Comments on: ESP32: Getting Started with Firebase (Realtime Database)

By: Dan Pham Le Huu

Dan Pham Le Huu — Fri, 16 May 2025 12:43:35 +0000

Dear Sara,
Thanks for your great tutorial.
I’m encountering an issue with sending and receiving data (almost simultaneously) between Firebase and my ESP32.

I’m using the latest FirebaseClient library for my project.

The callback functions for database.set and database.get work perfectly fine when called independently. However, if I call the .set function first, there’s a significant delay for the .get callback to respond after I change the datachange variable (even though the .set function has completed and the data is already on Firebase). Is this an unavoidable conflict?

I would greatly appreciate your feedback.

By: Sara Santos

Sara Santos — Sun, 27 Apr 2025 09:46:10 +0000

In reply to Al Klein.

Are you referring to this tutorial https://randomnerdtutorials.com/esp32-cam-save-picture-firebase-storage/?

By: Al Klein

Al Klein — Sun, 27 Apr 2025 00:47:38 +0000

In reply to Sara Santos.

“shows how to upload a file to firebase”. You “upload” the file NAME and PATH to the database. You upload the file to the computer’s drive.

Some people think that you should store the file itself in the database, as a BLOB.

By: Sara Santos

Sara Santos — Sat, 26 Apr 2025 10:46:04 +0000

In reply to Al Klein.

Hi.
I’m sorry, but I don’t understand your comment.
In the storage example, we’re storing the file in storage.
Regards,
Sara

By: Al Klein

Al Klein — Fri, 25 Apr 2025 18:25:12 +0000

In reply to Renzo. The smartphone, when set up as a hotspot, IS the router.

By: Al Klein

Al Klein — Fri, 25 Apr 2025 18:21:07 +0000

In reply to Sara Santos. Storing files in a database id the.bad.idea.of.the.year. Store the complete path to the file in the database. Save the file itself to storage.

By: Sara Santos

Sara Santos — Thu, 17 Apr 2025 09:12:06 +0000

In reply to Renato Soares Bigio.

Hi.
The newest library works in a different way.
We’re currently working to update our Firebase tutorials.
Next, week, we’ll post an updated version of this article.
Regards,
Sara

By: Renato Soares Bigio

Renato Soares Bigio — Wed, 16 Apr 2025 18:20:13 +0000

Sara, good afternoon!. I’m Brazilian, sorry for my English… testing the first example (ESP32 Store Data to Firebase Database) and using the “Firebaseclient.h” library, I got the error: “Compilation error: addons/TokenHelper.h: No such file or directory”; I then changed to the “FirebaseESP32.h” library; the error above no longer appeared, but it started to display the error: “‘FB_RTDB FirebaseESP32::RTDB’ is private within this context”; this error refers to the commands “Firebase.RTDB.setInt” and “Firebase.RTDB.setFloat”; after removing these commands the sketch compiled and ran OK. What can be done then?

By: Sara Santos

Sara Santos — Wed, 09 Apr 2025 09:36:36 +0000

In reply to Jude.

Hi.
That’s great.
Thanks for letting me know.
Regards,
Sara

By: Jude

Jude — Wed, 09 Apr 2025 04:39:05 +0000

Hi Sara,
I used the same code in above example and updated the library. After updating the library there was bad request error reading and writing to the database. The code was working before and my database path had two words with space in between and then i used new path for database with out space and now it is working perfectly fine.

Regards
Jude