I want to program a vehicle in OMNET++ as an SDN controller, but I don't know how to get started.
I am using SUMO, VEINS and OMNET++.
If you are able to run a simulation of mobile hosts doing SDN based on the INET Framework, you can then use Veins (e.g. version 4.7.1) to have your hosts behave like vehicles. Your simulation would just need to use the veins_inet
project.