Hi, I wish to study security protocols in IoT and how the impact the performance of constrained devices. My goal is to compare CoAP vs CoAPs (secured with DTLS). Recently I stumbled upon libcoap and I've tested in my Ubuntu the unsecured version https://github.com/obgm/libcoap/tree/master And the secured version (though it is seems really outdated) https://github.com/obgm/libcoap/tree/dtls
I managed to run smoothly both examples following this tutorial http://morschi.com/2017/04/04/using-dtls-enabled-coap-clients/ Capturing the traffic using wireshark listening on the loopback interface, in the coap example it captured 2 packets the GET and the ACK with the resource, in the coaps example it captured a multitude of packets bounded to the handshake protocol. Now I need to test in a constrained environment, I have some cc2538 motes, and the goal is to test using RIOT pushing the code in the motes (1 client-mote and 1 server-mote) studying the performance. So basically I'm asking how can I integrate libcoap in RIOT OS and replicate the the above coap/coaps client-server example using RIOT (can't find any libcoap examples inside RIOT/examples folder, though in RIOT/pkg there is the libcoap app). If libcoap is not fit for the task can you suggest other implementations of CoAP client-server and CoAPs client-server? I'm really struggling to find DTLS implementation of CoAP. Thanks
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