File content as of revision 1:7350a2598a80:

#include "mbed.h"
#include "EthernetNetIf.h"
#include "TCPSocket.h"
#include "SocketUtil.h"

EthernetNetIf eth;
DigitalOut led1(LED1);

TCPSocket tcp;   //The listening port where requests are queued
TCPSocket* link; //The port where accepted requests can communicate
Host local(IpAddr(), 1234); // mbed
Host client;

void onLinkSocketEvent(TCPSocketEvent e) {
    SocketEvent event = e;
    printf(event);

    switch (event) {
        case TCPSOCKET_READABLE:
            char buf[128];
            while (int len = link->recv(buf, 128)) {
                // And send straight back out again
                link->send(buf, len);
                buf[len] = 0; // make terminater
                printf("Received & Wrote: %s\n",buf);
            }
            break;
        case TCPSOCKET_DISCONNECTED:
            link->close();
            break;
    }
}

void onTCPSocketEvent(TCPSocketEvent e) {
    SocketEvent event = e;
    printf(event);

    switch (event) {
        case TCPSOCKET_ACCEPT:
            if (SocketError err = tcp.accept(&client, &link)) {
                printf(err);
            } else {
                link->setOnEvent(&onLinkSocketEvent);
                IpAddr ip = client.getIp();
                printf("Incoming TCP connection from %d.%d.%d.%d\r\n", ip[0], ip[1], ip[2], ip[3]);
            }
            break;

        case TCPSOCKET_DISCONNECTED:
            tcp.close();
            break;
    }
}

int main() {
    //Basic setup
    printf("Welcome to wireFUSE\n");
    printf("Setting up...\n");
    EthernetErr ethErr = eth.setup();
    if (ethErr)
        error("Error %d in setup.\n", ethErr);
    printf("Setup OK\n");

    tcp.setOnEvent(&onTCPSocketEvent);

    //Bind to local port
    SocketError bindErr = tcp.bind(local);
    printf("Init bind... %s", (char *) bindErr);

    //Listen to local port
    TCPSocketErr listenErr = tcp.listen();
    printf("Init listen... %s", (char *)listenErr);
    
    Timer timer;
    timer.start();
    while (true) {
        Net::poll();
        if (timer.read() > 10) {
            timer.reset();
            led1 = !led1; //Show that we are alive
            printf("waiting for client on port 1234\n");
        }
    }
}