lwip/contrib/examples/sntp/sntp_example.c

/*
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
 * OF SUCH DAMAGE.
 *
 * This file is part of the lwIP TCP/IP stack.
 * 
 * Author: Dirk Ziegelmeier <dziegel@gmx.de>
 *
 */

#include <time.h>

#include "lwip/opt.h"
#include "lwip/apps/sntp.h"
#include "sntp_example.h"
#include "lwip/netif.h"

void
sntp_set_system_time(u32_t sec)
{
  char buf[32];
  struct tm current_time_val;
  time_t current_time = (time_t)sec;

#ifdef _MSC_VER
  localtime_s(&current_time_val, &current_time);
#else
  localtime_r(&current_time, &current_time_val);
#endif
  
  strftime(buf, sizeof(buf), "%d.%m.%Y %H:%M:%S", &current_time_val);
  printf("SNTP time: %s\n", buf);
}

void
sntp_example_init(void)
{
  sntp_setoperatingmode(SNTP_OPMODE_POLL);
#if LWIP_DHCP
  sntp_servermode_dhcp(1); /* get SNTP server via DHCP */
#else /* LWIP_DHCP */
#if LWIP_IPV4
  sntp_setserver(0, netif_ip_gw4(netif_default));
#endif /* LWIP_IPV4 */
#endif /* LWIP_DHCP */
  sntp_init();
}