the Sonoff application notes seem to be missing :( I finally replaced my USB to serial replaced and was going to build some more.
http://brucontrol.com/wp-content/uploads/2017/06/BruControl-Application-Note-Sonoff-Fermentation-Controller.pdf
The current one is working great for the freezer...
As long as it's powered? So if the controller is powered it's good, if it looses power and for some reason (network is down as an example) it's going to sit there and do nothing?
Just a small needle to request a future enhancement....
Amazing product, love the sonoff integration, we can watch...