Martin @ harizanov.com has published an article on how to forward traffic from RFM69 to MQTT using ESP8266:
I’ve mentioned my plans for this project during the IoT hangout session few months ago, it has finally materialized as working prototype. The blocker so far was the lack of ESP8266 RFM69 driver and free time on my end, so I’ve teamed up with Andrey Balarev to solve this. Andrey is an IoT enthusiast + embedded systems developer and has done excellent job in porting LowPowerLab’s RFM69 library for the ESP8266.
RFM69 to MQTT gateway using ESP8266 – [Link]