Re: [wakaama-dev] DTLS handshake errors

[Simon Bernard <sbernard@xxxxxxxxxxxxxxxxxx>]

Hi, I'm curious to know how you re-handshake ? could you share this part of your code  to allow us to see if there is a problem ?

Le 16/01/2017 à 10:46, Riccardo Pozza a écrit :

Hi all,

 

I’ve upgraded recently to DTLS communication on my lwm2m client.

 

Sometimes I need to re-handshake with DTLS for re-registration and I rarely get errors, but I do get them during the handshake procedure.

Examples thereof:

è Error DTLS handling message -552.

o   The message sequence number is too small, expected XXXX, got 0:

è WARN, Wrong epoch, expected X, got 0

Sometimes I just see the initial ClientHello packet sent and no reply whatsoever.

 

The issue in this case is that the client blocks and never gets out unless rebooted, which I’d like to avoid.

What is the behaviour on the failed DTLS handshake?

Is it possible to render this non-blocking?

 

Thanks and Kind Regards,

Riccardo.

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