Sources:
Android App: https://github.com/OpenDevice/opendevice-examples/tree/master/opendevice-rfid-lock
Arduino (and compatibles) : https://github.com/OpenDevice/opendevice-lib-arduino/tree/master/examples/Projects/AcessControl
=== Features
* Online Authentication
* Offline Authentication
* EEPROM Storage
* Visual and Sounds feedback
* WiFi connection (tested on ESP8266)
...