File content as of revision 0:722e7ff3a065:

#include "mbed.h"
#include "EthernetInterface.h"

#define WEB_SERVER_PORT   80
char send_dat[1024]={0,};
uint16_t calcu_len(void);

DigitalOut myled(LED1);

int main (void) 
{
    printf("Wait a second...\r\n");
    uint8_t mac_addr[6] = {0x00, 0x08, 0xDC, 0x00, 0x01, 0x02}; 
    const char ip_addr[] = "192.168.0.222"; 
    const char mask_addr[] = "255.255.255.0"; 
    const char gateway_addr[] = "192.168.0.1";
    
    EthernetInterface eth;
    //eth.init(mac_addr); //Use DHCP
    eth.init(mac_addr, ip_addr, mask_addr, gateway_addr); //Use Static
    eth.connect();
    printf("Server IP Address is %s\r\n", eth.getIPAddress());
    
    TCPSocketServer server;
    server.bind(WEB_SERVER_PORT);
    server.listen();

    while (true) 
    {
        printf("Wait for new connection...\r\n");
        TCPSocketConnection client;
        server.accept(client);
        client.set_blocking(false, 15000); // Timeout after (1.5)s
        
        printf("Connection from: %s\r\n", client.get_address());
        char buffer[256];
        char dat[128];
        char *dat_temp;
        
        memset(dat, 0, sizeof(dat));
        memset(send_dat, 0, sizeof(send_dat));
        memset(buffer, 0, sizeof(buffer));
        
        while (true) {
            
            wait(0.5);
            int n = client.receive_all(buffer, sizeof(buffer));
            if (n <= 0) break;
            //buffer[n] = '\0';
            
            printf("rev_dat : %s\r\n", buffer);
    
                       
            if((buffer[0]=='G')&&(buffer[1]=='E')&&(buffer[2]=='T')&&(buffer[3]==' '))// GET_Request
            { 
                if((buffer[13]=='?'))
                {
                    if((buffer[18]=='O')&&(buffer[19]=='F'))
                    {
                        printf("---LED OFF---\r\n");
                        myled = 1;
                        dat_temp = "HTTP/1.1 200 OK\r\n";                           strcat(dat, dat_temp);
                        dat_temp = "Content-Type: text/html\r\n";                   strcat(dat, dat_temp);
                        dat_temp = "Connection: close\r\n";                         strcat(dat, dat_temp);
  
                        sprintf(dat, "%sContent-Length: %d\r\n", dat, calcu_len());     strcat(dat, dat_temp);
                    
                        client.send(dat, strlen(dat));
                        printf("send_dat : %s\r\n", dat);
                    
                        client.send(send_dat, sizeof(send_dat));   
                        printf("send_dat : %s\r\n", send_dat);
                        
                        memset(dat, 0, sizeof(dat));
                        memset(send_dat, 0, sizeof(send_dat));
                        memset(buffer, 0, sizeof(buffer));
                    }
                    else
                    {
                        printf("---LED ON---\r\n");
                        myled = 0;
                        dat_temp = "HTTP/1.1 200 OK\r\n";                           strcat(dat, dat_temp);
                        dat_temp = "Content-Type: text/html\r\n";                   strcat(dat, dat_temp);
                        dat_temp = "Connection: close\r\n";                         strcat(dat, dat_temp);

                        sprintf(dat, "%sContent-Length: %d\r\n", dat, calcu_len());     strcat(dat, dat_temp);
                    
                        client.send(dat, strlen(dat));
                        printf("send_dat : %s\r\n", dat);
                    
                        client.send(send_dat, sizeof(send_dat));   
                        printf("send_dat : %s\r\n", send_dat);
                        
                        memset(dat, 0, sizeof(dat));
                        memset(send_dat, 0, sizeof(send_dat));
                        memset(buffer, 0, sizeof(buffer));
                    }                    
                }

                else
                {
                    dat_temp = "HTTP/1.1 200 OK\r\n";                           strcat(dat, dat_temp);
                    dat_temp = "Content-Type: text/html\r\n";                   strcat(dat, dat_temp);
                    dat_temp = "Connection: close\r\n";                         strcat(dat, dat_temp);
                    //len = calcu_len();
                    sprintf(dat, "%sContent-Length: %d\r\n", dat, calcu_len());     strcat(dat, dat_temp);
                
                    client.send(dat, strlen(dat));
                    printf("send_dat : %s\r\n", dat);
                
                    client.send(send_dat, sizeof(send_dat));   
                    printf("send_dat : %s\r\n", send_dat);
                    
                    memset(dat, 0, sizeof(dat));
                    memset(send_dat, 0, sizeof(send_dat));
                    memset(buffer, 0, sizeof(buffer));
                }
            }
            
        }
        
        client.close();
    }
    
}
uint16_t calcu_len(void)
{
    char * dat_temp;
    
    dat_temp = "<html>\r\n"\
                "<body>\r\n"\
                "<a href='led.html?LED=ON'>LED ON</a>\r\n"\
                "<br>\r\n"\
                "<a href='led.html?LED=OFF'>LED OFF</a>\r\n"\
                "<body>\r\n"\                                                                           
                "<html>\r\n";
    strcat(send_dat, dat_temp);
    return strlen(send_dat);
}