Re: [lwip-users] ESP8266 as WiFi to PPP Bridge

[Sergio R. Caprile]

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.