Gateway receives Brocast, but Node fails to find parent

[The Grue]

Hello,

I'm trying to build my first MySensors Gateway and Node. I assembled an WizNET (W5100) Ethernet Gateway with NRF24L01+PA+LNA radio module. To get a good power source, I'm using an LM317.
The Node is an Air Humidity sensor: https://www.mysensors.org/build/humidity

Unfortunatly, I'm not able to get it working. I'm using FHEMs MySensor Module to set the gateway to inclusion mode. FHEM connects to the gateway fine, but I'm not sure if inclusion is working.

After start, that's what's happening on the gateway:

0;255;3;0;9;MCO:BGN:INIT GW,CP=RNNGA--,VER=2.1.1
0;255;3;0;9;TSM:INIT
0;255;3;0;9;TSF:WUR:MS=0
0;255;3;0;9;TSM:INIT:TSP OK
0;255;3;0;9;TSM:INIT:GW MODE
0;255;3;0;9;TSM:READY:ID=0,PAR=0,DIS=0
0;255;3;0;9;MCO:REG:NOT NEEDED
IP: 192.168.178.3
0;255;3;0;9;MCO:BGN:STP
0;255;3;0;9;MCO:BGN:INIT OK,TSP=1
0;255;3;0;9;TSF:MSG:READ,255-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0:
0;255;3;0;9;TSF:MSG:BC
0;255;3;0;9;TSF:MSG:FPAR REQ,ID=255
0;255;3;0;9;TSF:CKU:OK,FCTRL
0;255;3;0;9;TSF:MSG:GWL OK
0;255;3;0;9;TSF:MSG:SEND,0-0-255-255,s=255,c=3,t=8,pt=1,l=1,sg=0,ft=0,st=OK:0
0;255;3;0;9;TSF:MSG:READ,255-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0:
0;255;3;0;9;TSF:MSG:BC
0;255;3;0;9;TSF:MSG:FPAR REQ,ID=255
0;255;3;0;9;TSF:CKU:OK,FCTRL
0;255;3;0;9;TSF:MSG:GWL OK
0;255;3;0;9;TSF:MSG:SEND,0-0-255-255,s=255,c=3,t=8,pt=1,l=1,sg=0,ft=0,st=OK:0
0;255;3;0;9;TSF:MSG:READ,255-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0:
0;255;3;0;9;TSF:MSG:BC

If I understand correctly, the gateway is already receiving a broadcast - which can only come from the Node...? However, at the same time the Node tells me:

0 MCO:BGN:INIT NODE,CP=RNNNA--,VER=2.1.1
3 TSM:INIT
4 TSF:WUR:MS=0
11 TSM:INIT:TSP OK
13 TSM:FPAR
15 TSF:MSG:SEND,255-255-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
2022 !TSM:FPAR:NO REPLY
2024 TSM:FPAR
2026 TSF:MSG:SEND,255-255-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
4034 !TSM:FPAR:NO REPLY
4036 TSM:FPAR
4038 TSF:MSG:SEND,255-255-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
6046 !TSM:FPAR:NO REPLY
6048 TSM:FPAR
6050 TSF:MSG:SEND,255-255-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
8058 !TSM:FPAR:FAIL
8059 TSM:FAIL:CNT=1
8061 TSM:FAIL:PDT
18065 TSM:FAIL:RE-INIT

So the node doesn't find it's parent. Maybe because it's not in inclusion mode? I have no Idea, to be honest and hope you can help me...

Have a nice Sunday evening,
Markus