When I try to establish a connection with TLS 1.2 and one of the DHE-PSK-* ciphers, the server aborts it with the message:

4087A703F27F0000:error:0A00018A:SSL routines:tls_construct_server_key_exchange:dh key too small:ssl/statem/statem_srvr.c:2484:

That's because it loads 1024 bit DH parameters by default.

At the very least, I think the default parameters should be increased to 2048 bit.
I'm not sure if the server should query the minimal key size to select DH parameters so that it continues to work in the future...

Using master f772086

Reproducer:

openssl s_server  -cipher @SECLEVEL=2:DHE-PSK-AES128-CCM -nocert -psk 0102030405 -www

and on separate console:

openssl s_client -connect localhost:4433 -cipher DHE-PSK-AES128-CCM  -psk 0102030405 -no_tls1_3