Hi Simon,
Thanks a lot
for your help.
Sure, when I
upgraded from no security to DTLS, I added a
lwm2m_close_connection() on STATE_BOOTSTRAP_REQUIRED (please
see snippet below).
Not sure it
was the right thing to do, but it does trigger a new
handshake with PSK.
Otherwise
the re-registration subsequent to changing to STATE_INITIAL
would not happen as it was happening with no security, i.e.
the registration packet is sent but ignored by the server in
case of DTLS.
Thanks and
Kind Regards,
Riccardo.
------------------------------------------------------------------------------------------------------------------
In
“lwm2mclient.c” :
result = lwm2m_step(lwm2mH,
&(tv.tv_sec));
switch (lwm2mH->state)
{
case
STATE_INITIAL:
break;
case
STATE_BOOTSTRAP_REQUIRED:
{
lwm2m_server_t *
targetP = lwm2mH->serverList;
while (targetP !=
NULL)
{
if (targetP->sessionH != NULL)
{
lwm2m_close_connection(targetP->sessionH,
lwm2mH->userData);
targetP->sessionH = NULL;
}
targetP = targetP->next;
}
lwm2mH->state =
STATE_INITIAL;
break;
}
case
STATE_BOOTSTRAPPING:
break;
case
STATE_REGISTER_REQUIRED:
break;
case
STATE_REGISTERING:
break;
case
STATE_READY:
break;
default:
break;
}
------------------------------------------------------------------------------------------------------------------
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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