I don't know this url already has been mentioned but here you find some interesting LoRa projects, heads off for this guy 
Take a look in his dropbox, especially the LoRa_for_Arduino, and Arduino RFM98 LoRa Shield folder. Although 434mhz I guess it may be possible to convert into 868mhz
http://www.rcgroups.com/forums/showthread.php?t=2341299
Kind regards,