Seems like not a particularly good idea. At least by default SSL isn’t supported. So you want to send plain text over IPv6 to control your garage door?
I was thinking of writing a small proxy that could support IPv6, SSL, and be secure/robust enough to be Internet facing. Similarly I’m pondering an android app, but I want it to be self hosting. I’d rather not depend on IFTTT or Blynk and worry about downtime, billing changes, bankruptcy, changes to pricing model, being hacked, etc.
I’ve been trying to get MQTT to do something, but so far I’ve got it to connect, but not log anything of interest. Still digging around for docs or examples.