The zone expansion board only consists of a shift register and eight triacs, and does not have a microcontroller or Ethernet controller in it. So it would not be possible to have the main controller talk to expansion board through wireless. You may be able to connected them wired with a RJ45 Ethernet cable (you will need to figure out the wiring). But this hasn’t been tested over a long distance so you may need to experiment with it to see if this is reliable.