Unable to connect NodeMCU with Firebase as console shows setting /number failed: each time

Question

Unable to connect NodeMCU with Firebase as console shows setting /number failed: each time No updation on firebase as well.

or should I change the cloud server?

Answer 1

The Firebase Arduino library has a reference to a fingerprint of the Firebase SSL certificate. This fingerprint may not match the current fingerprint.

This fingerprint is in FirebaseHttpClient.h (typically in C:\Users\<User>\Documents\Arduino\libraries\firebase-arduino-<version>\src\FirebaseHttpClient.h).

To find and change the current fingerprint:

1. Go to https://www.grc.com/fingerprints.htm
2. Enter "test.firebaseio.com"
3. Record the fingerprint (e.g. it is currently 03:9E:4F:E6:83:FC:40:EF:FC:B2:C5:EF:36:0E:7C:3C:42:20:1B:8F
4. OpenC:\Users\<User>\Documents\Arduino\libraries\firebase-arduino-<version>\src\FirebaseHttpClient.h
5. Replace value of kFirebaseFingerprint with the fingerprint (without colons)
6. Recompile

e.g. the following fingerprint works at this point of time:

static const char kFirebaseFingerprint[] =
  "03 9E 4F E6 83 FC 40 EF FC B2 C5 EF 36 0E 7C 3C 42 20 1B 8F";

See https://github.com/FirebaseExtended/firebase-arduino/issues/328