Is there any way I can replicate this with ESP8266 without getting into the realm of exposing a secure MQTT broker to the internet?
Ideally I'd like to use ZeroTier to effectively have my ESPs talking to a LAN MQTT broker, and have ZeroTier manage the secure aspect of the connection, but I don't think this will work on the ESPs.
I also don't really want to have to use an RaPi Zero W as an 'edge device', but I think that's probably what I'll have to end up doing?!
Any guidance most welcome.