File content as of revision 0:e221363f7942:

// Software Update via Ethernet from forum - 
// http://mbed.org/forum/mbed/topic/1183/
#include "mbed.h"
#include "SWUpdate.h"
#include "HTTPClient.h"
#include "HTTPText.h"
#include "HTTPFile.h"
#include <stdio.h>

extern "C" void mbed_reset();

#define DEBUG "SWup"
#include <cstdio>
#if (defined(DEBUG) && !defined(TARGET_LPC11U24))
#define DBG(x, ...)  std::printf("[DBG %s %3d] "x"\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
#define WARN(x, ...) std::printf("[WRN %s %3d] "x"\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
#define ERR(x, ...)  std::printf("[ERR %s %3d] "x"\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
#define INFO(x, ...) std::printf("[INF %s %3d] "x"\r\n", DEBUG, __LINE__, ##__VA_ARGS__);
#else
#define DBG(x, ...)
#define WARN(x, ...)
#define ERR(x, ...)
#define INFO(x, ...)
#endif

bool SoftwareUpdate(const char *url, const char * name, Reboot_T reboot) {
    HTTPClient http;
    //http.setTimeout( 15000 ); 
    char fqurl[150];    // fully qualified url
    char verfn[32];     // local version file
    char fwfn[32];
    bool result = false;    // many things can go wrong, assume failure
    //char *verfn = "/local/VERSION.TXT";
    char buf[50];
        
    INFO("SoftwareUpdate(%s,%s)", url, name);
    snprintf(verfn, 32, "/local/%s.ver", name);

    /* Read installed version string */
    int inst_ver = -1;
    FILE *fv = fopen(verfn, "r");
    if (fv) {
        fscanf(fv, "%d", &inst_ver);
        fclose(fv);
    }
    INFO("  Installed version: %d", inst_ver);
    
    /* Download latest version string */
    HTTPText server_ver("test message");
    snprintf(fqurl, 150, "%s/%s.txt", url, name);
    HTTPResult r = http.get(fqurl, buf, sizeof(buf));
    if (r == HTTP_OK) {
        int latest_ver = -1;
        INFO("  read {%s}", buf);
        sscanf(buf, "%d", &latest_ver);
        INFO("  web version: %d", latest_ver);
        if (inst_ver != latest_ver) {
            INFO("  Downloading new firmware...");
            sprintf(fwfn, "/local/%s%d.BIN", name, latest_ver);
            snprintf(fqurl, 150, "%s/%s.bin", url, name);
    
            HTTPFile latest(fwfn);
            r = http.get(fqurl, &latest);
            if (r == HTTP_OK) {
                sprintf(fwfn, "/local/%s%d.BIN", name, inst_ver);
                INFO("  Firmware downloaded, removing old version (%s).", fwfn);
//                if (remove(fwfn)) {
                    ERR("  *** Failed to remove old version. ***");
//                }
                INFO("Updating stored version number.");
                fv = fopen(verfn, "w");
                if (fv) {
                    int fr = fputs(buf, fv);
                    if (fr < 0) {
                        ERR("Failed (%d) to update stored version number.", fr);
                        fclose( fv );
                    } else {
                        fclose( fv );
                        if (reboot == AUTO_REBOOT) {
                            WARN("Resetting...\n");
                            wait_ms(200);
                            mbed_reset();
                        }
                        result = true;
                    }
                }
            } else {
                WARN("Couldn't download lastest firmware.\n");
            }
        }
    } else {
        WARN("Couldn't check latest firmware version.\n");
    }
    return result;
}