Playing around I was digging around on my AX88 as I recently turned off 11b at the router but that didn't carry over to the nodes (with wl0_rateset=default/ofdm where ofdm removes 11b)
Found wl0_hapd.conf and wl1_hapd.conf after using htop to monitor running processes... Wondering if its as easy as changing hw_mode=b to for 802.11b in the config, and setting wl0_rateset=default in NVRAM?
/tmp# cat wl0_hapd.conf
## General configurations
driver=nl80211
ctrl_interface_group=0
## Interface configurations
interface=eth6
hw_mode=g (would it be as easy as changing this to b along with wl0_rateset=default in NVRAM? to force only 802.11b rates?)
channel=6
country_code=US
ieee80211d=1
ieee80211h=1
beacon_int=50
bridge=br0
dtim_period=1
ctrl_interface=/var/run/hostapd
ssid=############
auth_algs=1
ap_isolate=0
ignore_broadcast_ssid=0
wpa=2
wpa_key_mgmt=WPA-PSK SAE
wpa_pairwise=CCMP
wpa_group_rekey=604800
wpa_ptk_rekey=0
wpa_passphrase=###############
sae_require_mfp=1
sae_anti_clogging_threshold=5
sae_sync=5
sae_groups=19 20 21
ieee80211w=1
disable_dgaf=0
hs20_deauth_req_timeout=0
osen=0
wmm_enabled=1
Attached is the 5Ghz wl1_hapd.conf that has a section for the guest network I have, in case you want to set up your IOT devices that way. Just noticed that in the GUI under General, wpa_group_rekey=604800 matches what I have there, but for the 5Ghz its wpa_group_rekey=3600? Files names different on the AX86 mesh nodes but the rekey values match the router and also are different between to 2.4 and 5Ghz... SSID's and WPA Passphrase redacted...