Unable to connect bluetooth socket to device

qvazar

I'm trying to establish bluetooth connection between laptop and Samsung Smart Touch Remote. My issue is that I can't connect socket to device(socket is always in "Service lookup state"):
@
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
// Create a discovery agent and connect to its signals
QBluetoothDeviceDiscoveryAgent *discoveryAgent = new QBluetoothDeviceDiscoveryAgent(this);
connect(discoveryAgent, SIGNAL(deviceDiscovered(const QBluetoothDeviceInfo&)),
this, SLOT(deviceDiscovered(const QBluetoothDeviceInfo&)));

// Start a discovery
discoveryAgent->start();

}

void MainWindow::deviceDiscovered(const QBluetoothDeviceInfo &device)
{
socket = new QBluetoothSocket(QBluetoothServiceInfo::RfcommProtocol, this);
socket->connectToService(QBluetoothAddress(device.address()),
QBluetoothUuid(QBluetoothUuid::SerialPort));
connect(socket, SIGNAL(error(QBluetoothSocket::SocketError)),
this, SLOT(socketError(QBluetoothSocket::SocketError)));
connect(socket, SIGNAL(connected()), this, SLOT(socketConnected()));
connect(socket, SIGNAL(disconnected()), this, SLOT(socketDisconnected()));
connect(socket, SIGNAL(readyRead()), this, SLOT(socketRead()));
connect(socket, SIGNAL(stateChanged(QBluetoothSocket::SocketState)), this, SLOT(socketStateChanged()));
}

void MainWindow::socketRead()
{
QByteArray receivedData = socket->readAll();
QMessageBox msg;
msg.setText(QString(receivedData));
msg.exec();
}

void MainWindow::socketConnected()
{
qDebug() << "Socket connected";
qDebug() << "Local: "
<< socket->localName()
<< socket->localAddress().toString()
<< socket->localPort();
qDebug() << "Peer: "
<< socket->peerName()
<< socket->peerAddress().toString()
<< socket->peerPort();
}

void MainWindow::socketDisconnected()
{
qDebug() << "Socket disconnected";
socket->deleteLater();
}

void MainWindow::socketError(QBluetoothSocket::SocketError error)
{
qDebug() << "Socket error: " << error;
}

void MainWindow::socketStateChanged()
{
int socketState = socket->state();
QMessageBox msg;
if(socketState == QAbstractSocket::UnconnectedState)
{
msg.setText("unconnected");
}
else if(socketState == QAbstractSocket::HostLookupState)
{
msg.setText("host lookup");
}
else if(socketState == QAbstractSocket::ConnectingState )
{
msg.setText("connecting");
}
else if(socketState == QAbstractSocket::ConnectedState)
{
msg.setText("connected");
}
else if(socketState == QAbstractSocket::BoundState)
{
msg.setText("bound");
}
else if(socketState == QAbstractSocket::ClosingState)
{
msg.setText("closing");
}
else if(socketState == QAbstractSocket::ListeningState)
{
msg.setText("listening");
}
msg.exec();
}
@

SGaist

Hi and welcome to devnet,

Which OS/Qt are you running your code on ?

qvazar

Hi,
I'm running my code on Ubuntu 13.10, Qt 5.2.1.

SGaist

Have you already paired the remote and your computer ?

qvazar

Yes, both remote device and computer are paired, and I can discover device and get any information about it in my program, but I can't establish socket connection between them.

SGaist

Might be a stupid question but are you sure your remote supports RfcommProtocol ?

qvazar

This is not a stupid question because I'm not sure that device supports Rfcomm protocol, but I guess it should. Also, I tried to create a socket this way:
socket = new QBluetoothSocket(QBluetoothServiceInfo::L2capProtocol, this);
But it didn't work either.

SGaist

No information about that in the remote documentation ?

qvazar

Unfortunately, I didn't find anything.