Peer-to-peer over Internet on Qt

Question

I need to make peer-to-peer communication between applications.

The applications also shall find each other automatically in internet. For this, among other things, I need to overcome NAT Traversal, etc.

As example, I need to use the communication something like following:

InternetPeer peer;

peer.setName("my_name");

peer.listen(); // accept connections
peer.startSearchForOthers(); // find another peers

connect(&peer, &InternetPeer::newConnection, this, ...);

connect(&peer, &InternetPeer::anotherPeerFound, this, ...);

QStringList peerNames = peer.availablePeers();

peer.sendMessage(peerNames.at(0), "Hello");

peer.close();

Then it would be good to have some way to access such a connection with QTcpSocket or QUdpSocket.

How this can be done on Qt and c++?