Temp monitor for when leaving dogs in RV

I know this topic has been touched on before, but is there any good devices out there that will monitor rv inside temps while dogs are left alone while we are out for the day? I always worry the campground will blow a fuse or lose power while we are out, and dogs get cooked up. Looking for something that would notify my phone in the case of power loss.

I used to use "connectsense", buts its outdated and no longer works.

Thanks!