To ensure a bit more security (You know the joke that 's' in IoT stands for security) I decided it will be better if I split the network into few physical networks.
A second router (working as a Layer3 switch) handles both the WiFi and ethernet networks for the Home Automation
With the current setup we get some extra redundancy, in case the Home Automation router/switch goes down,
all WiFi Home Automation devices have the primery WiFi as they failback wireless network.
The DHCPD on both routers had static entries for all the HomeAutoamtion device.
And the server running Domoticz (that is the MQTT server too) has IP from the same network segment the aforementioned devices.
0x01 Network diagram
0x02 Configuration details