If you build your app on a PC with your build of SDL, does it work under wayland/weston? That's probably a good place to start debugging.
Once that's working, if you have a 16.04 VM set up with unity8 installed, I would build an x86 version of the click, install it in the VM, and see what works.
Once both of those are working, it should also work on phones/tablets, once the remaining bits to get wayland clients working there are done.