@Yveaux
In Ethernet gateway mode, resetting sensor nodes didin't help.
Not sure it's Domoticz, because the same Pi with the same radio plugged into an Arduino in serial gateway mode produces lines like below for all sensor nodes, without even resetting anything:
cat /dev/ttyUSB0
0;255;3;0;9;241037 TSF:MSG:READ,20-20-0,s=7,c=1,t=0,pt=7,l=5,sg=0:24.4
20;7;1;0;0;24.4
0;255;3;0;9;241135 TSF:MSG:READ,20-20-0,s=8,c=1,t=1,pt=7,l=5,sg=0:46.1
20;8;1;0;1;46.1
0;255;3;0;9;241229 TSF:MSG:READ,20-20-0,s=255,c=3,t=0,pt=1,l=1,sg=0:93
0;255;3;0;9;241236 TSF:MSG:ACK REQ