Adding OpenWrt support for Xiaomi AX3600 (Part 1)

[joba-1]

I have opened this topic about a roaming issue I have: moving clients hang with no apparent reason when roaming.
Maybe it is not a config issue but a "not implemented in this firmware" yet issue?

Roaming Issues Xiaomi AX3600

Hi, I have two "dumb" openwrt APs (Xiaomi AX3600) connected with a LAN. No WAN, VLAN or firewall. Both APs have one ath10k (only 2.4 GHz used) and one ath11k (2.4 and 5 GHz used). While ultimately I want to roam between ath11k 2.4 and 5 GHz with one SSID, currently they are two separate SSIDs. All are in the same IP4 subnet (for now IPV6 is disabled as far as I could do that). One AP is the DHCP- and DNS-server of the LAN. When I move a device from one AP to the other, it usually takes a ve…