This is very well written and if you don’t mind I would like to help incorporate it into the main code. The documentation alone is worth it (and apologize for the minimal documentation in our code).
In regard to the logging of ET data, I am sure we can incorporate that into the firmware and offload the ET calculation to the weather service. The runtime calculation (using log data) would be calculated on the firmware side.
Also, feel free to submit pull requests to the repo as we are happy to review and merge changes like these.
Thanks!