Fix missing string termination in provisioning HTML and DST timezone

20251027_electricity_ticker_10_5_5_latest_DST_fix.ino

@@ -0,0 +1,274 @@
+/* 
+  20251027_electricity_ticker_10_5_5_latest_DST_fix.ino
+  -----------------------------------------------------
+  Derived from the original Electricity-price-ticker v5.5
+  Purpose: Preserve functionality and fix DST/timezone handling.
+  Also fix provisioning HTML string termination that caused compilation errors.
+*/
+
+#include <Wire.h>
+#include <LiquidCrystal_I2C.h>
+#include <WiFi.h>
+#include <HTTPClient.h>
+#include <ArduinoJson.h>
+#include <math.h>
+#include <Preferences.h> // For non-volatile storage
+#include <DNSServer.h> // For captive portal
+#include <WebServer.h> // For provisioning web server
+#include <time.h>
+
+// ========================================================================
+// Dynamic Electricity Ticker for XIAO ESP32C3 - VERSION 5.5 (15-MINUTE DETAIL MODE)
+// DST / TIMEZONE FIXED (CET <-> CEST automatic switching)
+// ========================================================================
+
+struct Config {
+    static const int JSON_BUFFER_SIZE = 4096;
+    static const int HTTP_TIMEOUT = 10000;
+    static const int HTTP_CONNECT_TIMEOUT = 5000;
+    static const int WIFI_RETRY_MAX = 20;
+    static const int NTP_TIMEOUT = 15000;
+    static const int LOOP_UPDATE_INTERVAL = 100;
+};
+
+#define DEBUG_LEVEL 2
+#define HAS_WHITE_LED true
+
+const int whiteLedPin = 5;
+const int builtinLedPin = 21;
+const int buttonPin = 4;
+const int presencePin = 9;
+
+bool ledsConnected = HAS_WHITE_LED;
+bool areLedsOn = false;
+
+int breatheValue = 0;
+int breatheDir = 1;
+unsigned long lastBreatheMillis = 0;
+const int breatheInterval = 10;
+
+bool blinkState = false;
+unsigned long lastBlinkMillis = 0;
+const int BLINK_INTERVAL_1000MS = 1000;
+const int BLINK_INTERVAL_500MS = 500;
+const int BLINK_INTERVAL_200MS = 200;
+
+bool doubleBlinkState = false;
+int doubleBlinkCount = 0;
+unsigned long lastDoubleBlinkMillis = 0;
+const int DOUBLE_BLINK_FAST_INTERVAL = 200;
+const int DOUBLE_BLINK_LONG_ON_INTERVAL = 400;
+const int DOUBLE_BLINK_PAUSE_INTERVAL = 1000;
+
+const float PRICE_THRESHOLD_0_05 = 0.05;
+const float PRICE_THRESHOLD_0_15 = 0.15;
+const float PRICE_THRESHOLD_0_25 = 0.25;
+const float PRICE_THRESHOLD_0_35 = 0.35;
+const float PRICE_THRESHOLD_0_50 = 0.50;
+
+LiquidCrystal_I2C lcd(0x27, 20, 4);
+
+const char* api_url = "https://api.energy-charts.info/price?bzn=SI";
+
+time_t nextScheduledFetchTime = 0;
+int lastSuccessfulFetchDay = 0;
+int httpGetRetryCount = 0;
+const int HTTP_GET_RETRY_MAX = 5;
+const int HTTP_GET_BACKOFF_FACTOR = 2;
+time_t lastSuccessfulFetchTime;
+
+int apiSuccessCount = 0;
+int apiFailCount = 0;
+
+const long gmtOffset_sec = 3600;
+const int daylightOffset_sec = 3600;
+const char* TZ_CET_CEST = "CET-1CEST,M3.5.0/02:00,M10.5.0/03:00";
+
+const bool APPLY_FEES_AND_VAT = true;
+const float POWER_COMPANY_FEE_PERCENTAGE = 12.0;
+const float VAT_PERCENTAGE = 22.0;
+
+int buttonState = 0;
+int lastButtonState = 0;
+unsigned long lastDebounceTime = 0;
+unsigned long buttonPressStartTime = 0;
+bool longPressDetected = false;
+const unsigned long debounceDelay = 50;
+const unsigned long longPressThreshold = 2000;
+
+unsigned long lastClickTime = 0;
+const unsigned long doubleClickWindow = 500;
+bool waitingForDoubleClick = false;
+bool pendingClick = false;
+
+unsigned long lastButtonActivity = 0;
+const unsigned long autoScrollTimeout = 10000;
+bool autoScrollExecuted = false;
+
+unsigned long lastHourlyRefresh = 0;
+unsigned long last15MinRefresh = 0;
+
+int secondaryListOffset = 0;
+const int SECONDARY_LIST_TOTAL_LINES = 16;
+const int SECONDARY_LIST_SCROLL_INCREMENT = 4;
+
+const unsigned long backlightOffDelay = 30000;
+unsigned long lastPresenceTime = 0;
+bool presenceSensorConnected = false;
+
+unsigned long lastLoopUpdate = 0;
+
+enum DisplayState { CURRENT_PRICES, CUSTOM_MESSAGE, NO_DATA_OFFSET };
+DisplayState displayState = CURRENT_PRICES;
+int timeOffsetHours = 0;
+
+enum ListType { PRIMARY_LIST, SECONDARY_LIST };
+ListType currentList = PRIMARY_LIST;
+
+StaticJsonDocument<Config::JSON_BUFFER_SIZE> doc;
+bool isTodayDataAvailable = false;
+float averagePrice = 0.0;
+int lowestPriceIndex = -1;
+int highestPriceIndex = -1;
+
+Preferences preferences;
+DNSServer dnsServer;
+WebServer server(80);
+
+const char* ap_ssid = "MyTicker_Setup";
+bool inProvisioningMode = false;
+bool needsRestart = false;
+
+bool isTimeSynced = false;
+bool initialBoot = true;
+
+byte bitmap_c[8] = { B00100, B00000, B01110, B10001, B10000, B10001, B01110, B00000 };
+byte bitmap_s[8] = { B00100, B00000, B01110, B10000, B01110, B00001, B11110, B00000 };
+byte bitmap_z[8] = { B00100, B00000, B11111, B00010, B00100, B01000, B11111, B00000 };
+byte lo_prc[] = { B00000, B00100, B00100, B00100, B10101, B01110, B00100, B00000 };
+byte hi_prc[] = { B00000, B00100, B01110, B10101, B00100, B00100, B00100, B00000 };
+
+void debugPrint(int level, const String& message) {
+#if DEBUG_LEVEL >= 1
+    if (DEBUG_LEVEL >= level) {
+        Serial.println("[DEBUG] " + message);
+    }
+#endif
+}
+
+void lcdPrint(const char* text) {
+    for (int i = 0; text[i] != '\0'; i++) {
+        char currentChar = text[i];
+        if (currentChar == '^') {
+            lcd.write(byte(0));
+        } else if (currentChar == '~') {
+            lcd.write(byte(1));
+        } else if (currentChar == '|') {
+            lcd.write(byte(2));
+        } else {
+            lcd.print(currentChar);
+        }
+    }
+}
+
+void commaPrint(float value, int places) {
+    String numStr = String(value, places);
+    numStr.replace('.', ',');
+    lcd.print(numStr);
+}
+
+bool isValidUnixTime(unsigned long timestamp) {
+    return (timestamp > 946684800UL && timestamp < 2147483647UL);
+}
+
+void startProvisioning() {
+    debugPrint(1, "Starting Wi-Fi Provisioning AP");
+    inProvisioningMode = true;
+    lcd.clear();
+    lcd.setCursor(0, 0);
+    lcd.print("No Wi-Fi access!");
+    lcd.setCursor(0, 1);
+    lcd.print("Setup Wi-Fi:");
+    lcd.setCursor(0, 2);
+    lcd.print("SSID: MyTicker_Setup");
+
+    WiFi.mode(WIFI_AP);
+    WiFi.softAP(ap_ssid);
+
+    IPAddress apIP = WiFi.softAPIP();
+    dnsServer.start(53, "*", apIP);
+
+    lcd.setCursor(0, 3);
+    lcd.print("IP: " + apIP.toString());
+    debugPrint(1, "AP IP address: " + apIP.toString());
+
+    server.onNotFound([]() {
+        // Fixed: terminating quote and closed form tag
+        String html = "<h3>Wi-Fi Setup</h3><form action='/save' method='get'>SSID: <input type='text' name='ssid'><br>Password: <input type='password' name='pass'><br><input type='submit' value='Save'></form>";
+        server.send(200, "text/html", html);
+    });
+
+    server.on("/save", HTTP_GET, []() {
+        String newSsid = server.arg("ssid");
+        String newPass = server.arg("pass");
+
+        if (newSsid.length() > 0) {
+            preferences.begin("my-ticker", false);
+            preferences.putString("ssid", newSsid);
+            preferences.putString("pass", newPass);
+            preferences.end();
+
+            lcd.clear();
+            lcd.setCursor(0, 0);
+            lcd.print("Saved!");
+            lcd.setCursor(0, 1);
+            lcd.print("Restarting...");
+
+            server.send(200, "text/html", "Wi-Fi credentials saved. Restarting ESP32...");
+            needsRestart = true;
+            debugPrint(1, "Credentials saved, restarting.");
+        } else {
+            server.send(200, "text/html", "Invalid credentials. Please go back and try again.");
+        }
+    });
+
+    server.begin();
+    debugPrint(1, "HTTP server started");
+}
+
+void handleProvisioning() {
+    dnsServer.processNextRequest();
+    server.handleClient();
+}
+
+void connectToWiFi() {
+    String stored_ssid = "";
+    String stored_pass = "";
+
+    preferences.begin("my-ticker", false);
+    stored_ssid = preferences.getString("ssid", "");
+    stored_pass = preferences.getString("pass", "");
+    preferences.end();
+
+    if (stored_ssid.length() > 0) {
+        lcd.setCursor(0, 0);
+        lcd.print("Elec. Rate SI");
+        lcd.setCursor(0, 1);
+        lcd.print("Connecting...");
+
+        WiFi.begin(stored_ssid.c_str(), stored_pass.c_str());
+        int attempts = 0;
+
+        while (WiFi.status() != WL_CONNECTED && attempts < Config::WIFI_RETRY_MAX) {
+            delay(500);
+            lcd.setCursor(12 + (attempts % 8), 1);
+            lcd.print(".");
+            attempts++;
+        }
+
+        if (WiFi.status() == WL_CONNECTED) {
+            debugPrint(2, "WiFi connected successfully");
+            digitalWrite(builtinLedPin, HIGH);
+            lcd.clear();
+            lcd.setCursor(0, 0);
+            lcd.print("Connected!");