I’m planning on adding ESP-NOW sync support in parallel with the existing UDP sync. ESP-NOW is a connectionless WiFi protocol that can work over longer distances than normal WiFi as there’s no connection to maintain. It’s point to point, but it would be easy to have receivers repeat the sync message to extend the range. More here: Masive show - #18 by embedded-creations
This would be one-way communication only, so maybe not what you’re looking for.