LWIP SNTP, what does it actually do?

[richardh]

I am looking in to implimenting a SNTP client on an embedded board, I am using the STM32CubeIDE so its a checkbox to enable SNTP, but I can find no documentation or examples on what you do from there.

I can see functions to enable/disable SNTP, but not to read anything or write anything....

Does anyone have some pointers about what/how it works? or even an example?

I have hunted the web, lots say how easy it is, just look at RFC4330 (which I have) etc, but I can only presume I am missing something completely.

[richardh]

yes please.

[QRobe.1]

This one uses the RTC : https://blog.csdn.net/hxj0323/article/details/108304576

And this one uses some tcp echo server : https://blog.csdn.net/zhanglifu3601881/article/details/90145016

Hope you can find a lead !

[AJohn.14]

Edited:

Is this still open ?

Please guide me to get more info or a straight forward example.

Thanks in advance.

[Piranha]

https://stackoverflow.com/questions/61932743/how-does-the-sntp-app-of-the-lwip-component-set-the-time-it-receives

https://www.nongnu.org/lwip/2_1_x/group__sntp__opts.html#gafe340b98c52dedcbc041267fe13b2da6

[AJohn.14]

Hi all,

First of all thanks to all of you and a big one to @Piranha​. I am able to make it work.

But still I have issues.

I am able to get correct MM:SS and Month.

HH and Date I adjusted.

Year not able to fix.

See below,

/**
 * @brief set time from STNP
 */
void ethernet_task_SetTimestamp(uint32_t seconds, uint32_t fractional)
{
	ethernet_task_timestamp 		= seconds;
	ethernet_task_timestampValid 	= 1;
	ethernet_task_timestampOffset 	= HAL_GetTick();
	ethernet_task_timestampms 		= 1000 * (uint64_t)seconds + fractional / 4294967;
	ethernet_task_timestampCount++;
 
	common_TimeDateClass timeDate;
 
	time_t unixTimestamp 	= (time_t)(ethernet_task_timestampms / 1000);
	struct tm* timeinfo 	= gmtime(&unixTimestamp);  	// or localtime(&unixTimestamp) for local time
 
	timeDate.date.year 		= timeinfo->tm_year + 1900; // Years since 1900
	timeDate.date.month 	= static_cast<common_DateMonthEnum>(timeinfo->tm_mon + 1); // Months since January (0-11)
	timeDate.date.date 		= timeinfo->tm_mday + 1;    // Day of the month (1-31)
	timeDate.time.hour 		= timeinfo->tm_hour + 1;    // Hours since midnight (0-23)
	timeDate.time.minute 	= timeinfo->tm_min;         // Minutes after the hour (0-59)
	timeDate.time.second 	= timeinfo->tm_sec;         // Seconds after the minute (0-61)
 
	commonAPI_SetTime_SNTP(&timeDate.time);		// RTC write time
	commonAPI_SetDate_SNTP(&timeDate.date);		// RTC write date
 
}

above is my

SNTP_SET_SYSTEM_TIME_NTP()

function. But it has following adjustments.

	timeDate.date.year 		= timeinfo->tm_year + 1900; // Years since 1900
 
	timeDate.date.date 		= timeinfo->tm_mday + 1;    // Day of the month (1-31)
	timeDate.time.hour 		= timeinfo->tm_hour + 1;    // Hours since midnight (0-23)

As I mentioned already, for 'date' and 'HH' I added addtional value '1' to the orginal value. and for year I am getting '2065' for '2023'.

Kindly advice what am doing wrong.

Thanks in advance.