Quick Reference

1. esp-open-sdk: Free and open (as much as possible) integrated SDK for ESP8266/ESP8285 chips
2. dtec/esp8266: ESP8266 SDK Build Toolchain Docker Image

Using Toolchain

From project source path

$ sudo docker run --name esp8266 -it --rm -v $PWD:/src/project esp8266:1.22-p
$ make all