DNS Failed for xxxxxxxx.firebaseio.com

[marius240]

I get a very weird error,

it works if i do this:

void loop() {

  Firebase.setString("lul","lul");

}

But if i just do:

void loop() { 
  Firebase.setString("lul","lul");
   esp_sleep_enable_timer_wakeup(1000000);
   esp_deep_sleep_start();
}

i get the error(in serial monitor with debug level = debug): DNS Failed for a-green-home.firebaseio.com and then

[E][WiFiClientSecure.cpp:118] connect(): start_ssl_client: -1 [D][HTTPClient.cpp:970] connect(): failed connect to a-green-home.firebaseio.com:443 [W][HTTPClient.cpp:1262] returnError(): error(-1): connection refused [W][HTTPClient.cpp:1262] returnError(): error(-4): not connected

[marius240]

did mean to close it ): still need help

[marius240]

dindt*

[kiralikbeyin]

https://github.com/FirebaseExtended/firebase-arduino/commit/cd5681f59cabdb31c2c50c55a5abc53af78a3280

[marius240]

What is that supposed to mean

[kiralikbeyin]

Your fingerprint is incorrect , download latest commit

  "E2 34 53 7A 1E D9 7D B8 C5 02 36 0D B2 77 9E 5E 0F 32 71 17"; // 2019

[marius240]

If the fingerprint is wrong why does it work when I put it in loop?

[kiralikbeyin]

error(-1): connection refused is simply fingerprint error but

Try to unplug your esp usb arter ever upload Try to adı delay(1000) at the end of your setup Run your loop in

if (Firebase.available()) {
... your code
}

[marius240]

Firebase.available() isnt a function,

get error: class FirebaseESP32 has no member named "available"

[kiralikbeyin]

This lib is for esp8266

[marius240]

Rip, I'm using ioxhops for esp32

[marius240]

W][HTTPClient.cpp:152] beginInternal(): unexpected protocol: https, expected http 13:31:19.746 -> [D][HTTPClient.cpp:181] beginInternal(): host: a-green-home.firebaseio.com port: 443 url: /lul.json?auth=ju3ijoii8592309efiweoi33b3 13:31:20.028 -> [I][ssl_client.cpp:121] start_ssl_client(): WARNING: Use certificates for a more secure communication! 13:31:20.028 -> [E][ssl_client.cpp:33] handle_error(): UNKNOWN ERROR CODE (004E) 13:31:20.028 -> [E][ssl_client.cpp:35] handle_error(): MbedTLS message code: -78 13:31:20.028 -> [E][WiFiClientSecure.cpp:109] connect(): start_ssl_client: -78 13:31:20.028 -> [D][HTTPClient.cpp:846] connect(): failed connect to a-green-home.firebaseio.com:443 13:31:20.028 -> [W][HTTPClient.cpp:1124] returnError(): error(-1): connection refused 13:31:20.028 -> [W][HTTPClient.cpp:1124] returnError(): error(-4): not connected

[mobizt]

@marius240 for ESP32 which you are using libary that uses WiFiClientSecure library.

One reason for error is low memory for MbedTLS to making SSL handshake. Check your free heap, it should be more than 50 - 100 K.

Another reason is bugs in WiFiClientSecure library.

When I create my own Firebase library for ESP32 using WiFiClientSecure library for SSL WiFi connection, it turns out that device is failed to make SSL connection after 3-5 minutes since success connection.

You can try my stable Firebase client library for ESP32 https://github.com/mobizt/Firebase-ESP32

[marius240]

Does your library auto opdate fingerprints?

[mobizt]

@marius240 By default, my library doesn't required or used fingerprint which is the main purpose of my library which will not rely on server's fingerprint. For more secure connection, you can provide root certificate string to Firebase.begin. Usage example

[marius240]

Ok cool, I'll check it out

[marius240]

@mobizt i just tryed printing my free heap, and its about 104k, so im a bit confused

[mobizt]

It may used by libraries you included and global variables.

Do you still get connection refused error for 100k memory?

[marius240]

ye,