Connecting to Azure Iot Hub fails at device certificates

RE: Connecting to Azure Iot Hub fails at device certificates

Byter — Wed, 22 May 2024 12:22:09 GMT

I got it working. What I did was follow this tutorial from Microsoft again but this time, instead of using the device id (CN) like the tutorial from Nordic, I used device##. This means that the evaluation board is able to connect using certificates but following the official tutorial from Nordic didn't work. My guess is that the issue is with the CN, that nrfcredstore uses by default is invalid in some sort of way. In case it's different than the usual, for me it was something like: #####-####-########-### (not exact number of #'s) that instead of # there was a letter or a number. And somehow this string was either invalid as a CN or as a device name for Azure Iot Hub. Whatever it was, it's working now so this issue can be marked as resolved

P.S. There's always the chance that I did something wrong each time I tried but the last time

RE: Connecting to Azure Iot Hub fails at device certificates

Byter — Sun, 19 May 2024 07:26:46 GMT

I'll try. Right now I don't have access to the azure support from my account because of where we created it from. So you're saying that you don't see anything abnormal with the terminal session and in general?

RE: Connecting to Azure Iot Hub fails at device certificates

Hakon — Tue, 14 May 2024 11:06:08 GMT

[quote user="Byter"]Is there some azure iot hub configuration that I should share?[/quote]

I don't know. Have you tried contacting Azure support team? Perhaps they have more insight into what is going on.

RE: Connecting to Azure Iot Hub fails at device certificates

Byter — Sun, 12 May 2024 09:25:50 GMT

I'm not proficient with the TLS handshake but by reading a few articles it seems like it finishes the handshake and only after it fails. Unless I'm understanding it incorrectly.

EDIT: I've now found that "Encrypted Alert" means "Decryption Failed" so I'm digging more into that

Okay so that's indeed an issue with the certificates. The issue is figuring where it went wrong because I followed the docs a couple of times already. Is there some azure iot hub configuration that I should share?

RE: Connecting to Azure Iot Hub fails at device certificates

Hakon — Fri, 10 May 2024 12:12:36 GMT

Then maybe if you did a modem trace that would indicate what's wrong.

RE: Connecting to Azure Iot Hub fails at device certificates

Byter — Fri, 10 May 2024 11:28:54 GMT

The certificates have been indeed written into the modem

RE: Connecting to Azure Iot Hub fails at device certificates

Hakon — Fri, 10 May 2024 11:20:07 GMT

You can use the command to read out the certificates, so you know that they have been written to the modem.

RE: Connecting to Azure Iot Hub fails at device certificates

Byter — Fri, 10 May 2024 11:15:56 GMT

Hey, I meant using the nrfcredstore method from the documentation. Meaning I wrote the certificates that were generated from the cmd tool.

Unless nrfcredstore uses the at%cmng command behind the scenes of nrfcredstore COM3 list, I haven't tried it

RE: Connecting to Azure Iot Hub fails at device certificates

Hakon — Fri, 10 May 2024 09:05:41 GMT

Hello,

[quote user=""]Use nrfcredstore to add the certificates to the device[/quote]

What certificates did you write to the modem? Have you tried reading them out with at%cmng?