Vrirtual AlertX tester - Wokwi ESP32, STM32, Arduino Simulator

#include <WiFi.h>
#include <WebServer.h>
#include <HTTPClient.h>

// --- WIFI CREDENTIALS (Wokwi Virtual WiFi) ---
const char* WIFI_SSID = "Wokwi-GUEST";
const char* WIFI_PASS = "";

// --- FIREBASE DETAILS ---
const String FB_URL = "https://esp32-monitor-b9dee-default-rtdb.firebaseio.com/";

WebServer server(80);
unsigned long lastUpdate = 0;
String DEVICE_MAC = ""; 
String currentAlarmStatus = "false";

void setup() {
  Serial.begin(115200);
  
  WiFi.begin(WIFI_SSID, WIFI_PASS);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  
  DEVICE_MAC = WiFi.macAddress();
  DEVICE_MAC.replace(":", ""); 
  
  Serial.println("\nWiFi Connected!");
  Serial.print("Local IP Address: ");
  Serial.println(WiFi.localIP());
  Serial.println("Device ID (MAC): " + DEVICE_MAC);

  server.on("/", handleRoot);
  server.on("/update", handleUpdate);
  server.begin();

  // Read existing alarm state from Firebase before writing
  readFromFirebase();

  // Now sync with correct alarm state
  syncToFirebase();
}

void loop() {
  server.handleClient();

  if (millis() - lastUpdate > 30000) {
    lastUpdate = millis();
    syncToFirebase();
  }
}

// ✅ Read current alarm state from Firebase on boot
void readFromFirebase() {
  if (WiFi.status() != WL_CONNECTED) return;

  HTTPClient http;
  String path = FB_URL + "Devices/" + DEVICE_MAC + "/status.json";
  http.begin(path);
  int response = http.GET();

  if (response == 200) {
    String body = http.getString();
    body.replace("\"", ""); // remove JSON quotes
    Serial.println("Firebase Read: " + body);

    // Parse alarm field (index 4 in CSV)
    int commaCount = 0;
    String alarmVal = "";
    for (char c : body) {
      if (c == ',') commaCount++;
      else if (commaCount == 4) alarmVal += c;
      else if (commaCount > 4) break;
    }
    alarmVal.trim();

    if (alarmVal == "true" || alarmVal == "false") {
      currentAlarmStatus = alarmVal;
      Serial.println("Restored alarm state: " + currentAlarmStatus);
    }
  } else {
    Serial.println("No existing data, starting fresh.");
  }

  http.end();
}

void handleRoot() {
  String html = "<html><head><meta name='viewport' content='width=device-width, initial-scale=1'>";
  html += "<style>body{background:#000b1a; color:white; font-family:sans-serif; text-align:center;} ";
  html += ".btn{background:#ff4b2b; color:white; padding:25px; border:none; border-radius:15px; width:90%; font-size:20px; font-weight:bold; cursor:pointer;}";
  html += ".safe-btn{background:#00B4DB; margin-top:20px;}</style></head>";
  html += "<body><h2>AlertX TEST PANEL</h2>";
  html += "<p style='color:#00B4DB;'>Testing MAC: " + DEVICE_MAC + "</p>";
  html += "<p style='color:white;'>IP: " + WiFi.localIP().toString() + "</p>";
  html += "<br><a href='/update?alm=true'><button class='btn'>🚨 TRIGGER FIRE ALERT</button></a><br>";
  html += "<a href='/update?alm=false'><button class='btn safe-btn'>✅ SET TO SAFE</button></a>";
  html += "</body></html>";
  server.send(200, "text/html", html);
}

void handleUpdate() {
  currentAlarmStatus = server.arg("alm"); 
  syncToFirebase(); 
  
  String msg = (currentAlarmStatus == "true") ? "ALARM SENT!" : "SYSTEM SAFE";
  server.send(200, "text/html", "<h3>" + msg + "</h3><p>App Dashboard updated.</p><a href='/'>Back</a>");
}

void syncToFirebase() {
  String uptime = String(millis() / 1000) + "s";
  String csvData = "12,WiFi,Online,98," + currentAlarmStatus + ",None," + uptime;
  sendToFirebase(csvData);
}

void sendToFirebase(String data) {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    String path = FB_URL + "Devices/" + DEVICE_MAC + "/status.json";
    http.begin(path); 
    http.addHeader("Content-Type", "application/json");
    String payload = "\"" + data + "\""; 
    int response = http.PUT(payload); 
    if (response > 0) {
      Serial.println("Firebase Sync Successful: " + data);
    } else {
      Serial.printf("Error: %s\n", http.errorToString(response).c_str());
    }
    http.end();
  }
}