@RWB good news I was able to get working the RFm96 with particle photon using ATOM(dev ide??) , is very simple the only need is to create a project folder with 2 folders one for the applications and second named “src” containing all radiohead library files *.h and *.cpp , the trick is to copy from radiohead library 2 files named atomic.h and atomic.cpp and put those files inside src folder, then yo need to edit the file radiohead.h go to line 859 and 861 and edit the location of the atomic.h
#include atomic.h
regards