Ok, i think the gateway is working.
The node showed up here: http://thethingsnetwork.org/api/v0/nodes/
the gateway EUI is: 0080000000009D69
Not sure if everything is set up correctly though, as i can’t find it on the /gateway page.
Also, the Uno is sending the first packet ok, but the next buttonpress results in a “busy” message from the serial monitor window.