WIFIO is a dual Arduino WIFI module (ESP8266+ATMEGA328P) FCC approve-able with transferable licence. Can use the 328P for I/O expansion also...

Moderator: igrr

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By schufti
#84119 this may be an error in the arduino esp8266 core:
a)
try reinstalling the board package
if that fails, search for issue on github
if not existing open a new issue

b) try github version

c) step back to 2.4.x version as the > 2.5.x seem all very "experimental"