ESP8266 Code for Techspaces RFID Doors
Covers both entry system and the Checkin (aka Chicken) system at tablet.
- ESP8266 Board Types installed - use Board Manager URL http://arduino.esp8266.com/stable/package_esp8266com_index.json and install ESP8266 Generic
- MFRC522 library (from Arduino Library Manager)
- PubSubClient library (from Arduino Library Manager)