I'm the author of a Yocto Project layer called meta-erlang. I would like to announce that now is possible to use Yocto Project which build a embedded Linux distro and on top of that install the EMQ (an mqtt broker) or EMQ edge. I've created the recipe and all the patches necessary to do that.
My main target is to bring software made with Erlang/Elixir possible to run in Yocto/Openembedded ecosystem.
Just in case, if you have a embedded project and are planing to run emq edge, for example. This could be feasible for you.