So, I have almost got the Smartthings Integration working.
I signed up for nabu-casa, to see if that would help - it does!!
My external address works great.
Now, when I try to add the Smartthing integration, nothing happens.
Apparently, this is because there are orphan install attempts, and i need to remove them.
I installed Python, and installed the removal tool (way outside my normal comfort zone).
Now when I try to use the removal tool, either I am doing something wrong, or it just does not work.
This is the last integration I really need to make HA successful, and useful.
Please help!!