Michael, On 2021-07-21, Michael Richardson <mcr+i...@sandelman.ca> wrote:
> Esko Dijk <esko.d...@iotconsultancy.nl> wrote: > > There is already a "CoAP ping" described in RFC 7252 that can be > > used. It does not access any resource, just the CoAP server endpoint at > > CoAP message layer. As a side effect of this ping your DTLS stack will > > set up the connection which is handy. > > I recalled that later in the day that CoAP "ping" is not connected to CoAP > "echo" :-) > I think that there is also potentially a need for a way to debug possible MTU > issues. > Is there a way to use Olaf's "coap-client" to do the ping? -K does that, see man coap-client (https://libcoap.net/doc/reference/develop/man_coap-client.html): -K interval Send a ping after interval seconds of inactivity. If not specified (or 0), keep-alive is disabled (default). It would be not difficult to create a dedicated coap-ping, though. > I don't see an option, and it also doesn't seem to be commonly built > with DTLS. It is automatically built with DTLS if you have either GnuTLS, OpenSSL, Mbed TLS with headers installed (--enable-dtls is default). Grüße Olaf
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