Arduino code that lets you accsess heroku site

post

#include <Arduino.h> 
#include <ArduinoJson.h>
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <ESP8266HTTPClient.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>
#include <WiFiClientSecureBearSSL.h>
// Fingerprint expires soon, needs to be updated
const uint8_t fingerprint[20] = {0x08, 0x3b, 0x71, 0x72, 0x02, 0x43, 0x6E, 0xCA, 0xED, 0x42, 0x86, 0x93, 0xBA, 0x7E, 0xDF, 0x81, 0xC4, 0xBC, 0x62, 0x30};

#define DHTPIN 2
#define DHTTYPE DHT11

DHT_Unified dht(DHTPIN, DHTTYPE);

ESP8266WiFiMulti WiFiMulti;
String idList[4] = {"5d3050c453c0120a78d6282a", "5d304e7653c0120a78d62824", "5d3051bf53c0120a78d62833", "5d31ab50d1590f38248ab204"};

void setup()
{
  dht.begin();
  randomSeed(123);
  Serial.begin(115200);
  // Serial.setDebugOutput(true);

  Serial.println();
  Serial.println();
  Serial.println();

  for (uint8_t t = 4; t > 0; t--)
  {
    Serial.printf("[SETUP] WAIT %d...\n", t);
    Serial.flush();
    delay(1000);
  }

  WiFi.mode(WIFI_STA);
  WiFiMulti.addAP("Be_Curious", "pulpoparacomer");
  
}

void loop()
{
  // wait for WiFi connection
  if ((WiFiMulti.run() == WL_CONNECTED))
  {
    std::unique_ptr<BearSSL::WiFiClientSecure>client(new BearSSL::WiFiClientSecure);

    client->setFingerprint(fingerprint);
    

    HTTPClient https;

    Serial.print("[HTTPS] begin...\n");
    if (https.begin(*client, "https://platform-device.herokuapp.com/save-data"))
    { // HTTPS

      Serial.print("[HTTPS] POST...\n");
      https.addHeader("Content-Type", "application/json");
      sensors_event_t event;
      dht.temperature().getEvent(&event);
      int number = event.temperature;
      int httpCode = https.POST("{\"deviceId\" : \""+String(idList[0])+"\", \"value\" : " + String(number) + "}");

      if (httpCode > 0)
      {

        Serial.printf("[HTTPS] GET... code: %d\n", httpCode);

        // file found at server
        if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY)
        {
          StaticJsonDocument<808> doc;
          
          String payload = https.getString();
          Serial.println(payload);

        }
      }
      else
      {
        Serial.printf("[HTTPS] GET... failed, error: %s\n", https.errorToString(httpCode).c_str());
      }

      https.end();
    }
    else
    {
      Serial.printf("[HTTPS] Unable to connect\n");
    }
  }

  Serial.println("Wait 1s before next round...");
  delay(900);
}