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Subsecond accuracy NTP

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cschwinne
2021-05-24 19:05:34 +02:00
parent b455f432d5
commit 852f758be3
4 changed files with 17 additions and 10 deletions
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13
wled00/ntp.cpp
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@@ -192,16 +192,21 @@ bool checkNTPResponse()
Toki::Time arrived = toki.fromNTP(pbuf + 32);
Toki::Time departed = toki.fromNTP(pbuf + 40);
//basic half roundtrip estimation
uint32_t offset = (ntpPacketReceivedTime - ntpPacketSentTime - toki.msDifference(arrived, departed)) >> 1;
offset += millis() - ntpPacketReceivedTime +1;
uint32_t serverDelay = toki.msDifference(arrived, departed);
uint32_t offset = (ntpPacketReceivedTime - ntpPacketSentTime - serverDelay) >> 1;
toki.printTime(departed);
toki.adjust(departed, offset);
toki.setTime(departed);
Serial.print("Arrived: ");
toki.printTime(arrived);
Serial.print("Time: ");
toki.printTime(departed);
Serial.print("Roundtrip: ");
Serial.println(ntpPacketReceivedTime - ntpPacketSentTime);
Serial.print("Offset: ");
Serial.println(offset);
Serial.print("Time: ");
toki.printTime(toki.getTime());
Serial.print("Serverdelay: ");
Serial.println(serverDelay);
DEBUG_PRINT(F("Unix time = "));
uint32_t epoch = toki.second();