Setting up a wireless AP switch

Installing and Using OpenWrt Network and Wireless Configuration
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I don't use relayd, so I cannot guide you through any of the specifics.

That said, I mentioned that it has known issues. Specifically:

  1. DHCP issue caused by Access Point. OWrt forum

You would probably be best served by resetting your device to defaults and exactly following the relayd guide.

But, in the end, the preferred solutions are:

  • Use ethernet (wire) instead of wireless. This is always easier and higher performance, and just works.
  • Make sure your main router (or your main AP) is using OpenWrt so that you can setup wds or 802.11s mesh.