As has already been mentioned, having reliable WIFI or cell service availabl and having it available if you loose power will determine what you can use. Either system from
Marcell or
RV PetSafety use a cellular network (Verizon or AT&T) so no WIFI is required and are subscription based so there is an ongoing cost so if considering this technology, compare features and costs and see what works for you.
Other options that are available if you have reliable WIFI include temperature monitors that will connect to your own WIFI network. The advantage with this type is that there is no ongoing subscription costs. A recommended unit is the
GOVEE Temperature device. Read
David Bott's Review. Disadvantage with this is that it does not notify if power is lost-just when temp and humidity are out of the desired ranges. I have AGS so power is restored automatically via the generator if electrical loss creates a demand.
I have used both the RV PetSafety and the GOVEE Temperature units and can attest that each work as advertised and will perform the function(s) you are asking about. You must look at what your needs are and then look at the technology that works in your situation.