Simple UDP connection that transfers message using packets

[paupav]

So, I don't know why this isn't working. I've read some documentation and I've made this code. Both server and client are ran on the same machine.
SERVER

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///////SERVER
#include <iostream>
#include <SFML/Network.hpp>
#include <string>

using namespace std;

int main()
{

    sf::UdpSocket socket;
    sf::Packet packet;
    sf::Time time;
    sf::Clock clock;
    int i = 0;
    std::string hello = "Hello World!";
    packet << hello;

// bind the socket to a port
    socket.bind(4000);


    sf::IpAddress recipient = sf::IpAddress::getPublicAddress();
    unsigned short port = 5400;
    while(i == 0)
    {
        time = clock.getElapsedTime();
        if(time.asSeconds() >= 2)
        {
            std::cout << "Sent to: " << recipient << ":" << port << std::endl;
            clock.restart();
            socket.send(packet, recipient, port);
        }
    }

    std::cout << "Adress: " << recipient << std::endl;
    return 0;
}

CLIENT:

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/////////////CLIENT
#include <iostream>
#include <SFML/Network.hpp>
#include <string>


int main()
{
    sf::UdpSocket socket;
    sf::Packet packet;
    sf::IpAddress sender;
    unsigned short senderPort, socketPort;
    socketPort = 5400;
    socket.bind(socketPort);
    std::string hello;
    std::cout << sf::IpAddress::getPublicAddress() <<":"<< socketPort << std::endl;

    socket.receive(packet, sender, senderPort);
    packet >> hello;
    std::cout << "received: " << hello << std::endl;
}

[Laurent]

Using your public IP, the packet will go through your router, the public internet and then back to your router and finally to your PC. So it will most likely be blocked.

If you run it locally, either use your private address or localhost.

[paupav]

Thanks