Acces a variable in the library

Projects Programming
8

Thanks for the answer,
My Code

#include <ESP8266WiFi.h>
#include <FirebaseArduino.h>

#define FIREBASE_HOST "example.firebaseio.com"
#define FIREBASE_AUTH "token_or_secret"
#define WIFI_SSID "SSID"
#define WIFI_PASSWORD "PASSWORD"

void setup() {
  Serial.begin(9600);
  //Reach internet to a website and read fingerprint
  char kFirebaseFingerprint[60] =
    "6E:F3:55:47:6D:F1:0E:5B:2B:04:F2:F8:C0:8B:E8:05:65:0F:1A:C1"; // 2021-09
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("connecting");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.println();
  Serial.print("connected: ");
  Serial.println(WiFi.localIP());

  Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);
}

int n = 0;

void loop() {
  // set value
  Firebase.setFloat("number", 42.0);
  // handle error
  if (Firebase.failed()) {
    Serial.print("setting /number failed:");
    Serial.println(Firebase.error());
    return;
  }
  delay(1000);

  // update value
  Firebase.setFloat("number", 43.0);
  // handle error
  if (Firebase.failed()) {
    Serial.print("setting /number failed:");
    Serial.println(Firebase.error());
    return;
  }
  delay(1000);

  // get value
  Serial.print("number: ");
  Serial.println(Firebase.getFloat("number"));
  delay(1000);

  // remove value
  Firebase.remove("number");
  delay(1000);

  // set string value
  Firebase.setString("message", "hello world");
  // handle error
  if (Firebase.failed()) {
    Serial.print("setting /message failed:");
    Serial.println(Firebase.error());
    return;
  }
  delay(1000);

  // set bool value
  Firebase.setBool("truth", false);
  // handle error
  if (Firebase.failed()) {
    Serial.print("setting /truth failed:");
    Serial.println(Firebase.error());
    return;
  }
  delay(1000);

  // append a new value to /logs
  String name = Firebase.pushInt("logs", n++);
  // handle error
  if (Firebase.failed()) {
    Serial.print("pushing /logs failed:");
    Serial.println(Firebase.error());
    return;
  }
  Serial.print("pushed: /logs/");
  Serial.println(name);
  delay(1000);
}

Header File

#ifndef FIREBASE_HTTP_CLIENT_H
#define FIREBASE_HTTP_CLIENT_H

#include <string>

#include "Arduino.h"
#include "Stream.h"

struct HttpStatus {
  static const int TEMPORARY_REDIRECT = 307;
};

class FirebaseHttpClient {
 public:
  static FirebaseHttpClient* create();

  virtual void setReuseConnection(bool reuse) = 0;
  virtual void begin(const std::string& url) = 0;
  virtual void begin(const std::string& host, const std::string& path) = 0;

  virtual void end() = 0;

  virtual void addHeader(const std::string& name, const std::string& value) = 0;
  virtual void collectHeaders(const char* header_keys[],
                              const int header_key_count) = 0;
  virtual std::string header(const std::string& name) = 0;

  virtual int sendRequest(const std::string& method, const std::string& data) = 0;

  virtual std::string getString() = 0;

  virtual Stream* getStreamPtr() = 0;

  virtual std::string errorToString(int error_code) = 0;

  virtual bool connected() = 0;

 protected:
  static const uint16_t kFirebasePort = 443;
};
extern char kFirebaseFingerprint[60];

#endif  // FIREBASE_HTTP_CLIENT_H