TLS Connections in Echo Client/Server Demo

[ghost]

I have been able to get the "Echo Client/Server" demo working over OpenThread and TCP using two nRF52840dk's and a Raspberry Pi with nRF52840dongle as the border router. Thank you to everyone for the advice in #7784 to get it working up to this point.

My client serial commands below resulted in the image above, where the data bytes in the image are hex for "test 12345" (to spare you the conversion).

uart:~$ net tcp connect fd3c:f7d2:31ba:1:7786:d18f:456c:7468 4242  
uart:~$ net tcp send "test 12345"

When I attempt to include both my "prj.conf" and "overlay-tls.conf" to enable TLS, I receive the following -22 error during zsock's accept() call when trying to execute "net tcp connect ..." like I did above. Could you please help me understand why I am getting this error and how I can correct it? It seems that I am close - the Wireshark trace shows the SYN handshake but then immediately closes with FIN.

Server board serial output:

Client board serial output:

relevantServerFiles.zip
relevantClientFiles.zip