ESP8266 Basic SNTP (non-os sdk)

#include "osapi.h"
#include "user_interface.h"

#define INFO( format, ... ) os_printf( format, ## __VA_ARGS__ )

LOCAL os_timer_t ntp_timer;

LOCAL char ssid[32] = "ssidthingy";
LOCAL char password[64] = "passwordthingy";

uint32 ICACHE_FLASH_ATTR user_rf_cal_sector_set(void)
{
    return 1019;
}

void NTPTimer(void* arg)
{
    static uint8_t cnt = 50;

    uint32 current_stamp;
    current_stamp = sntp_get_current_timestamp();
    if (current_stamp == 0 && cnt > 0)
    {
        cnt--;
        os_timer_arm(&ntp_timer, 100, 0);
    }
    else
    {
        INFO("Current timestamp (%d): %d - %s", cnt, current_stamp, sntp_get_real_time(current_stamp));
    }
}

void ICACHE_FLASH_ATTR mywifi_handle_events(System_Event_t *evt)
{
    switch (evt->event)
    {
        case EVENT_STAMODE_CONNECTED:
        {
            break;
        }
        case EVENT_STAMODE_DISCONNECTED:
        {
            break;
        }
        case EVENT_STAMODE_GOT_IP:
        {
            sntp_init();
            os_timer_arm(&ntp_timer, 100, 0);
        }
    }
}

void ICACHE_FLASH_ATTR user_init(void)
{
    gpio_init();

    uart_init(74880, 74880);

    struct station_config stConf;
    os_memcpy(&stConf.ssid, ssid, 32);
    os_memcpy(&stConf.password, password, 64);

    wifi_set_event_handler_cb(mywifi_handle_events);
    wifi_set_opmode_current(STATION_MODE);
    wifi_station_set_config(&stConf);
    wifi_set_sleep_type(NONE_SLEEP_T);

    os_timer_disarm(&ntp_timer);
    os_timer_setfn(&ntp_timer, (os_timer_func_t *)NTPTimer, NULL);

    sntp_setservername(0, "0.ca.pool.ntp.org"); // set server 0 by domain name
    sntp_setservername(1, "1.ca.pool.ntp.org"); // set server 1 by domain name
    sntp_setservername(2, "2.ca.pool.ntp.org"); // set server 2 by domain name
}