Hi Sebas
I have currently in use two gateways, both Kerlink, 1) ifemtocell 2) iBTS.
I don´t have experience with RAK, but can help with my experience on Kerlink.
You need to configure the SPF (Semtech Packet Forwarding), configure address for network server, select the apropiated network server for AU915 (meshed-router) and use the adecuate console for such router, that is not the standard console (I learned about this detail today, until today I was using a combination of two routers and the standard console, but last week that stopped working)
PLease check this post Meshed-handler - #10 by Samhain
in detail.
Do you have configured (added) the gateway? See some activity ? Some packet received?
Do you know how to check log files from the gateway? to debug, is very important to check log files, in kerlink, there are log files in the embedeed linux that show all activities…
Tell me know more about your advances and problems.
Hugo