Backgroud: I am doing an IOT with my room AC, it works fine on LAN(local area wifi). Now, I want to take it to the next level, that is contr it remotely, over the internet. I have gathered the following
Option 1: use a cloud service. Requires alot of work. Not interested. Option 2: use DMZ router method. This takes a little time to setup but present a cyber security threat.
Question: what exactly is the security threat if use option 2 with my esp8266 device? What if someone find my ip for the said device, what can they do with it?