Firebase connection with nrf5340 and nrf7002 shield

[Epasta]

Hello All,

I implemented the HTTPS call to Amazon using the certificate, and the POST request returns the device ID.
Like you docs: Exercise 2 - Adding TLS to the HTTP connection - Nordic Developer Academy

However, the project we are using does not use Amazon AWS but instead uses Firebase.
I imported the Root GTS R1 certificate (downloadable online), converted it using the appropriate script implemented in CMakeLists.txt.

When I run the code, in debug mode, when loading the certificate, I get this error:

https_client: IPv4 address of server found 216.239.36.54
Socket created
<err> net_sock_tls: Failed to parse CA certificate, err: -0x3b00
https_client: Connect failed : 22

What does this error mean?
I am fairly sure the CA certificate is correct, since I followed the same procedure I used for Amazon.

Also, using SSL commands via the command line, I noticed that Firebase has 3 certificates, while the Nordic link only has 1 (the Amazon one).
Could this be the problem?

Has anyone managed to connect to Firebase?
I am open to any kind of collaboration.

P.S.
When I call Firebase, I am calling the Firebase Functions (HTTPS POST, GET, etc.).

Thanks for any type of support.
Best regards

[Syed Maysum Abbas Zaidi]

Hi,

Thanks for the detailed description. From the log, the failure happens while the device is loading/parsing the CA certificate (Failed to parse CA certificate), before the TLS handshake with Firebase starts. Since the same code works with the Amazon example, the most likely causes are either (a) an issue with the Firebase CA certificate file after conversion, or (b) the certificate using crypto parameters that require slightly different TLS settings. So to help narrow this down, could you please share the following:

1. The exact hostname you are connecting to (for example, the Firebase Functions domain).
2. The exact CA certificate file (.pem) you are provisioning (the one you converted and included in the build).
3. Your nRF Connect SDK version, and whether you are building the non-secure TF-M target, as in the DevAcademy exercise.

Additionally, from a PC, could you please run the following command and paste the output:

openssl s_client -connect <hostname>:443 -servername <hostname> -showcerts

This will show which certificate chain Firebase is using and help us confirm which CA should be provisioned on the device and once we have this information, we can advise whether this is a certificate conversion issue or if any additional TLS configuration is needed.

Best Regards,
Syed Maysum

[Epasta]

Hello and thank you very much for your reply.

My host name is the following:
us-central1-project-fcce5.cloudfunctions.net

Below is what I receive from the SSL call
(openssl s_client -connect <hostname>:443 -servername <hostname> -showcerts)

CONNECTED(000001B8)
---
Certificate chain
 0 s:CN=misc.google.com
   i:C=US, O=Google Trust Services, CN=WR2
   a:PKEY: EC, (prime256v1); sigalg: sha256WithRSAEncryption
   v:NotBefore: Dec  3 15:50:23 2025 GMT; NotAfter: Feb 25 15:50:22 2026 GMT
-----BEGIN CERTIFICATE-----
MIIiWjCCIUKgAwIBAgIQbfyHOPZkJ7cK2IqmGMcRxzANBgkqhkiG9w0BAQsFADA7
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LmRlghh3d3cuenVrdW5mdHN3ZXJrc3RhdHQuZGWCICoubm9ydGhhbWVyaWNhLmFw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-----END CERTIFICATE-----
 1 s:C=US, O=Google Trust Services, CN=WR2
   i:C=US, O=Google Trust Services LLC, CN=GTS Root R1
   a:PKEY: RSA, 2048 (bit); sigalg: sha256WithRSAEncryption
   v:NotBefore: Dec 13 09:00:00 2023 GMT; NotAfter: Feb 20 14:00:00 2029 GMT
-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----
 2 s:C=US, O=Google Trust Services LLC, CN=GTS Root R1
   i:C=BE, O=GlobalSign nv-sa, OU=Root CA, CN=GlobalSign Root CA
   a:PKEY: RSA, 4096 (bit); sigalg: sha256WithRSAEncryption
   v:NotBefore: Jun 19 00:00:42 2020 GMT; NotAfter: Jan 28 00:00:42 2028 GMT
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
---
Server certificate
subject=CN=misc.google.com
issuer=C=US, O=Google Trust Services, CN=WR2
---
No client certificate CA names sent
Peer signing digest: SHA256
Peer signature type: ecdsa_secp256r1_sha256
Negotiated TLS1.3 group: X25519MLKEM768
---
SSL handshake has read 12879 bytes and written 1665 bytes
Verification: OK
---
New, TLSv1.3, Cipher is TLS_AES_256_GCM_SHA384
Protocol: TLSv1.3
Server public key is 256 bit
This TLS version forbids renegotiation.
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
---

This is the cerrtifcate.pem that I'm using (is the last one in code above).

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

I'm using NCS 3.1.1 and at the moment I'm NOT using "non-secure TF-M target".
For building project i'm using  Target: nrf5340dk/nrf5340/cpuapp
But I do not think that should be the problem because with amazon everything is working good.

Thanking you in advance for everything.
Kind regards.