Hey Mate, couldn't agree more to Mr. Harbinger.
I was facing exactly the same problems as you do now.
I was also travelling because of work. I installed a HydrobSystem for 2 plants and a monitorsystem (taylormade by myself) for RH/ Temp and moisture of the soil and and and ...
I never found healthy plants when I came back. It's a very big and expensive effort. Due to that there r so many variables, I do not think it'll work properly... sorry mate..😔
But if you goin to develope something, feel free to shoot me a PM, I'm happy to help..
Rock on, cheerz.... O.✌️