TCP/IP stack in ESP8266 is a heavily modified development branch between
1.4.0 and 1.4.1 stable versions.
The non-OS usage of this little beast requires releasing cpu quite
frequently for wifi duties, so they require using os_ versions of the
standard C library functions. Don't know how friendly the FreeRTOS SDK
is, nor if it is stable, last time I checked it was a beta.
There is someone in the net who tracked changes and released a modified
pre 2.0.0. stack.
Having been digging into some of their example code, I do not recommend
this piece of engineering for production use in communications devices.
It may work OK for connect/do your work/disconnect stuff in devices with
some communications capabilities.
Your mileage will vary.
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