Removal of ntp_client_plus files, refactoring to use time C lib instead.

include/ntp_client_plus.h

@@ -1,90 +0,0 @@
-#ifndef NTPCLIENTPLUS_H
-#define NTPCLIENTPLUS_H
-
-#include <Arduino.h>
-#include <WiFiUdp.h>
-
-#define UNIX_TIMESTAMP_1900 2208988800UL // careful: positive value
-#define NTP_PACKET_SIZE 48
-#define NTP_DEFAULT_LOCAL_PORT 1337
-#define MAX_NTP_CONN_TRIES 50       // 50 * NTP_RECEIVE_WAIT_TIME_MS => 500ms
-#define NTP_RECEIVE_WAIT_TIME_MS 10 // 10ms
-
-typedef enum
-{
-    NTP_UPDATE_TIMEOUT = -1,
-    NTP_UPDATE_SUCCESS = 0,
-    NTP_UPDATE_DIFFTOOHIGH = 1,
-    NTP_UPDATE_TIME_INVALID = 2
-} NtpReturnValue;
-
-/**
- * @brief Own NTP Client library for Arduino with code from:
- * - https://github.com/arduino-libraries/NTPClient
- * - SPS&Technik - Projekt WordClock v1.02
- *
- */
-class NTPClientPlus
-{
-public:
-    NTPClientPlus(UDP &udp, const char *pool_server_name, int utcx, bool sw_change);
-    bool is_leap_year(unsigned int year);
-    bool check_daylight_saving_time();
-    int get_hours_12() const;
-    int get_hours_24() const;
-    int get_minutes() const;
-    int get_month(int dayOfYear);
-    int get_seconds() const;
-    int update_ntp();
-    long get_time_offset();
-    String get_formatted_date();
-    String get_formatted_time() const;
-    unsigned int get_day_of_week();
-    unsigned int get_year();
-    unsigned long get_epoch_time() const;
-    unsigned long get_secs_since_1900() const;
-    void calc_date();
-    void end();
-    void set_pool_server_name(const char *pool_server_name);
-    void set_time_offset(int time_offset);
-    void setup_ntp_client();
-
-private:
-    UDP *_udp;
-    bool _udp_setup = false;
-
-    bool _sw_change = 1;
-    const char *_pool_server_name = "pool.ntp.org"; // Default time server
-    int _utcx = 0;
-    IPAddress _pool_server_ip;
-    long _time_offset = 0;
-    unsigned int _port = NTP_DEFAULT_LOCAL_PORT;
-
-    unsigned long _update_interval = 60000; // In ms
-
-    unsigned int _date_day = 0;
-    unsigned int _date_month = 0;
-    unsigned int _date_year = 0;
-    unsigned int _day_of_week = 0;
-    unsigned long _current_epoc = 0; // In s
-    unsigned long _last_secs_since_1900 = 0;
-    unsigned long _last_update = 0;     // In ms
-    unsigned long _secs_since_1900 = 0; // seconds since 1. Januar 1900, 00:00:00
-
-    unsigned char _packet_buffer[NTP_PACKET_SIZE] = {0};
-    void send_ntp_packet();
-    void set_summertime(bool summertime);
-
-    static const unsigned long milliseconds_per_second = 1000;
-    static const unsigned long minutes_per_hour = 60;
-    static const unsigned long seconds_per_day = 86400;
-    static const unsigned long seconds_per_hour = 3600;
-    static const unsigned long seconds_per_minute = 60;
-
-    // number of days in months
-    unsigned int _days_per_month[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
-};
-
-void wait(unsigned long time_ms);
-
-#endif /* NTPCLIENTPLUS_H */

include/wordclock_constants.h

@@ -6,8 +6,10 @@
 // ----------------------------------------------------------------------------------
 // CONSTANTS
 // ----------------------------------------------------------------------------------
-#define AP_SSID "WordclockAP"                            // SSID name of Access Point
-#define NTP_SERVER_URL "de.pool.ntp.org"                 // NTP server address
+#define AP_SSID "WordclockAP"                                // SSID name of Access Point
+#define NTP_SERVER_URL "de.pool.ntp.org"                     // NTP server address
+#define MY_TZ "CET-1CEST-2,M3.5.0/02:00:00,M10.5.0/03:00:00" // Timezone
+
 #define HOSTNAME (String("wordclock"))                   // Local hostname
 #define LOGGER_MULTICAST_IP (IPAddress(230, 120, 10, 2)) // IP for UDP server
 #define LOGGER_MULTICAST_PORT (8123)                     // Port for UDP server

include/wordclock_esp8266.h

@@ -66,6 +66,8 @@ void handle_current_state(void);
 void handle_data_request(void);
 void handle_led_direct(void);
 void limit_value_ranges(void);
+void log_time(tm local_time);
+void ntp_time_update(uint32 *last_ntp_update_us);
 void ntp_time_update(uint32 *last_ntp_update_us);
 void on_state_entry(uint8_t state);
 void read_settings_from_EEPROM(void);

platformio.ini

@@ -16,6 +16,7 @@ platform = espressif8266
 board = nodemcuv2
 framework = arduino
 lib_deps = 
+	adafruit/Adafruit BusIO@^1.15.0
 	adafruit/Adafruit NeoMatrix@^1.3.0
 	adafruit/Adafruit NeoPixel@^1.11.0
 	tzapu/WiFiManager@^0.16.0

src/connectivity/ntp_client_plus.cpp

@@ -1,658 +0,0 @@
-#include <Arduino.h>
-#include "ntp_client_plus.h"
-
-/**
- * @brief Construct a new NTPClientPlus::NTPClientPlus object
- *
- * @param udp   UDP client
- * @param pool_server_name    time server name
- * @param utcx  UTC offset (in 1h)
- * @param sw_change should summer/winter time be considered
- */
-NTPClientPlus::NTPClientPlus(UDP &udp, const char *pool_server_name, int utcx, bool sw_change)
-{
-    this->_udp = &udp;
-    this->_utcx = utcx;
-    this->_time_offset = this->seconds_per_hour * this->_utcx;
-    this->_pool_server_name = pool_server_name;
-    this->_sw_change = sw_change;
-}
-
-/**
- * @brief Starts the underlying UDP client, get first NTP timestamp and calc date
- *
- */
-void NTPClientPlus::setup_ntp_client()
-{
-    this->_udp->begin(this->_port);
-    this->_udp_setup = true;
-    this->update_ntp();
-    this->calc_date();
-}
-
-/**
- * @brief Get new update from NTP
- *
- * @return NTP_UPDATE_TIMEOUT         timeout after 500 ms
- * @return NTP_UPDATE_SUCCESS         after successful update
- * @return NTP_UPDATE_DIFFTOOHIGH     too much difference to previous received time (try again)
- * @return NTP_UPDATE_TIME_INVALID    time value is invalid
- */
-int NTPClientPlus::update_ntp()
-{
-    // flush any existing packets
-    while (this->_udp->parsePacket() != 0)
-    {
-        this->_udp->flush();
-    }
-
-    this->send_ntp_packet();
-
-    // Wait till data is there or timeout...
-    uint8_t conn_tries = 0;
-    int received_bytes = 0;
-
-    while ((received_bytes == 0) && (conn_tries++ <= MAX_NTP_CONN_TRIES))
-    {
-        received_bytes = this->_udp->parsePacket();
-        wait(NTP_RECEIVE_WAIT_TIME_MS);
-    }
-
-    if (conn_tries >= MAX_NTP_CONN_TRIES)
-    {
-        return NTP_UPDATE_TIMEOUT;
-    }
-
-    this->_udp->read(this->_packet_buffer, NTP_PACKET_SIZE);
-
-    unsigned long high_word = word(this->_packet_buffer[40], this->_packet_buffer[41]);
-    unsigned long low_word = word(this->_packet_buffer[42], this->_packet_buffer[43]);
-    // combine the four bytes (two words) into a long integer
-    // this is NTP time (seconds since Jan 1 1900):
-    unsigned long temp_secs_since_1900 = high_word << 16 | low_word;
-
-    if (temp_secs_since_1900 < UNIX_TIMESTAMP_1900) // NTP time is not valid
-    {
-        return NTP_UPDATE_TIME_INVALID;
-    }
-
-    // check if time off last ntp update is roughly in the same range: 100sec apart (validation check)
-    if (this->_last_secs_since_1900 == 0 || temp_secs_since_1900 - this->_last_secs_since_1900 < 100000)
-    {
-        // Only update time then account for delay in reading the time
-        this->_last_update = (system_get_time() / 1000) - (NTP_RECEIVE_WAIT_TIME_MS * (conn_tries + 1));
-        this->_secs_since_1900 = temp_secs_since_1900;
-        this->_current_epoc = this->_secs_since_1900 - UNIX_TIMESTAMP_1900;
-
-        // Remember time of last update
-        this->_last_secs_since_1900 = temp_secs_since_1900;
-        return NTP_UPDATE_SUCCESS; // return 0 after successful update
-    }
-    else
-    {
-        // Remember time of last update
-        this->_last_secs_since_1900 = temp_secs_since_1900;
-        return NTP_UPDATE_DIFFTOOHIGH;
-    }
-}
-
-/**
- * @brief Stops the underlying UDP client
- *
- */
-void NTPClientPlus::end()
-{
-    this->_udp->stop();
-    this->_udp_setup = false;
-}
-
-/**
- * @brief Setter TimeOffset
- *
- * @param time_offset offset from UTC in seconds
- */
-void NTPClientPlus::set_time_offset(int time_offset)
-{
-    this->_time_offset = time_offset;
-}
-
-long NTPClientPlus::get_time_offset()
-{
-    return this->_time_offset;
-}
-
-/**
- * @brief Set time server name
- *
- * @param pool_server_name
- */
-void NTPClientPlus::set_pool_server_name(const char *pool_server_name)
-{
-    this->_pool_server_name = pool_server_name;
-}
-
-/**
- * @brief Calc seconds since 1. Jan. 1900
- *
- * @return unsigned long seconds since 1. Jan. 1900
- */
-unsigned long NTPClientPlus::get_secs_since_1900() const
-{
-    return this->_time_offset +                                        // User offset
-           this->_secs_since_1900 +                                    // seconds returned by the NTP server
-           (((system_get_time() / 1000) - this->_last_update) / 1000); // Time since last update
-}
-
-/**
- * @brief Get UNIX Epoch time since 1. Jan. 1970
- *
- * @return unsigned long UNIX Epoch time since 1. Jan. 1970 in seconds
- */
-unsigned long NTPClientPlus::get_epoch_time() const
-{
-    return this->get_secs_since_1900() - UNIX_TIMESTAMP_1900;
-}
-
-/**
- * @brief Get current hours in 24h format
- *
- * @return int
- */
-int NTPClientPlus::get_hours_24() const
-{
-    int hours = ((this->get_epoch_time() % 86400L) / 3600);
-    return hours;
-}
-
-/**
- * @brief Get current hours in 12h format
- *
- * @return int
- */
-int NTPClientPlus::get_hours_12() const
-{
-    return this->get_hours_24() % 12;
-}
-
-/**
- * @brief Get current minutes
- *
- * @return int
- */
-int NTPClientPlus::get_minutes() const
-{
-    return ((this->get_epoch_time() % 3600) / 60);
-}
-
-/**
- * @brief Get current seconds
- *
- * @return int
- */
-int NTPClientPlus::get_seconds() const
-{
-    return this->get_epoch_time() % 60;
-}
-
-/**
- * @brief
- *
- * @return String time formatted like `hh:mm:ss`
- */
-String NTPClientPlus::get_formatted_time() const
-{
-    unsigned long raw_time = this->get_epoch_time();
-    unsigned long hours = (raw_time % 86400L) / 3600;
-    String hours_str = hours < 10 ? "0" + String(hours) : String(hours);
-
-    unsigned long minutes = (raw_time % 3600) / 60;
-    String minute_str = minutes < 10 ? "0" + String(minutes) : String(minutes);
-
-    unsigned long seconds = raw_time % 60;
-    String second_str = seconds < 10 ? "0" + String(seconds) : String(seconds);
-
-    return hours_str + ":" + minute_str + ":" + second_str;
-}
-
-/**
- * @brief
- *
- * @return String date formatted like `dd.mm.yyyy`
- */
-String NTPClientPlus::get_formatted_date()
-{
-    this->calc_date();
-    unsigned int dateDay = this->_date_day;
-    unsigned int dateMonth = this->_date_month;
-    unsigned int dateYear = this->_date_year;
-
-    String dayStr = dateDay < 10 ? "0" + String(dateDay) : String(dateDay);
-    String monthStr = dateMonth < 10 ? "0" + String(dateMonth) : String(dateMonth);
-    String yearStr = dateYear < 10 ? "0" + String(dateYear) : String(dateYear);
-
-    return dayStr + "." + monthStr + "." + yearStr;
-}
-
-/**
- * @brief Calc date from seconds since 1900
- *
- */
-void NTPClientPlus::calc_date()
-{
-    // get days since 1900
-    unsigned long days1900 = this->get_secs_since_1900() / seconds_per_day;
-
-    // calc current year
-    this->_date_year = this->get_year();
-
-    // calc how many leap days since 1.Jan 1900
-    int leap_days = 0;
-    for (unsigned int i = 1900; i < this->_date_year; i++)
-    {
-        // check if leap year
-        if (this->is_leap_year(i))
-        {
-            leap_days++;
-        }
-    }
-    leap_days = leap_days - 1;
-
-    // check if current year is leap year
-    if (this->is_leap_year(this->_date_year))
-    {
-        _days_per_month[2] = 29;
-    }
-    else
-    {
-        _days_per_month[2] = 28;
-    }
-
-    unsigned int day_of_year = (days1900 - ((this->_date_year - 1900) * 365) - leap_days);
-
-    // calc current month
-    this->_date_month = this->get_month(day_of_year);
-
-    this->_date_day = 0;
-
-    // calc day of month
-    for (unsigned int i = 0; i < this->_date_month; i++)
-    {
-        this->_date_day = this->_date_day + _days_per_month[i];
-    }
-    this->_date_day = day_of_year - this->_date_day;
-
-    // calc day of week:
-    // Monday = 1, Tuesday = 2, Wednesday = 3, Thursday = 4, Friday = 5, Saturday = 6, Sunday = 7
-    // 1. Januar 1900 was a monday
-    this->_day_of_week = 1;
-
-    for (unsigned int i = 0; i < days1900; i++)
-    {
-        if (this->_day_of_week < 7)
-        {
-            this->_day_of_week = this->_day_of_week + 1;
-        }
-        else
-        {
-            this->_day_of_week = 1;
-        }
-    }
-
-    // End: Calc date (dateDay, dateMonth, dateYear)
-
-    // calc if summer time active
-
-    this->check_daylight_saving_time();
-}
-
-/**
- * @brief Getter for day of the week
- *
- * @return unsigned int
- */
-unsigned int NTPClientPlus::get_day_of_week()
-{
-    return this->_day_of_week;
-}
-
-/**
- * @brief Function to calc current year
- *
- * @return unsigned int
- */
-unsigned int NTPClientPlus::get_year()
-{
-    unsigned long secs_since_1900 = this->get_secs_since_1900();
-
-    // NTP starts at 1. Jan 1900
-    unsigned int result = 1900;
-    unsigned int days_in_year = 0;
-    unsigned int days = 0;
-    unsigned int days_since_1900 = 0;
-
-    unsigned int for_i = 0;
-    bool leap_year = false;
-
-    days_since_1900 = secs_since_1900 / this->seconds_per_day;
-
-    for (for_i = 0; for_i < days_since_1900; for_i++)
-    {
-        leap_year = this->is_leap_year(result);
-
-        if (leap_year)
-        {
-            days_in_year = 366;
-        }
-        else
-        {
-            days_in_year = 365;
-        }
-        days++;
-
-        if (days >= days_in_year)
-        {
-            result++;
-            days = 0;
-        }
-    }
-
-    return result;
-}
-
-/**
- * @brief Function to check if given year is leap year
- *
- * @param year
- * @return true
- * @return false
- */
-bool NTPClientPlus::is_leap_year(unsigned int year)
-{
-
-    bool result = false;
-
-    // check for leap year
-    if ((year % 4) == 0)
-    {
-        result = true;
-
-        if ((year % 100) == 0)
-        {
-            result = false;
-
-            if ((year % 400) == 0)
-            {
-                result = true;
-            }
-        }
-    }
-    else
-    {
-        result = false;
-    }
-
-    return result;
-}
-
-/**
- * @brief Get Month of given day of year
- *
- * @param day_of_year
- * @return int
- */
-int NTPClientPlus::get_month(int day_of_year)
-{
-    bool leap_year = this->is_leap_year(this->get_year());
-
-    // Month beginnings
-    int month_min[13] = {0, 1, 32, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335};
-    // Month endings
-    int month_max[13] = {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365};
-    int month = 0;
-    int y = 0;
-
-    // Calculation of the beginning and end of each month in the leap year
-    if (leap_year == true)
-    {
-        for (y = 3; y < 13; y++)
-        {
-            ++month_min[y];
-        }
-
-        for (y = 2; y < 13; y++)
-        {
-            ++month_max[y];
-        }
-    }
-
-    // January
-    if (day_of_year >= month_min[1] && day_of_year <= month_max[1])
-    {
-        month = 1;
-    }
-
-    // February
-    if (day_of_year >= month_min[2] && day_of_year <= month_max[2])
-    {
-        month = 2;
-    }
-
-    // March
-    if (day_of_year >= month_min[3] && day_of_year <= month_max[3])
-    {
-        month = 3;
-    }
-
-    // April
-    if (day_of_year >= month_min[4] && day_of_year <= month_max[4])
-    {
-        month = 4;
-    }
-
-    // May
-    if (day_of_year >= month_min[5] && day_of_year <= month_max[5])
-    {
-        month = 5;
-    }
-
-    // June
-    if (day_of_year >= month_min[6] && day_of_year <= month_max[6])
-    {
-        month = 6;
-    }
-
-    // July
-    if (day_of_year >= month_min[7] && day_of_year <= month_max[7])
-    {
-        month = 7;
-    }
-
-    // August
-    if (day_of_year >= month_min[8] && day_of_year <= month_max[8])
-    {
-        month = 8;
-    }
-
-    // September
-    if (day_of_year >= month_min[9] && day_of_year <= month_max[9])
-    {
-        month = 9;
-    }
-
-    // October
-    if (day_of_year >= month_min[10] && day_of_year <= month_max[10])
-    {
-        month = 10;
-    }
-
-    // November
-    if (day_of_year >= month_min[11] && day_of_year <= month_max[11])
-    {
-        month = 11;
-    }
-
-    // December
-    if (day_of_year >= month_min[12] && day_of_year <= month_max[12])
-    {
-        month = 12;
-    }
-
-    return month;
-}
-
-/**
- * @brief (private) Send NTP Packet to NTP server
- *
- */
-void NTPClientPlus::send_ntp_packet()
-{
-    // set all bytes in the buffer to 0
-    memset(this->_packet_buffer, 0, NTP_PACKET_SIZE);
-    // Initialize values needed to form NTP request
-    this->_packet_buffer[0] = 0b11100011; // LI, Version, Mode
-    this->_packet_buffer[1] = 0;          // Stratum, or type of clock
-    this->_packet_buffer[2] = 6;          // Polling Interval
-    this->_packet_buffer[3] = 0xEC;       // Peer Clock Precision
-    // 8 bytes of zero for Root Delay & Root Dispersion
-    this->_packet_buffer[12] = 49;
-    this->_packet_buffer[13] = 0x4E;
-    this->_packet_buffer[14] = 49;
-    this->_packet_buffer[15] = 52;
-
-    // all NTP fields have been given values, now
-    // you can send a packet requesting a timestamp:
-    if (this->_pool_server_name)
-    {
-        this->_udp->beginPacket(this->_pool_server_name, 123);
-    }
-    else
-    {
-        this->_udp->beginPacket(this->_pool_server_ip, 123);
-    }
-    this->_udp->write(this->_packet_buffer, NTP_PACKET_SIZE);
-    this->_udp->endPacket();
-}
-
-/**
- * @brief (private) Set time offset accordance to summer time
- *
- * @param summertime
- */
-void NTPClientPlus::set_summertime(bool summertime)
-{
-    if (summertime)
-    {
-        this->_time_offset = this->seconds_per_hour * (this->_utcx + 1);
-    }
-    else
-    {
-        this->_time_offset = this->seconds_per_hour * (this->_utcx);
-    }
-}
-
-/**
- * @brief (private) Update Summer/Winter time change
- *
- * @returns bool summertime active
- */
-bool NTPClientPlus::check_daylight_saving_time()
-{
-    unsigned int day_of_week = this->_day_of_week;
-    unsigned int date_day = this->_date_day;
-    unsigned int date_month = this->_date_month;
-
-    bool summertime_active = false;
-
-    if (this->_sw_change)
-    {
-        // Start: Set summer-/ winter time
-        // current month is march
-        if (date_month == 3)
-        {
-
-            // it is last week in march
-            if ((this->_days_per_month[3] - date_day) < 7)
-            {
-                // Example year 2020: March 31 days; Restart March 26, 2020 (Thursday = weekday = 4); 5 days remaining; Last Sunday March 29, 2020
-                // Calculation: 31 - 26 = 5; 5 + 4 = 9;
-                // Result: Last day in March is a Tuesday. There folfalses another Sunday in October => set winter time
-
-                // Example year 2021: March 31 days; Restart March 30, 2021 (Tuesday = weekday = 2); 1 days remaining; Last Sunday March 28, 2021
-                // Calculation: 31 - 30 = 1; 1 + 2 = 3;
-                // Result: Last day in March is a Wednesday. Changeover to summer time already done => set summer time
-
-                // There folfalses within the last week in March one more Sunday => set winter time
-                if (((this->_days_per_month[3] - date_day) + day_of_week) >= 7)
-                {
-                    this->set_summertime(0);
-                    summertime_active = false;
-                }
-                else // last sunday in march already over -> summer time
-                {
-                    this->set_summertime(1);
-                    summertime_active = true;
-                }
-            }
-            else // restart in first three weeks of march -> winter time
-            {
-                this->set_summertime(0);
-                summertime_active = false;
-            }
-        }
-
-        // current month is october
-        else if (date_month == 10)
-        {
-            // restart last week of october
-            if ((this->_days_per_month[10] - date_day) < 7)
-            {
-
-                // Example year 2020: October 31 days; restart October 26, 2020 (Monday = weekday = 1); 5 days remaining; last Sunday October 25, 2020
-                // Calculation: 31 - 26 = 5; 5 + 1 = 6;
-                // Result: Last day in October is a Saturday. Changeover to winter time already done => set winter time
-
-                // Example year 2021: October 31 days; Restart 26. October 2021 (Tuesday = weekday = 2); 5 days remaining; Last Sunday 31. October 2021
-                // Calculation: 31 - 26 = 5; 5 + 2 = 7;
-                // Result: Last day in October is a Sunday. There folfalses another Sunday in October => set summer time
-
-                // There folfalses within the last week in October one more Sunday => summer time
-                if (((this->_days_per_month[10] - date_day) + day_of_week) >= 7)
-                {
-                    this->set_summertime(1);
-                    summertime_active = true;
-                }
-                else // last sunday in october already over -> winter time
-                {
-                    this->set_summertime(0);
-                    summertime_active = false;
-                }
-            }
-            else // restart in first three weeks of october -> summer time
-            {
-                this->set_summertime(1);
-                summertime_active = true;
-            }
-        }
-        else if (date_month > 3 && date_month < 10) // restart in summer time
-        {
-            this->set_summertime(1);
-            summertime_active = true;
-        }
-        else if (date_month < 3 || date_month > 10) // restart in winter time
-        {
-            this->set_summertime(0);
-            summertime_active = false;
-        }
-    }
-
-    return summertime_active;
-}
-
-void wait(unsigned long time_ms)
-{
-    unsigned long start = (system_get_time() / 1000); // in ms
-    while (((system_get_time() / 1000) - start) < time_ms)
-    {
-        yield();
-    };
-}

src/wordclock_esp8266.cpp

@@ -29,15 +29,14 @@
 #include <EEPROM.h>             //from ESP8266 Arduino Core (automatically installed when ESP8266 was installed via Boardmanager)
 #include <ESP8266WebServer.h>
 #include <ESP8266WiFi.h>
-#include <WiFiManager.h> //https://github.com/tzapu/WiFiManager WiFi Configuration Magic
-#include <WiFiUdp.h>
+#include <time.h>
+#include <WiFiManager.h> // https://github.com/tzapu/WiFiManager WiFi Configuration Magic
 
 // own libraries
 #include "animation_functions.h"
 #include "base64_wrapper.h" // copied from https://github.com/Xander-Electronics/Base64
 #include "led_matrix.h"
 #include "littlefs_wrapper.h"
-#include "ntp_client_plus.h"
 #include "ota_functions.h"
 #include "pong.h"
 #include "render_functions.h"
@@ -49,14 +48,15 @@
 // ----------------------------------------------------------------------------------
 //                               GLOBAL VARIABLES
 // ----------------------------------------------------------------------------------
+UDPLogger logger; // Logger
 Adafruit_NeoMatrix matrix = Adafruit_NeoMatrix(MATRIX_WIDTH, MATRIX_HEIGHT + 1, NEOPIXEL_PIN,
                                                NEO_MATRIX_TOP + NEO_MATRIX_LEFT + NEO_MATRIX_ROWS + NEO_MATRIX_ZIGZAG,
                                                NEO_GRB + NEO_KHZ800);   // NeoMatrix
-UDPLogger logger;                                                       // Logger
+char strftime_buf[64];                                                  // Time string buffer
 ESP8266WebServer webserver(HTTP_PORT);                                  // Webserver
 LEDMatrix led_matrix = LEDMatrix(&matrix, DEFAULT_BRIGHTNESS, &logger); // NeoMatrix wrapper
-WiFiUDP wifi_udp;
-NTPClientPlus ntp_client = NTPClientPlus(wifi_udp, NTP_SERVER_URL, 1, true);
+struct tm timeinfo;                                                     // Structure tm holds time information
+time_t now;                                                             // Seconds since Epoch (1970) - UTC
 
 // ----------------------------------------------------------------------------------
 //                               STATIC VARIABLES
@@ -70,6 +70,8 @@ static Pong pong = Pong(&led_matrix, &logger);
 static Snake snake = Snake(&led_matrix, &logger);
 static Tetris tetris = Tetris(&led_matrix, &logger);
 
+static uint32 last_ntp_update_us = 0; // time of last NTP update
+
 static bool flg_night_mode = false;       // state of nightmode
 static bool flg_reset_wifi_creds = false; // used to reset stored wifi credentials
 static bool spiral_direction = false;
@@ -87,7 +89,7 @@ static const uint32_t period_timings[NUM_STATES] = {PERIOD_CLOCK_UPDATE_US, PERI
                                                     PERIOD_ANIMATION_US, PERIOD_TETRIS_US, PERIOD_SNAKE_US,
                                                     PERIOD_PONG_US, PERIOD_ANIMATION_US};
 
-// Quarterly brightness factor for dynamic brightness
+// Quarterly brightness factor for dynamic brightness (4 quarters a 24 hours)
 static const float qtly_brightness_factor[96] = {
     0.0f, 0.0f, 0.0f, 0.001f, 0.003f, 0.007f, 0.014f, 0.026f, 0.044f, 0.069f, 0.101f, 0.143f, 0.194f, 0.253f, 0.32f,
     0.392f, 0.468f, 0.545f, 0.62f, 0.691f, 0.755f, 0.811f, 0.858f, 0.896f, 0.927f, 0.949f, 0.966f, 0.978f, 0.986f,
@@ -212,17 +214,13 @@ void setup()
     }
 
     // setup NTP
-    ntp_client.setup_ntp_client();
-    logger.log_string("NTP running");
-    logger.log_string("Time: " + ntp_client.get_formatted_time());
-    logger.log_string("TimeOffset (seconds): " + String(ntp_client.get_time_offset()));
+    configTime(MY_TZ, NTP_SERVER_URL);
+    ntp_time_update(&last_ntp_update_us); // NTP time update
 
     // show the current time for short time in words
-    int hours = ntp_client.get_hours_24();
-    int minutes = ntp_client.get_minutes();
-    String timeMessage = time_to_string(hours, minutes);
+    String timeMessage = time_to_string(timeinfo.tm_hour, timeinfo.tm_min);
     show_string_on_clock(timeMessage, main_color_clock);
-    draw_minute_indicator(minutes, main_color_clock);
+    draw_minute_indicator(timeinfo.tm_min, main_color_clock);
     led_matrix.draw_on_matrix_smooth(filter_factor);
 
     // init all animation modes
@@ -233,7 +231,7 @@ void setup()
     // init random tetris
     random_tetris(true);
 
-    // Range limits
+    // Set range limits
     limit_value_ranges();
 
     logger.log_string("Nightmode starts at: " + String(night_mode_times_ps->start_hour) + ":" + String(night_mode_times_ps->start_min));
@@ -256,7 +254,6 @@ void loop()
     static uint32 last_matrix_update_us = 0;   // time of last Matrix update
     static uint32 last_heartbeat_us = 0;       // time of last heartbeat sending
     static uint32 last_nightmode_check_us = 0; // time of last nightmode check
-    static uint32 last_ntp_update_us = 0;      // time of last NTP update
 
     handleOTA(); // handle OTA
 
@@ -313,69 +310,95 @@ void loop()
 //                                  OTHER FUNCTIONS
 // ----------------------------------------------------------------------------------
 
+/**
+ * @brief Updates the NTP time
+ *
+ * @return boolean - true if NTP update was successful, false otherwise
+ */
+bool get_ntp_time(uint32 sec)
+{
+    uint32 start = system_get_time() / 1000; // ms
+    do
+    {
+        time(&now);
+        localtime_r(&now, &timeinfo);
+        delay(10);
+    } while (((system_get_time() / 1000 - start) <= (1000 * sec)) && (timeinfo.tm_year < (2023 - 1900)));
+
+    if (timeinfo.tm_year <= (2023 - 1900))
+    {
+        return false; // the NTP call was not successful
+    }
+    else
+    {
+        return true;
+    }
+}
+
+void log_time(tm local_time)
+{
+    strftime(strftime_buf, sizeof(strftime_buf), "%c", &timeinfo);
+    logger.log_string(String(strftime_buf));
+}
+
 void handle_current_state()
 {
     switch (current_state)
     {
-    case ST_CLOCK: // state clock
-    {
-        int hours = ntp_client.get_hours_24();
-        int minutes = ntp_client.get_minutes();
-
-        (void)show_string_on_clock(time_to_string((uint8_t)hours, (uint8_t)minutes), main_color_clock);
-        draw_minute_indicator((uint8_t)minutes, main_color_clock);
-        break;
-    }
-    case ST_DICLOCK: // state diclock
-    {
-        int hours = ntp_client.get_hours_24();
-        int minutes = ntp_client.get_minutes();
-        show_digital_clock((uint8_t)hours, (uint8_t)minutes, main_color_clock);
-        break;
-    }
-    case ST_SPIRAL: // state spiral
-    {
-        int res = draw_spiral(false, spiral_direction, MATRIX_WIDTH - 2);
-        if ((bool)res && spiral_direction == 0)
+        case ST_CLOCK: // state clock
         {
-            // change spiral direction to closing (draw empty leds)
-            spiral_direction = true;
-            // init spiral with new spiral direction
-            draw_spiral(true, spiral_direction, MATRIX_WIDTH - 1);
+            (void)show_string_on_clock(time_to_string((uint8_t)timeinfo.tm_hour, (uint8_t)timeinfo.tm_min), main_color_clock);
+            draw_minute_indicator((uint8_t)timeinfo.tm_min, main_color_clock);
+            break;
         }
-        else if (res && spiral_direction == 1)
+        case ST_DICLOCK: // state diclock
         {
-            // reset spiral direction to normal drawing leds
-            spiral_direction = false;
-            // init spiral with new spiral direction
-            draw_spiral(true, spiral_direction, MATRIX_WIDTH - 1);
+            show_digital_clock((uint8_t)timeinfo.tm_hour, (uint8_t)timeinfo.tm_min, main_color_clock);
+            break;
+        }
+        case ST_SPIRAL: // state spiral
+        {
+            int res = draw_spiral(false, spiral_direction, MATRIX_WIDTH - 2);
+            if ((bool)res && spiral_direction == 0)
+            {
+                // change spiral direction to closing (draw empty leds)
+                spiral_direction = true;
+                // init spiral with new spiral direction
+                draw_spiral(true, spiral_direction, MATRIX_WIDTH - 1);
+            }
+            else if (res && spiral_direction == 1)
+            {
+                // reset spiral direction to normal drawing leds
+                spiral_direction = false;
+                // init spiral with new spiral direction
+                draw_spiral(true, spiral_direction, MATRIX_WIDTH - 1);
+            }
+            break;
+        }
+        case ST_TETRIS: // state tetris
+        {
+            tetris.loopCycle();
+            break;
+        }
+        case ST_SNAKE: // state snake
+        {
+            snake.loopCycle();
+            break;
+        }
+        case ST_PINGPONG: // state ping pong
+        {
+            pong.loopCycle();
+            break;
+        }
+        case ST_HEARTS:
+        {
+            draw_heart_animation();
+            break;
+        }
+        default:
+        {
+            break;
         }
-        break;
-    }
-    case ST_TETRIS: // state tetris
-    {
-        tetris.loopCycle();
-        break;
-    }
-    case ST_SNAKE: // state snake
-    {
-        snake.loopCycle();
-        break;
-    }
-    case ST_PINGPONG: // state ping pong
-    {
-        pong.loopCycle();
-        break;
-    }
-    case ST_HEARTS:
-    {
-        draw_heart_animation();
-        break;
-    }
-    default:
-    {
-        break;
-    }
     }
 }
 
@@ -424,8 +447,8 @@ void check_wifi_status()
 void check_night_mode()
 {
     // check if nightmode need to be activated
-    int hours = ntp_client.get_hours_24();
-    int minutes = ntp_client.get_minutes();
+    int hours = timeinfo.tm_hour;
+    int minutes = timeinfo.tm_min;
 
     if ((hours == night_mode_times_ps->start_hour) && (minutes == night_mode_times_ps->start_min))
     {
@@ -445,44 +468,19 @@ void check_night_mode()
 void ntp_time_update(uint32 *last_ntp_update_us)
 {
     // NTP time update
-    int ntp_retval = ntp_client.update_ntp();
+    bool ntp_retval = get_ntp_time(*last_ntp_update_us / 10000000);
 
-    switch (ntp_retval)
+    if (ntp_retval == true)
     {
-    case NTP_UPDATE_SUCCESS:
-    {
-        ntp_client.calc_date();
-        logger.log_string("NTP-Update successful, Time: " + ntp_client.get_formatted_time());
+        log_time(timeinfo);
         *last_ntp_update_us = system_get_time();
         watchdog_counter = 30;
-        break;
     }
-    case NTP_UPDATE_TIMEOUT:
+    else
     {
-        logger.log_string("NTP-Update not successful. Reason: Timeout");
+        logger.log_string("NTP-Update was not successful.");
         *last_ntp_update_us += 10000000;
         watchdog_counter--;
-        break;
-    }
-    case NTP_UPDATE_DIFFTOOHIGH:
-    {
-        logger.log_string("NTP-Update not successful. Reason: Too large time difference");
-        logger.log_string("Time: " + ntp_client.get_formatted_time());
-        logger.log_string("Date: " + ntp_client.get_formatted_date());
-        logger.log_string("TimeOffset (seconds): " + String(ntp_client.get_time_offset()));
-        logger.log_string("Summertime: " + String(ntp_client.check_daylight_saving_time()));
-        *last_ntp_update_us += 10000000;
-        watchdog_counter--;
-        break;
-    }
-    case NTP_UPDATE_TIME_INVALID:
-    default:
-    {
-        logger.log_string("NTP-Update not successful. Reason: NTP time not valid (<1970)");
-        *last_ntp_update_us += 10000000;
-        watchdog_counter--;
-        break;
-    }
     }
 
     logger.log_string("Watchdog counter: " + String(watchdog_counter));
@@ -504,34 +502,34 @@ void on_state_entry(uint8_t state)
     filter_factor = 0.5f;
     switch (state)
     {
-    case ST_SPIRAL:
-    {
-        spiral_direction = 0; // Init spiral with normal drawing mode
-        draw_spiral(true, spiral_direction, MATRIX_WIDTH - 1);
-        break;
-    }
-    case ST_TETRIS:
-    {
-        filter_factor = 1.0f; // no smoothing
-        tetris.ctrlStart();
-        break;
-    }
-    case ST_SNAKE:
-    {
-        filter_factor = 1.0f; // no smoothing
-        snake.initGame();
-        break;
-    }
-    case ST_PINGPONG:
-    {
-        filter_factor = 1.0f; // no smoothing
-        pong.initGame(1);
-        break;
-    }
-    default:
-    {
-        break;
-    }
+        case ST_SPIRAL:
+        {
+            spiral_direction = 0; // Init spiral with normal drawing mode
+            draw_spiral(true, spiral_direction, MATRIX_WIDTH - 1);
+            break;
+        }
+        case ST_TETRIS:
+        {
+            filter_factor = 1.0f; // no smoothing
+            tetris.ctrlStart();
+            break;
+        }
+        case ST_SNAKE:
+        {
+            filter_factor = 1.0f; // no smoothing
+            snake.initGame();
+            break;
+        }
+        case ST_PINGPONG:
+        {
+            filter_factor = 1.0f; // no smoothing
+            pong.initGame(1);
+            break;
+        }
+        default:
+        {
+            break;
+        }
     }
 }
 
@@ -1032,9 +1030,9 @@ uint8_t update_brightness()
     {
         new_brightness = calculate_dynamic_brightness(brightness_ps->dyn_brightness_min,
                                                       brightness_ps->dyn_brightness_max,
-                                                      ntp_client.get_hours_24(),
-                                                      ntp_client.get_minutes(),
-                                                      ntp_client.check_daylight_saving_time());
+                                                      timeinfo.tm_hour,
+                                                      timeinfo.tm_min,
+                                                      timeinfo.tm_isdst);
     }
     else // use static brightness
     {