Implement and simulation DTLS protocol by omnetpp

I want to make wireless secure communication between two nodes i.e. a client and server, by using DTLS protocol. The server sends videostreaming to the client by using UDP protocol but it is required client and server authorize each other before sending the video. During sending the video, the server needs to check client is still alive or not. To this end, DTLS uses the HeartbeatRequest and the HeartbeatResponse. It means the server sends HeartbeatRequest and the client send-back HeartbeatResponse. I need to test it under different attacks. This project should simulate OpenSSL library in OMNETPP.