Relative Humidity and Temperature data on Web with https Μετρήσεις σχετικής υγρασίας και θερμοκρασίας στο δίκτυο με https

 #include <WiFi.h>

#include <WiFiClientSecure.h>

#include <HTTPClient.h>

#include <DHT.h>

#include <ArduinoJson.h>

// WiFi credentials Put your own wifi values below

const char* ssid = "xxxxxxxxxxxxxxxxx";

const char* password = "xxxxxxxxxxxxxxxxxx";

// Server details - USE HTTPS with the correct URL

// Use the exact address of the receiving php script

const char* serverURL = "https://*******************";

// Root Certificate for your domain - REPLACE WITH YOUR CERTIFICATE

const char* root_ca = \

"-----BEGIN CERTIFICATE-----\n" \

"MIIGIjCCBQqgAwIBAgISBVPl+mMmdTdH9OqNeC4ajXNtMA0GCSqGSIb3DQEBCwUA\n" \

"MDMxCzAJBgNVBAYTAlVTMRYwFAYDVQQKEw1MZXQncyBFbmNyeXB0MQwwCgYDVQQD\n" \

"EwNSMTMwHhcNMjUwOTI5MDQyMjI5WhcNMjUxMjI4MDQyMjI4WjAgMR4wHAYDVQQD\n" \

"ExV3ZWJkaXNrLm1lZ2FrYXN0cm8uZ3IwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAw\n" \

"ggEKAoIBAQDSeKYkxn8e0J859W6igXo6agyKuo4UFTZXE4UII5V5K9hKyYrIsbOz\n" \

"iMHNy0eWxzrz4wNSTnpjsAPcH4kZLn+m0CRYjhMu5YixQOCpPTTW+XvAiWdk2yJ9\n" \

"hfBKb5BOiTehrIV4BcydUJlbHzLiN9JGeUgZDsi2Q4K9YfR3VNKGjmzKgRDZL3p+\n" \

"a7bMhDjGRT/bTcf4cW7Mb3vUSc4iZXraVw+ybP1khEnD+qgysP32RjnZkoAwvsEI\n" \

"6PfAfRpRgoU+54NHVKVwnmmPpavGgaK6/xajaS/P/hmD1519z9oUpPNfKpCo6imi\n" \

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"BAMCBaAwHQYDVR0lBBYwFAYIKwYBBQUHAwEGCCsGAQUFBwMCMAwGA1UdEwEB/wQC\n" \

"MAAwHQYDVR0OBBYEFG4YfYSohVWwATWxhZGeyjvkjrpTMB8GA1UdIwQYMBaAFOer\n" \

"nw8sM6BT015PeMiyhA471pIzMDMGCCsGAQUFBwEBBCcwJTAjBggrBgEFBQcwAoYX\n" \

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"bGVuZGFycy5tZWdha2FzdHJvLmdyghhjcGNvbnRhY3RzLm1lZ2FrYXN0cm8uZ3KC\n" \

"Em1haWwubWVnYWthc3Ryby5ncoIUbWVnYTIwMTAucGFuLXRvdS5jb22CDW1lZ2Fr\n" \

"YXN0cm8uZ3KCFXdlYmRpc2subWVnYWthc3Ryby5ncoIVd2VibWFpbC5tZWdha2Fz\n" \

"dHJvLmdyghh3d3cubWVnYTIwMTAucGFuLXRvdS5jb22CEXd3dy5tZWdha2FzdHJv\n" \

"Lmdyghl3d3cueHJhY2luZy5tZWdha2FzdHJvLmdyghV4cmFjaW5nLm1lZ2FrYXN0\n" \

"cm8uZ3IwEwYDVR0gBAwwCjAIBgZngQwBAgEwLwYDVR0fBCgwJjAkoCKgIIYeaHR0\n" \

"cDovL3IxMy5jLmxlbmNyLm9yZy8xMTAuY3JsMIIBAwYKKwYBBAHWeQIEAgSB9ASB\n" \

"8QDvAHYA7TxL1ugGwqSiAFfbyyTiOAHfUS/txIbFcA8g3bc+P+AAAAGZk+rBFwAA\n" \

"BAMARzBFAiAzPV3xw/prqTrfe1/XlIGSwwpDyDmbBGQ3LshiJBj2XgIhAK4/j8e5\n" \

"FWYs5GVboifZGnOyoCGl8VXIQZj9eXyggZlhAHUAGYbUxyiqb/66A294Kk0BkarO\n" \

"LXIxD67OXXBBLSVMx9QAAAGZk+rBIgAABAMARjBEAiAgC9ul691KegvwvIR3mnB1\n" \

"v4RB6OHurJA0sS0ogpZo0AIgNMO8XlCuSPbaxGs+M0O5CyyAs2ZXJ1FI5XE9GZLZ\n" \

"TfYwDQYJKoZIhvcNAQELBQADggEBAE/GyzEIqFOTz/8DLusY7SbeyNYCv7tvsKs7\n" \

"LF/AJe1CPmsfKksjSDjXUKt6TA5i3zcbdnoArNkhi13qmGNsNii5GFtTT1uePdVr\n" \

"FwUlkooaZ4kiKTDT2S/jw6iOe8CmvCqscdu3cnvJ3ZBmYUQALHIS9Z5IZWCYS93H\n" \

"n1IJ/kmmXtxeAFn/ZnYzaJQaMHxv3wZ571zIe0pNiupl+XVoodX+wZS+N1PRoQK1\n" \

"jxinubI9eP7VfaODYB9qKKdAHa1NePpBxcMnzZzLpOSSc0fYsCgg3yQNxhkSjWTB\n" \

"wh5Xjg8tttdduXphsNk+A9U5Hc/wOYO873HAMhsjULMGnfOzWAA=\n" \

"-----END CERTIFICATE-----\n";

// DHT11 sensor configuration

#define DHT_PIN 4

#define DHT_TYPE DHT11

DHT dht(DHT_PIN, DHT_TYPE);

// Sensor data structure

struct SensorData {

  float temperature;

  float humidity;

  bool valid;

};

// Device identifier

const String deviceId = "ESP32_DHT11_01";

void connectToWiFi() {

  Serial.print("Connecting to WiFi");

  WiFi.begin(ssid, password);

 

  int attempts = 0;

  while (WiFi.status() != WL_CONNECTED && attempts < 20) {

    delay(1000);

    Serial.print(".");

    attempts++;

  }

 

  if (WiFi.status() == WL_CONNECTED) {

    Serial.println("\n✓ WiFi connected!");

    Serial.print("IP Address: ");

    Serial.println(WiFi.localIP());

  } else {

    Serial.println("\n✗ WiFi connection failed!");

  }

}

SensorData readSensorData() {

  SensorData data;

  data.valid = false;

 

  float temp = dht.readTemperature();

  float hum = dht.readHumidity();

 

  // Check if readings are valid

  if (isnan(temp) || isnan(hum)) {

    Serial.println("Failed to read from DHT sensor!");

    return data;

  }

 

  data.temperature = temp;

  data.humidity = hum;

  data.valid = true;

 

  Serial.printf("Sensor readings - Temperature: %.2f°C, Humidity: %.2f%%\n", temp, hum);

  return data;

}

bool sendDataViaHTTPS(SensorData data) {

  WiFiClientSecure *client = new WiFiClientSecure;

  HTTPClient https;

 

  client->setInsecure();

  client->setTimeout(60000);

 

  Serial.println("Attempting HTTPS connection to: " + String(serverURL));

 

  if (https.begin(*client, serverURL)) {

    https.setTimeout(30000);

    https.setConnectTimeout(15000);

   

    // Set headers for JSON

    https.addHeader("Content-Type", "application/json");

    https.addHeader("User-Agent", "ESP32-DHT11-Client");

   

    // Create JSON data

    String jsonData = "{\"device_id\":\"" + deviceId +

                     "\",\"temperature\":" + String(data.temperature, 2) +

                     ",\"humidity\":" + String(data.humidity, 2) + "}";

   

    Serial.println("Sending JSON data: " + jsonData);

   

    // Send POST request with JSON data

    int httpCode = https.POST(jsonData);

   

    Serial.print("HTTP Response code: ");

    Serial.println(httpCode);

   

    if (httpCode > 0) {

      if (httpCode == HTTP_CODE_OK) {

        String response = https.getString();

        Serial.println("✓ Success! Server response: " + response);

        https.end();

        delete client;

        return true;

      } else {

        Serial.printf("HTTP Error: %d\n", httpCode);

        String response = https.getString();

        Serial.println("Error response: " + response);

      }

    } else {

      Serial.printf("HTTPS POST failed, error: %s\n", https.errorToString(httpCode).c_str());

    }

   

    https.end();

  } else {

    Serial.println("Unable to begin HTTPS connection");

  }

 

  delete client;

  return false;

}

void setup() {

  Serial.begin(115200);

  Serial.println("ESP32 DHT11 HTTPS Client Starting...");

 

  // Initialize DHT sensor

  dht.begin();

  delay(2000);

 

  // Connect to WiFi

  connectToWiFi();

 

  Serial.println("Setup completed successfully!");

}

void loop() {

  // Check WiFi connection

  if (WiFi.status() != WL_CONNECTED) {

    Serial.println("WiFi disconnected! Attempting to reconnect...");

    connectToWiFi();

    delay(5000);

    return;

  }

 

  // Read sensor data

  SensorData data = readSensorData();

 

  if (data.valid) {

    // Send data to server via HTTPS

    bool success = sendDataViaHTTPS(data);

   

    if (success) {

      Serial.println("✓ Data successfully sent to server");

    } else {

      Serial.println("✗ Failed to send data to server");

    }

  } else {

    Serial.println("✗ Invalid sensor data, skipping transmission");

  }

 

  // Wait before next reading

  Serial.println("Waiting 5 minutes for next reading...");

  delay(300000);

}