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libraries/M5UnitUnified/examples/demo/MultipleUnits/main/config_time.cpp

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+/*
+ * SPDX-FileCopyrightText: 2024 M5Stack Technology CO LTD
+ *
+ * SPDX-License-Identifier: MIT
+ */
+/*!
+  @brief Configrate time
+  @file config_time.cpp
+*/
+#include "config_time.hpp"
+#include <M5Unified.h>
+#include <M5Utility.h>
+#include <WiFi.h>
+#include <esp_sntp.h>
+#include <random>
+#include <algorithm>
+
+namespace {
+// NTP server URI
+constexpr char ntp0[]     = "ntp.nict.jp";
+constexpr char ntp1[]     = "ntp.jst.mfeed.ad.jp";
+constexpr char ntp2[]     = "time.cloudflare.com";
+const char* ntpURLTable[] = {ntp0, ntp1, ntp2};
+
+constexpr char defaultPosixTZ[] = "JST-9";  // Asia/Tokyo
+
+auto rng = std::default_random_engine{};
+}  // namespace
+
+bool isEnabledRTC()
+{
+    // Check RTC if exists
+    if (M5.Rtc.isEnabled()) {
+        auto dt = M5.Rtc.getDateTime();  // GMT
+        if (dt.date.year > 2016) {
+            M5_LOGV("RTC time already set. (GMT) %04d/%02d/%2d %02d:%02d:%02d", dt.date.year, dt.date.month,
+                    dt.date.date, dt.time.hours, dt.time.minutes, dt.time.seconds);
+            return true;
+        }
+        M5_LOGW("RTC is not set to the correct time");
+    }
+    return false;
+}
+
+void setTimezone(const char* posix_tz)
+{
+    setenv("TZ", posix_tz ? posix_tz : defaultPosixTZ, 1);
+    tzset();
+}
+
+bool configTime(const char* posix_tz, const char* ssid, const char* password)
+{
+    M5_LOGI("Configrate time");
+
+    // WiFi connect
+    if (ssid && password) {
+        WiFi.begin(ssid, password);
+    } else {
+        // Connect to credential in Hardware. (ESP32 saves the last WiFi connection)
+        WiFi.begin();
+    }
+    int32_t retry{10};
+    while (WiFi.status() != WL_CONNECTED && --retry >= 0) {
+        M5_LOGI(".");
+        m5::utility::delay(1000);
+    }
+    if (WiFi.status() != WL_CONNECTED) {
+        M5_LOGE("Failed to connect WiFi");
+        return false;
+    }
+
+    std::shuffle(std::begin(ntpURLTable), std::end(ntpURLTable), rng);
+    configTzTime(posix_tz ? posix_tz : defaultPosixTZ, ntpURLTable[0], ntpURLTable[1], ntpURLTable[2]);
+
+    // Waiting for time synchronization
+    retry = 10;
+    sntp_sync_status_t st{};
+    while (((st = sntp_get_sync_status()) == SNTP_SYNC_STATUS_RESET) && --retry >= 0) {
+        M5_LOGI("Time synchronization in progress");
+        m5::utility::delay(1000);
+    }
+    WiFi.disconnect(true);
+    WiFi.mode(WIFI_OFF);
+
+    std::tm discard{};
+    if ((st != SNTP_SYNC_STATUS_COMPLETED) || !getLocalTime(&discard, 10 * 1000 /* timeout */)) {
+        M5_LOGE("Failed to sync time");
+        return false;
+    }
+
+    // Set RTC if exists
+    if (M5.Rtc.isEnabled()) {
+        time_t t = time(nullptr) + 1;
+        while (t > time(nullptr)) {
+            /* Nop */
+        }
+        M5.Rtc.setDateTime(std::gmtime(&t));
+    }
+    return true;
+}