I modified MyConfig.h file and RFM69 driver to allow you build gateway (ethernet or MQTT) with W5100 ethernet and RFM69 radio modules using SoftSPI bus. You can find it at: https://github.com/gieemek/RFM69_softSPI-for-MySensors-2.1.1

I tried the SoftSPI without success !! As I am MySensors newbie I decided to get more experience on setting my network (Some nodes with serial gateway connected to Jeedom using the current branch) and then I will come back with the dev branch. I am not to far as the serial gateway is working fine with RFM69 and nodes are working with Arduino bootloader. @hek: I think I tried everithing (3 differrent lib for softspi or hard spi) but the debug mode need to be improved to understand where is the problem. It's just what I think, I could be wrong ;)