Edit: Found this in the forums. Is it still relevant or did 1.6.15/16 solve the issue? https://forum.mysensors.org/topic/4680/mysensors-2-0-ethernet-gateway-atmega-w5100-restart-all-time/3 I've setup the UNO with the default sketch and made the changes to make it a separate gateway. I'm seeing the following on repeat. I've tried a few changes here or there to no success. Serial output shows: IP: 192.168.4.35 0;255;3;0;9;Attempting MQTT connection... 0;255;3;0;9;MQTT connected 0;255;3;0;9;Sending message on topic: mysensors-outb/0/255/0/0/18 0;255;3;0;9;Message arrived on topic: mysensors-inb/3/255/3/0/6 0;255;3;0;9;!TSF:MSG:SEND,0-0-3-3,s=255,c=3,t=6,pt=0,l=1,sg=0,ft=0,st=NACK:I 0;255;3;0;9;MCO:BGN:INIT GW,CP=RNNGA--,VER=2.1.0 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 Mosquitto log shows: 1483156702: New connection from 192.168.4.35 on port 1883. 1483156702: New client connected from 192.168.4.35 as mygateway2 (c1, k15, u'pi'). 1483156717: Socket error on client mygateway2, disconnecting. Any ideas?