void initEthernet(uint8_t* mac_addr) {
    int phy_link;

    eth.init(mac_addr); //Use DHCP
    
    eth.connect();
        
    /* phy link */
    do{
       phy_link = eth.ethernet_link();
       printf(".");
       wait(2);
    }while(!phy_link);
    printf("\r\n");
         
    printf("IP Address is %s\r\n", eth.getIPAddress());
}

void requestHTTP(void)
{
    char req_buf[256];
    
    /* TCP socket connect */   
    sock.connect(WEB_SERVER, 80);
    
    /* Request to WEB Server using HTTP */
    sprintf(req_buf,"GET /data/2.5/weather?q=%s,%s&appid=%s HTTP/1.1\nHost: %s\nConnection: close\n\n",
        CITY,COUNTRY, API_KEY, WEB_SERVER);
    sock.send_all(req_buf, strlen(req_buf));
}

void parsingGetData(void)
{
    char buffer[1024];
        
    /* get info */
    int ret;
    while (true) {
        ret = sock.receive_all(buffer, sizeof(buffer)-1);
        if (ret <= 0) break;
        buffer[ret] = '\0';
        pc.printf("Received %d chars from server: %s\n", ret, buffer);     
    }
    
    /* parsing weather, city, tempurature */
    char *weather;
    char *city;
    char *temp;
    uint8_t i;
    
    pc.printf("\r\n\r\n======== WeatherForecast ========\r\n");  
    weather = strstr(buffer, "main");
    pc.printf("\t State : ");
    for(i = 7; i < 20; i++)
    {
        if(*(weather+i) == '\"') break;
        pc.printf("%c", *(weather+i));
    }
            
    city = strstr(buffer, "name");
    pc.printf("\r\n\t City : ");
    for(i = 7; i < 20; i++)
    {
        if(*(city+i) == '\"') break;
        pc.printf("%c", *(city+i));
    }
        
    temp = strstr(buffer, "temp");
    pc.printf("\r\n\t temp(kelvin) : ");
    for(i = 6; i < 12; i++)
    {
        if((*(temp+i) == '\"')||(*(temp+i) == ',')) break;
        pc.printf("%c", *(temp+i));
    }
    pc.printf("\r\n\r\n");
}