Hi jfeger, sorry I can't find the sketches anymore... if I end-up finding it I post here. So, I decided to use bare Arduino with the RadioHead RFM69 lib and parts of the Talk2 library. I just didn't feel the need for the whole framework and doing this I was able to customize a bit more the low-power usage and easily integrate with other third-party libraries which weren't playing nice together with MySensor. In terms of messages, protocol I just follow the Talk2 example and I'm using their "Message" format. I just assigned the "id" to a kind of message by convention and use the 8 bytes payload for the data... I normally use only 1 to 4 bytes actually.