[HELP] any way to block a certain node from connecting on a mesh network?

Still having issues with openwrt batman-adv with more than 1 main mesh connected to the backbone network.
If a node sees 2 mesh nodes with wired connection to the backbone it has connection issues. Easy fix is to change the channel on the other wired mesh.

I could use STP but blocking nodes is better so i can control the connection topology.