I have just released the ESP8266 Simple-Pair library for Arduino.
Used for checking hand between ESP8266s to exchange some data
before WiFi connection, such as SSID, PASSWORD or ESP-NOW KEY ..etc.
And can use these data to connect WiFi after.
https://github.com/TridentTD/TridentTD_ ... es/tag/1.0
This library is developed from ESP8266 SDK Simple-Pair
http://espressif.com/en/content/simple-pair-user-guide
Thank you.