shall act as a proxy
+ * defined in Section 14 of version 3 of the license.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef KDECONNECTPLUGINCONFIG_H
+#define KDECONNECTPLUGINCONFIG_H
+
+#include "kdeconnectcore_export.h"
+#include <kcmodule.h>
+
+struct DeviceDbusInterface;
+
+class KDECONNECTCORE_EXPORT KdeConnectPluginConfig
+    : public KCModule
+{
+    Q_OBJECT
+
+public:
+    KdeConnectPluginConfig(QObject* parent, const QVariantList& args);
+    virtual ~KdeConnectPluginConfig();
+    QString deviceId() { return mDeviceId; }
+
+    //TODO: Add these two to the Plugin as well
+    KSharedConfigPtr deviceConfig() { return mDeviceConfig; }
+    KSharedConfigPtr globalConfig() { return mGlobalConfig; }
+
+private:
+    QString mDeviceId;
+    KSharedConfigPtr mGlobalConfig;
+    KSharedConfigPtr mDeviceConfig;
+};
+
+#endif