WS-AP3825i AP Setup

Packages needed (pre-install ahead if possible)
relayd
luci-proto-relay

Assumptions:
192.168.70.1/24 on network being joined (WWAN) and extended
192.168.1.1/24 on LAN network for AP - NOTE if the WWAN network is to be on this subnet, this needs to be changed in the interfaces

Reference:
https://openwrt.org/docs/guide-user/network/wifi/wifiextenders/bridgedap#method_2configuration_via_luci

For WS-AP3825i
   LAN2 Port = LAN
   LAN1 Port = WAN

Steps to set up for AP mode:
Disable DHCP on br-lan (click ignore interface)
Disable DHCP RA-Service and DHCPv6-Service (under IPV6 settings)
Join the new network
  -It'll be called WWAN by default
  -Select LAN firewall zone, remove WWAN firewall zone
  -Select lock to BSSID if desired to stay locked to the AP
Delete WAN and WAN6 interfaces
Delete WAN zone under firewall settings
Add static IP to WWAN (ex. 192.168.70.1)
In Interfaces update WWAN to static (click change protocol) and populate IP, subnet mask, gateway, and DNS server (advanced tab)
Reboot
Install RelayD and luci-proto-relay (should already be installed)
Reboot
Add interface repeater_bridge
  - Use protocol Relay Bridge
  - Enter WWAN interface IP (192.168.70.1)
  - Select both LAN and WWAN in "Relay Between Networks"
Reboot
Set up wifi extender network (can be identical to the joined network for seamless roaming)
  - Mode: Master
  - Network: LAN
  - SSID and password (WPA2-PSK / WPA3-SAE recommended)