automatically set timezone via API request

README.md

@@ -69,8 +69,11 @@ Please download all these libraries as ZIP from GitHub, and extract them in the
 - https://github.com/adafruit/Adafruit_NeoPixel
 - https://github.com/tzapu/WiFiManager
 - https://github.com/adafruit/Adafruit_BusIO
+- https://github.com/bxparks/AceTime
 
-folder structure should look like this:
+You can als install these libraries via the library manager in the Arduino IDE.
+
+The folder structure should look like this:
 
 ```
 MySketchbookLocation 

ntp_client_plus.cpp

@@ -12,7 +12,6 @@ NTPClientPlus::NTPClientPlus(UDP &udp, const char *poolServerName, int utcx, boo
 {
     this->_udp = &udp;
     this->_utcx = utcx;
-    this->_timeOffset = this->secondperhour * this->_utcx;
     this->_poolServerName = poolServerName;
     this->_swChange = _swChange;
 }
@@ -104,18 +103,13 @@ void NTPClientPlus::end()
 }
 
 /**
- * @brief Setter TimeOffset
+ * @brief Setter UTC offset
  * 
- * @param timeOffset offset from UTC in seconds
+ * @param utcOffset offset from UTC in minutes
  */
-void NTPClientPlus::setTimeOffset(int timeOffset)
+void NTPClientPlus::setUTCOffset(int utcOffset)
 {
-    this->_timeOffset = timeOffset;
-}
-
-long NTPClientPlus::getTimeOffset()
-{
-    return this->_timeOffset;
+    this->_utcx = utcOffset;
 }
 
 /**
@@ -135,9 +129,10 @@ void NTPClientPlus::setPoolServerName(const char *poolServerName)
  */
 unsigned long NTPClientPlus::getSecsSince1900() const
 {
-    return this->_timeOffset +                      // User offset
-           this->_secsSince1900 +                   // seconds returned by the NTP server
-           ((millis() - this->_lastUpdate) / 1000); // Time since last update
+    return this->_utcx * this->secondperminute +            // UTC offset
+            this->_summertime * this->secondperhour +       // Summer time offset
+            this->_secsSince1900 +                          // seconds returned by the NTP server
+            ((millis() - this->_lastUpdate) / 1000);        // Time since last update
 }
 
 /**
@@ -556,18 +551,11 @@ void NTPClientPlus::sendNTPPacket()
  */
 void NTPClientPlus::setSummertime(bool summertime)
 {
-    if (summertime)
-    {
-        this->_timeOffset = this->secondperhour * (this->_utcx + 1);
-    }
-    else
-    {
-        this->_timeOffset = this->secondperhour * (this->_utcx);
-    }
+    this->_summertime = summertime;
 }
 
 /**
- * @brief (private) Update Summer/Winter time change
+ * @brief Update Summer/Winter time change
  * 
  * @returns bool summertime active
  */

ntp_client_plus.h

@@ -21,7 +21,7 @@ class NTPClientPlus{
         void setupNTPClient();
         int updateNTP();
         void end();
-        void setTimeOffset(int timeOffset);
+        void setUTCOffset(int utcOffset);
         void setPoolServerName(const char* poolServerName);
         unsigned long getSecsSince1900() const;
         unsigned long getEpochTime() const;
@@ -36,7 +36,6 @@ class NTPClientPlus{
         unsigned int getYear();
         bool isLeapYear(unsigned int year);
         int getMonth(int dayOfYear);
-        long getTimeOffset();
         bool updateSWChange();
 
 
@@ -47,9 +46,9 @@ class NTPClientPlus{
         const char*   _poolServerName = "pool.ntp.org"; // Default time server
         IPAddress     _poolServerIP;
         unsigned int  _port           = NTP_DEFAULT_LOCAL_PORT;
-        long          _timeOffset     = 0;
         int           _utcx           = 0;
-        bool          _swChange        = 1;
+        bool          _swChange       = 1;
+        bool          _summertime     = false;
 
         unsigned long _updateInterval = 60000;  // In ms
 

timezonefunctions.ino

@@ -0,0 +1,74 @@
+#include <ESP8266HTTPClient.h>
+#include <AceTime.h>            // https://github.com/bxparks/AceTime
+#include "ntp_client_plus.h"
+#include "udplogger.h"
+
+using namespace ace_time;
+
+static const int CACHE_SIZE = 1;
+static ExtendedZoneProcessorCache<CACHE_SIZE> zoneProcessorCache;
+static ExtendedZoneManager manager(
+    zonedbx::kZoneAndLinkRegistrySize,
+    zonedbx::kZoneAndLinkRegistry,
+    zoneProcessorCache);
+
+/**
+ * @brief Request the timezone as string from the IP-API
+ * 
+ * @param logger UDPLogger object to log messages
+ * @return String timezone string
+ */
+String getTimeZoneString(UDPLogger &logger) {
+  WiFiClient client;
+  HTTPClient http;
+  logger.logString("[HTTP] Requesting timezone from IP-API");
+  if (http.begin(client, "http://ip-api.com/json/")) { 
+    int httpCode = http.GET();
+
+    if (httpCode > 0) { 
+      if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY) {
+        String payload = http.getString();
+
+        int tzIndex = payload.indexOf("\"timezone\":\"");
+        if (tzIndex != -1) {
+          int tzStart = tzIndex + 12; 
+          int tzEnd = payload.indexOf("\"", tzStart);
+          String timezone = payload.substring(tzStart, tzEnd);
+          logger.logString("[HTTP] Received timezone: " + timezone);
+          return timezone;
+        }
+      }
+    } 
+    else {
+      Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
+    }
+    http.end(); // Close connection
+  }
+  else {
+    logger.logString("[HTTP] Unable to connect");
+  }
+  return "";
+}
+
+/**
+ * @brief Update the UTC offset from the timezone string obtained from the IP-API
+ * 
+ * @param logger UDPLogger object to log messages
+ * @param ntp NTPClientPlus object to set the UTC offset
+ * @return int 
+ */
+void updateUTCOffsetFromTimezoneAPI(UDPLogger &logger, NTPClientPlus &ntp) {
+  String timezone = getTimeZoneString(logger);
+  if (timezone.length() > 0) {
+    uint16_t zone_index = manager.indexForZoneName(timezone.c_str());
+    if (zone_index != ZoneManager::kInvalidIndex) {
+      ExtendedZone zone = manager.getZoneForIndex(zone_index);
+      int offset = zone.stdOffset().toMinutes();
+      logger.logString("[ZoneManager] Timezone offset (min): " + String(offset));
+      ntp.setUTCOffset(offset);
+    }
+    else {
+      logger.logString("[ZoneManager] Error: Could not find time_zone value in DB. Use hardcoded UTC offset.");
+    }       
+  }
+}

wordclock_esp8266.ino

@@ -125,6 +125,8 @@ const String hostname = "wordclock";
 // URL DNS server
 const char WebserverURL[] = "www.wordclock.local";
 
+int utcOffset = 60; // UTC offset in minutes
+
 // ----------------------------------------------------------------------------------
 //                                        GLOBAL VARIABLES
 // ----------------------------------------------------------------------------------
@@ -174,7 +176,7 @@ uint16_t behaviorUpdatePeriod = PERIOD_TIMEVISUUPDATE; // holdes the period in w
 // Create necessary global objects
 UDPLogger logger;
 WiFiUDP NTPUDP;
-NTPClientPlus ntp = NTPClientPlus(NTPUDP, "pool.ntp.org", 1, true);
+NTPClientPlus ntp = NTPClientPlus(NTPUDP, "pool.ntp.org", utcOffset, true);
 LEDMatrix ledmatrix = LEDMatrix(&matrix, brightness, &logger);
 Tetris mytetris = Tetris(&ledmatrix, &logger);
 Snake mysnake = Snake(&ledmatrix, &logger);
@@ -343,10 +345,10 @@ void setup() {
   logger.logString("Reset Reason: " + ESP.getResetReason());
 
   // setup NTP
+  updateUTCOffsetFromTimezoneAPI(logger, ntp);
   ntp.setupNTPClient();
   logger.logString("NTP running");
   logger.logString("Time: " +  ntp.getFormattedTime());
-  logger.logString("TimeOffset (seconds): " + String(ntp.getTimeOffset()));
 
   // load persistent variables from EEPROM
   loadMainColorFromEEPROM();
@@ -457,7 +459,6 @@ void loop() {
       logger.logString("Time: " +  ntp.getFormattedTime());
       logger.logString("Date: " +  ntp.getFormattedDate());
       logger.logString("Day of Week (Mon=1, Sun=7): " +  String(ntp.getDayOfWeek()));
-      logger.logString("TimeOffset (seconds): " + String(ntp.getTimeOffset()));
       logger.logString("Summertime: " + String(ntp.updateSWChange()));
       lastNTPUpdate = millis();
       watchdogCounter = 30;
@@ -480,7 +481,6 @@ void loop() {
       logger.logString("Time: " +  ntp.getFormattedTime());
       logger.logString("Date: " +  ntp.getFormattedDate());
       logger.logString("Day of Week (Mon=1, Sun=7): " +  ntp.getDayOfWeek());
-      logger.logString("TimeOffset (seconds): " + String(ntp.getTimeOffset()));
       logger.logString("Summertime: " + String(ntp.updateSWChange()));
       lastNTPUpdate += 10000;
       watchdogCounter--;