What is the easiest to make the Internet connection on Qt (Easy Connect Manager for 3G modem)?

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Modem 3G is connected to a serial port. I can send AT commands using QtSerialPort and make the Internet connection of the modem. But I do not know how to make on Qt the internet connection, so that the installed programs on my PC can use the Internet connection 3G modem. Please give me an example of working code.

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