Do the Ethernet modules listed in the Store work???
These modules do not have a SS pin, but rather NSS. Per this topic http://forum.mysensors.org/topic/466/ethernet-gateway-problem/37, these modules may not work. "Checked the board but I see no invertor IC on it so I think NSS is connected to /SCS pin (pin 29). Too bad. I think the shopping list should be updated to a board that has SPI_EN pin (pin 31) connected."