We camp a lot. I was always concerned about our dog in the camper while being gone during the day if the AC would quit. Today I loaded Tastomta on a D1 mini with a temp sensor. I created a virtual HA install on my home server . I setup the the D1mini to send temp updates to the remote HA server and then send out a SMS if the camper temp gets to high. Perfect and cheap.
Things to consider with this project.
- You will need some type of internet connection at the camper.
- D1 mini and internet should be on battery backup ( i use the usb ports of a laptop) incase AC power goes out.
- Since I have my mqtt broker open to the internet, i created an dedicated HA with secure password mqtt broker.