Chencheng Zhang

> I did a little research and found that OpenSSL [does not](https://github.com/openssl/openssl/issues/3283) support this and Mbed TLS [does](https://github.com/ARMmbed/mbedtls/issues/204). > > Also from reading the discussions there I realized that a...

Hi @gordonklaus . Thanks for your reply! As for a client-server connection, the server has to be able to accept an ephemeral port connection right? When using this `pion/dtls` `ListenAndServeDTLS`,...

@gordonklaus Thanks a lot. But I confirmed in my project that we are not going to use an ephemeral port in our client. Well, it would be super nice if...

Also a memory map on the machine regarding the server process (not sure if it is helpful): ``` # cat /proc/715/maps 4000000000-4004000000 rw-p 00000000 00:00 0 558b560000-558b6a4000 r-xp 00000000 00:13...

As the time flies, there are more clients that could not reach server now: D00124B0023767B6E D00124B0023767951 D00124B002376813A Server log is here: https://klistra.in/ADdFM3qn

@jkralik Thanks! I have made a replication with your suggestions. I have some modification on your `go-coap` as well as `pion/dtls` due to the limitation of our client: https://github.com/rtechencheng/dtls/tree/develop (There...

Just to provide one more sample. Devices of interest (lost) are: D00124B00237686E2 D00124B0023767815 D00124B0023766899 D00124B00237672E3 Log of server: [green-coap-server-09292200.log](https://github.com/plgd-dev/go-coap/files/7259111/green-coap-server-09292200.log) Log of tunnel traffic: [green-br-log-09292200.log](https://github.com/plgd-dev/go-coap/files/7259115/green-br-log-09292200.log)

Yeah, I am trying with that. But how to get rid of `ServerKeyExchange` or simply get rid of `Certificate` when using PSK? As `Certificate` is indicated as optional in the...

But the documentation says: ``` // Certificates contains certificate chain to present to the other side of the connection. // Server MUST set this if PSK is non-nil // client...

Well, actually I am running [a coap server](https://github.com/plgd-dev/go-coap/blob/master/examples/dtls/psk/server/main.go). But my client which uses [tinydtls](https://github.com/contiki-ng/tinydtls) still complains that it receive a `received handshake packet of type: server_key_exchange (12)` but it is...