DR RF12
From Wiki for Dragino Project
Introduction
The DR_RF12 library is designed to send/receive data between avr and rfm12b wireless module. It is originated from Jeelabs rf12 driver with extra software SPI support.
DR_RF12 is Arduino IDE compatible. See this link for how to install DR_RF12 in Arduino.
Examples
PingPong test between mrfm12b and nar12
Reference
More examples and documents please refer rf12 driver