ESP8266 Community Forum

- Wed Jun 07, 2017 3:44 am #66852 Yes

- Wed Jun 07, 2017 3:59 am #66855 There is a file named "version" within the ESP8266 core files in the Arduino IDE install which contains the SDK version. Eg here: portable\packages\esp8266\hardware\esp8266\2.3.0\tools\sdk\version

The 2.3.0 release has SDK version 1.5.3_16_04_18

The 2.4.0-rc1 release has SDk version 2.0.0_16_08_09

And there is a GIT branch "update_sdk_2.1.0" which has the latest 2.1.0 SDK, see here.

- Wed Jun 07, 2017 4:31 pm #66879 Good grief... why does the Non-OS thread switcher matter?

Anyway, it is whatever in the SDK version...
http://esp8266.github.io/Arduino/versions/2.3.0/doc/changes.html

Ray