I have recently been looking into syncing time on an esp32, and managed to follow some guides to get the esp32 to sync with NTP using configTime().
However, as I am looking to get milisecond accuracy timestamps, I was wondering if there was any way to get the detailed diagnostic data, e.g. Jitter, offset and delay. After searching for a while, I have tried looking into esp_netif and Iwif sntp, but I could not find anything regarding NTP diagnostic, so I am not sure if I am looking in the right place.
Any advice would be greatly appreciated!
Getting detailed NTP Diagnostic data
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- Posts: 826
- Joined: Mon Jul 22, 2019 3:20 pm
Re: Getting detailed NTP Diagnostic data
Client side or server? I have an ntpd (although it isn't very good) in my repos as well.
Code: Select all
#include <WiFiUdp.h>
timeval sntpTime() {
WiFiUDP udp;
uint64_t sec = 0;
uint64_t fractional = 0;
uint8_t sendPacket[48] = {0};
sendPacket[0] = 0x1B;
udp.begin(123);
udp.beginPacket(NTP_SRV, 123);
udp.write(sendPacket, 48);
udp.endPacket();
for (int z=0; z<60; z++) {
delay(500);
if (udp.parsePacket()) { // we've got a packet
byte recvPacket[48];
if (udp.read(recvPacket, 48) == 48) {
udp.stop();
for (int x=0; x<4; x++) sec += (uint64_t)recvPacket[40+x] << ((3-x)*8);
sec -= 2208988800L;
// We only need micros, so ignore the last packet of fractional
for (int x=0; x<3; x++) fractional += (uint64_t)recvPacket[44+x] << ((2-x)*8);
fractional = fractional * 1000000 / (1ULL<<24);
return (timeval){(long int)sec, (long int)fractional};
}
}
}
return (timeval){0, 0};
}
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