How to get network/internet speed?

[darshan.hardas]

I have to upload/download the files/data to the server using sockets.
Based on the internet speed I have to decide between TCP and UDP socket connection to be used for the operations.

Please help me out as how to get the internet speed?

Thanks in advance.

[Achayan]

I know there is a lib for this https://github.com/teeks99/speed_check, I think it will help you to figure out your situatuon with this. And this also https://github.com/wardi/speedometer , http://excess.org/speedometer/

[darshan.hardas]

I am looking for a Qt or C++ implementation rather than executing any script.

[wysota]

The only way to check the connection speed is to actually try and transmit something. Just be aware that there may be some traffic management involved and speed for TCP and UDP or even speed of the same protocol but using different ports might be different.

[darshan.hardas]

Yes.. I have read on some other forums and also have checked the QtNetworkMonitor project.

After successful connection with the server (TCP/UDP), the file is uploaded and speed is calculated as:

speed = (bytes of data) / (time elapsed)

Can you please suggest a way to reach to the max bytes for the connection made with the server? As of now I am more concerned about the TCP connection.

[wysota]

What do you mean by "max bytes for the connection"?

[darshan.hardas]

I tried sending the packets over the TCP connection say of size 1KB. Below is the sample function

void checkBandwidth() 
{
        QTcpSocket bandWidthSock;
        int port = 1000;
	bandWidthSock.connectToHost("host", port);	//connect to server to check bandwidth
 
	if(bandWidthSock.waitForConnected()) 
	{
		QTime time;
 
		QFile file("dump.txt");
		if(!file.open(QFile::ReadOnly))
		{
			qDebug() << "Unable to read file: " << file.fileName();
			return;
		}
 
		QString strFileData = file.readAll();
                file.close();
 
		quint64 bytesWritten ;
		QString strData;
 
		time.start();
		qDebug() << "bytesAvailable: " << bandWidthSock.bytesToWrite();
 
		while(!bandWidthSock.bytesAvailable())
		{
			strData += strFileData;
			qDebug() << "bytesAvailable: " << bandWidthSock.bytesToWrite() << " writing: " << strData.length();
 
			time.restart();
			bytesWritten = bandWidthSock.write(strData.toStdString().c_str(), strlen(strData.toStdString().c_str()));
		}
 
		int uploadTime = time.elapsed();
		int speed = (((int)bytesWritten)*(1000 )) / uploadTime;
 
		QString strDisplay("bytes written: ");
		strDisplay.append(QString::number(bytesWritten));
		strDisplay.append("\nupload time: ");
		strDisplay.append(QString::number(uploadTime));
		strDisplay.append("\nSpeed: ");
		strDisplay.append(QString::number(speed));
 
		QMessageBox::information(0, "test", strDisplay);
 
	}
 
	bandWidthSock.disconnectFromHost();
	bandWidthSock.close();
}

void checkBandwidth() 
{
        QTcpSocket bandWidthSock;
        int port = 1000;
	bandWidthSock.connectToHost("host", port);	//connect to server to check bandwidth

	if(bandWidthSock.waitForConnected()) 
	{
		QTime time;

		QFile file("dump.txt");
		if(!file.open(QFile::ReadOnly))
		{
			qDebug() << "Unable to read file: " << file.fileName();
			return;
		}

		QString strFileData = file.readAll();
                file.close();

		quint64 bytesWritten ;
		QString strData;

		time.start();
		qDebug() << "bytesAvailable: " << bandWidthSock.bytesToWrite();

		while(!bandWidthSock.bytesAvailable())
		{
			strData += strFileData;
			qDebug() << "bytesAvailable: " << bandWidthSock.bytesToWrite() << " writing: " << strData.length();
			
			time.restart();
			bytesWritten = bandWidthSock.write(strData.toStdString().c_str(), strlen(strData.toStdString().c_str()));
		}

		int uploadTime = time.elapsed();
		int speed = (((int)bytesWritten)*(1000 )) / uploadTime;
		
		QString strDisplay("bytes written: ");
		strDisplay.append(QString::number(bytesWritten));
		strDisplay.append("\nupload time: ");
		strDisplay.append(QString::number(uploadTime));
		strDisplay.append("\nSpeed: ");
		strDisplay.append(QString::number(speed));

		QMessageBox::information(0, "test", strDisplay);

	}

	bandWidthSock.disconnectFromHost();
	bandWidthSock.close();
}

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I am increasing the data written on the socket if the availableBytes() are 0. But the app goes into the endless loop.
Please let me know you comments.

[wysota]

bytesAvailable() returns the number of bytes available for reading, thus you always get 0 there.