@martinhjelmare Isn't that fourth message a presentation message?

I think that I actually had two problems:

First, I was erroneously requesting information from the controller in my setup() function, before presentation(). I mixed old and new sample code without knowing what I was doing. This is now fixed.

Second, my nodes were not reporting any initial state, so HA was not showing them in the GUI. This sounds like reasonable behaviour, so why do no actuator node sketches report EEPROM-saved state on presentation? I have just hacked a sketch to do this, and the node shows in HA correctly. But messages fail to send from inside presentation(), so I have to watch for a flag in my loop(). Why is this?

void loop()
{
  if(needreport)
  {
    needreport = false;
    report();
  }
}

I plugged in the gateway and reset one of the (S_COVER) nodes:

0;255;3;0;14;Gateway startup complete.
0;255;0;0;18;2.0.0
3;10;2;0;3;
3;255;3;0;6;0
3;255;3;0;11;MyServoBlinds
3;255;3;0;12;2
3;10;0;0;5;North

No, the sensors communicate via RF24.

I'm trying to use Home Assistant as a controller for three nodes (two S_COVER, one S_HVAC) via a serial gateway (protocol v2.0). My nodes present to MYSController just fine, but not to HA. Here are the messages from HA when a node is reset. They appear the same on my Windows laptop as on my Fedora machine.

Can anyone help me? I'm really excited to automate these devices!

WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
ERROR:mysensors.mysensors:Node 3 is unknown, will not add child 10.
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
ERROR:mysensors.mysensors:Node 3 is unknown, will not add child 10.
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
ERROR:mysensors.mysensors:Node 3 is unknown, will not add child 10.
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
ERROR:mysensors.mysensors:Node 3 is unknown, will not add child 10.
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
ERROR:mysensors.mysensors:Node 3 is unknown, will not add child 10.
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
ERROR:mysensors.mysensors:Node 3 is unknown, will not add child 10.
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
ERROR:mysensors.mysensors:Node 3 is unknown, will not add child 10.
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
ERROR:mysensors.mysensors:Node 3 is unknown, will not add child 10.
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
ERROR:mysensors.mysensors:Node 3 is unknown, will not add child 10.
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
ERROR:mysensors.mysensors:Node 3 is unknown, will not add child 10.
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
ERROR:mysensors.mysensors:Node 3 is unknown, will not add child 10.
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
ERROR:mysensors.mysensors:Node 3 is unknown, will not add child 10.
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
ERROR:mysensors.mysensors:Node 3 is unknown, will not add child 10.
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Node 3 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
ERROR:mysensors.mysensors:Node 3 is unknown, will not add child 10.
INFO:homeassistant.components.mysensors:No sketch_name: node 3
INFO:homeassistant.components.mysensors:No sketch_name: node 3
INFO:homeassistant.components.mysensors:No sketch_name: node 3
INFO:homeassistant.components.mysensors:No sketch_name: node 3
INFO:homeassistant.components.mysensors:No sketch_name: node 3
INFO:homeassistant.components.mysensors:No sketch_name: node 3
WARNING:mysensors.mysensors:Child 255 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
WARNING:mysensors.mysensors:Child 10 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3
ERROR:netdisco.ssdp:Error fetching description at http://192.168.0.1:8200/rootDesc.xml
WARNING:mysensors.mysensors:Child 10 is unknown
INFO:mysensors.mysensors:Requesting new presentation for node 3