But as far as I know, UDP broadcast is just a matter of sending to a 'global' node address of 255, which allows all listening subnet nodes to receive that message if they have the appropriate UDP listening port open.
So I think it is basically just a matter of all Basic listening nodes being able to have the same UDP listening port nnnn open, and any Basic node that needs to transmit simply sends its outgoing UDP message to port nnnn at the global broadcast address of 255. (ie: 192.168.1.255) which all other listening nodes should receive.
If so, it means that all DHCP nodes could have an identical 'listening' network configuration (port=nnnn), and any nodes needing to transmit also have a common 'sending' configuration (nnn.nnn.nnn.255).
Therefore all DHCP nodes would be capable of communicating with each other using identical UDP network settings which don't need any unique per-node IP tailoring.
So if I've understood things correctly ? that could offer a very simple and non-technical way for users to be able to link interactive ESP Basic nodes together.