Hi @mterwoord,
You mean just installing the Update Modules on the client? Or would you like to generate Update Module Artifacts during a Yocto build as well?
You can make sure the Update Modules are installed by providing the following packageconfig as is done in meta-mender-demo,
We do not have any classes to generate the actual Update Module artifacts, this is very depended on what Update Module you are using and hard to create generic solutions.
I have started on writing something for the dir-overlay module, this can work as inspiration.