It's true, seems a little bit difficult find out something on Jeelabs.
BTW, the search is going on.
Meanwhile, could the code posted by Sparkfun work as well?
Take in consideration I've the RFM22B-S1, but I think there are no differences with the S2 version.
It's a little bit more complicated than having a library ready to use on arduino, but in case I could start reading some stuff.
Sorry for my top-posting, but I'm really stuck with this project
Maybe it's to complicated to start with. Looking on the example code posted above, seems an C code example not really usable for Arduino software (loop function missed) and overall even if I try i obtain the following error:
error: expected primary-expression before '.' token
on line
"static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, _FDEV_SETUP_WRITE);"