I am glad to hear you’ve figured it out, although I am still puzzled why newer ESP8266 platform would result in such difference. Do you know the esp8266 core version that these newer platforms use? The current OpenSprinkler firmware is compiled with ESP8266 core 2.7.4 (as shown in the Makefile and build instructions). I’ve compiled it with the latest core version 3.0.2 as well but have not fully tested it. I am not sure what core versions platformio uses.