it would be interesting to see what sleep function does, may be need to read library code to understand this in more detailed.

@yakcrac try the download link in the top menu

@anticimex You are too fast Now the CERN files are uploaded!!

Just one final question... is the approach to MQTT correct or should I stick with simple Ethernet? I was planning on using OpenHab or Home Assistant. Thank You all

i think i finally get it. It is impossible... well the only way to let nodes communicate with each other is when a gateway is available (directly or trough other nodes) when the node is starting up. This forum discussion is explaining me the most.. a solution may be.. transform the node that is always on to an gateway. And use antoher channel.. Sidenode; then you can't tell the controller what the status is. Is there realy no way that this can supported? Node to node comunication without the need of an gateway inside the network? Skipping the registration and just send the message around. perhaps i will dive into the source one day and change the registration behavior. Thanks anyway for the help and the very fast responding.

@doug Can't wait for you to release the BOM

@DavidZH - I really hate our electrical system here, but that is coming from an electronics guy, not a electrician. I like the idea of low voltage in the switches, however its AC. I would prefer to see DC, but the voltage drops might be something that they're attempting to avoid by sending AC instead. Yes, i agree about those damn rings and we also don't have the room here in the UK like you mentioned about the NL.