Well I wouldn’t call it *porting* OSPi to ESP8266, I think it’s just making OpenSprinkler firmware work on ESP8266. Since ESP8266 is now supported by Arduino, it wouldn’t take too much work to adapt the firmware to compile for ESP8266. The main challenge is that ESP8266 has a much smaller set of pins (especially analog pin, which it has only one!) This will involve using I/O expander chip and ADC chip in order to adapt all OpenSprinkler functionalities to ESP8266.