http://hackaday.com/2015/03/18/how-to-directly-program-an-inexpensive-esp8266-wifi-module/
http://www.instructables.com/id/Getting-Started-with-the-ESP8266-ESP-12/
http://www.danielcasner.org/guidelines-for-writing-code-for-the-esp8266/
https://www.baldengineer.com/four-esp8266-gotchas.html
http://tuanpm.net/rock-solid-esp8266-wifi-mqtt-restful-client-for-arduino/
http://tuanpm.net/native-mqtt-client-library-for-esp8266/
http://www.penninkhof.com/2015/03/esp8266-open-sdk/