Restored compatibility with ESP8266 Arduino Core < 3.0.1 #500
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#486 broke compatibility with all ESP8266 Arduino core versions but the most recent 3.0.1 one. Support for the latest version is of course the most important, still more compatibility is nice as long as it doesn't cause extra maintainance.
Version 3.0.1 added the macro
ARDUINO_ESP8266_MAJOR
incores/esp8266/core_version.h
(esp8266/Arduino#8126), so it can be used to distinguish 3.0.1 and future releases that need to includecore_esp8266_i2s.h
from previous versions that need to includei2s.h
.Verified working in Arduino Core 2.7.4, 3.0.0 and 3.0.1.