oskarvitaliiandClaude Opus 4.8
ea0256a5b9
This LAN's router does not resolve external hostnames, so NTP uses hard-coded Cloudflare/Google anycast IPs instead of names. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
43 lines
1.2 KiB
C++
43 lines
1.2 KiB
C++
#include <RTClib.h>
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#include <time.h>
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#include <ESP8266WiFi.h>
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#include "config.h"
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#include "rtc_time.h"
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static RTC_DS3231 rtc;
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bool rtcBegin() { return rtc.begin(); }
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bool rtcLostPower() { return rtc.lostPower(); }
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RtcTime rtcNow() {
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DateTime n = rtc.now();
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return RtcTime{ n.year(), n.month(), n.day(), n.hour(), n.minute(), n.second() };
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}
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void rtcSet(const RtcTime& t) {
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rtc.adjust(DateTime(t.year, t.month, t.day, t.hour, t.minute, t.second));
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}
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uint32_t rtcEpoch() {
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return rtc.now().unixtime();
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}
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bool ntpSync(int tzOffsetMin) {
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// NTP servers by IP to bypass DNS (this network doesn't resolve names reliably).
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// Cloudflare (162.159.200.123) and Google (216.239.35.0/.4) are stable anycast.
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configTime(tzOffsetMin * 60, 0, "162.159.200.123", "216.239.35.0", "216.239.35.4");
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time_t now = time(nullptr);
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int tries = 0;
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while (now < 1700000000 && tries < 120) { // up to ~30 s
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delay(250);
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now = time(nullptr);
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tries++;
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}
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if (now < 1700000000) return false;
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struct tm* lt = localtime(&now);
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rtcSet(RtcTime{ (uint16_t)(lt->tm_year + 1900), (uint8_t)(lt->tm_mon + 1),
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(uint8_t)lt->tm_mday, (uint8_t)lt->tm_hour,
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(uint8_t)lt->tm_min, (uint8_t)lt->tm_sec });
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return true;
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}
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