@Jaroslaw: the firmware already checks if WiFi is dropped and attempts to reconnect:
https://github.com/OpenSprinkler/OpenSprinkler-Firmware/blob/master/main.cpp#L562
Problems with WiFi may be more elusive than you think. The difficulty is that at internal testing, we’ve never observed WiFi dropping issues. We have 3 different test routers and none of them has any dropped WiFi issue. We’ve also testing unplugging and replugging WiFi router to simulate a WiFi drop, and the controller works fine after the router came back online. We suspect the WiFi issues some users experienced are during to their specific router or WiFi environment — there can be interference, the router may kick devices out for no obvious reason. In any case, if we were able to reproduce the issue we would obviously have introduced solutions to it. The fact is that during testing we couldn’t reproduce the issue so we don’t know what’s causing the wifi dropping issue.