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基于例程中SNTP接口实现获取网络时间戳后，发现精度只能到秒级，SNTP是否有获取毫秒级时间的办法呢？
// update 'now' variable with current time
time(&now);
// Set timezone to China Standard Time
setenv("TZ", "CST-8", 1);
tzset();
localtime_r(&now, &timeinfo);
strftime(strftime_buf, sizeof(strftime_buf), "%c", &timeinfo);
ESP_LOGI(TAG, "The current date/time in Shanghai is: %s", strftime_buf);
ESP_LOGI(TAG, "timestamp = %ld", now);

long long platform_tick_get_ms(void)
{
struct timeval te;
gettimeofday(&te, NULL); // get current time
long long milliseconds = te.tv_sec * 1000LL + te.tv_usec / 1000; // calculate milliseconds
// printf("milliseconds: %lld\n", milliseconds);
return milliseconds;
}

感谢，已解决，原来是类型长度没定义好。