It would be nice to have some minimal but complete working apps/examples for newbies which they can use as a starting point for learning. By minimal I mean just complex enough to learn one concept.
switch 1 gpio-pin on and off on the main raspberry
read out the value of 1 gpio-pin on the main raspberry
switch 1 gpio-pin on and off on a satellite
read out the value of 1 gpio-pin on a satellite raspberry