This gist is a sample ESP32 code to test Arduino IDE and PlatformIO IDE compilation performance while using Firebase and Telegram library. Read the blog here: https://blog.itsjo.works/improve-iot-development-from-arduino-ide-to-platformio-ide

esp32-firebase-telegram-example.c

#include <Arduino.h>
#include <WiFi.h>
#include <Firebase_ESP_Client.h>
#include <UniversalTelegramBot.h>
#include <ArduinoJson.h>

// --- Replace with your credentials ---
#define WIFI_SSID "YOUR_WIFI_SSID"
#define WIFI_PASSWORD "YOUR_WIFI_PASSWORD"

#define FIREBASE_API_KEY "YOUR_FIREBASE_API_KEY"
#define FIREBASE_DATABASE_URL "YOUR_FIREBASE_DATABASE_URL"

#define BOT_TOKEN "YOUR_TELEGRAM_BOT_TOKEN"
#define CHAT_ID "YOUR_TELEGRAM_CHAT_ID"
// --- End of credentials ---

// Firebase objects
FirebaseData fbdo;
FirebaseAuth auth;
FirebaseConfig config;

// Telegram Bot objects
WiFiClient client;
UniversalTelegramBot bot(BOT_TOKEN, client);

unsigned long lastTimeBotChecked;
const unsigned long botRequestDelay = 1000; // Check for new messages every 1 second

// Function to handle new Telegram messages
void handleNewMessages(int numNewMessages) {
  Serial.println("Handling new messages...");

  for (int i = 0; i < numNewMessages; i++) {
    String chat_id = String(bot.messages[i].chat_id);
    if (chat_id != CHAT_ID){
      bot.sendMessage(chat_id, "Unauthorized user", "");
      continue;
    }

    String text = bot.messages[i].text;
    String from_name = bot.messages[i].from_name;

    Serial.print("Received message from ");
    Serial.print(from_name);
    Serial.print(": ");
    Serial.println(text);

    if (text.startsWith("/update_firebase")) {
      // Command to update Firebase. Example: /update_firebase myValue
      String value = text.substring(text.indexOf(" ") + 1);
      if (value != "") {
        if (Firebase.RTDB.setString(&fbdo, "/telegram/data", value)) {
          bot.sendMessage(chat_id, "Firebase updated successfully with value: " + value, "");
        } else {
          bot.sendMessage(chat_id, "Failed to update Firebase.", "");
          Serial.println(fbdo.errorReason());
        }
      } else {
        bot.sendMessage(chat_id, "Please provide a value to update.", "");
      }
    } else {
      bot.sendMessage(chat_id, "Unknown command. Use /update_firebase [value]", "");
    }
  }
}

void setup() {
  Serial.begin(115200);

  // Connect to Wi-Fi
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("Connecting to Wi-Fi");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(300);
  }
  Serial.println();
  Serial.print("Connected with IP: ");
  Serial.println(WiFi.localIP());

  // Firebase configuration
  config.api_key = FIREBASE_API_KEY;
  config.database_url = FIREBASE_DATABASE_URL;

  // Assign the user sign-in credentials
  auth.user.email = "[email protected]"; // You can use a dummy email for anonymous auth
  auth.user.password = "password";

  Firebase.begin(&config, &auth);
  Firebase.reconnectWiFi(true);

  // Set up a stream to listen for Firebase changes (optional)
  // if (!Firebase.RTDB.beginStream(&fbdo, "/telegram/data")) {
  //   Serial.println("Could not begin Firebase stream");
  // }

  bot.sendMessage(CHAT_ID, "ESP32 Bot is now online!", "");
}

void loop() {
  if (millis() > lastTimeBotChecked + botRequestDelay) {
    int numNewMessages = bot.getUpdates(bot.last_message_received + 1);

    while (numNewMessages) {
      handleNewMessages(numNewMessages);
      numNewMessages = bot.getUpdates(bot.last_message_received + 1);
    }
    lastTimeBotChecked = millis();
  }
}