[FS#3159] 802.11r default settings are inappropriate, need to change two default settings

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FS#3159 -  802.11r default settings are inappropriate, need to change two default settings
User who did this - Fabio Scaccabarozzi (fsvm88)

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Adding to this, as I spent the last 2 days debugging why my phone was *not* doing "fast" (B->A AP transitions (WPA-PSK): some clients do *not* disassociate/deauth from the old station *even after* associating to the new one (my OnePlus 5 Android 10.0 phone seems to do this).
My understanding was that at least in FT-over-DS via communication to the old AP, this case should have been covered by hostapd, but it's not.
Going A->B works perfectly, but since the client is never deauth/disassociated from A after the transition, going back to A before max_inactivity kicks in on AP A means the client will not reassociate to A, because A expects the old key and Client uses a new one I suppose (and it's still registered in the kernel, you can observe the infamous "Could not set STA to kernel driver" error until the client decides to re-do the entire handshake properly).
Lowering max_inactivity to 15 seconds allowed me to mostly work around this issue.
My guess it that this case is better-handled in WPA-EAP deployments, where one controller is in charge of the keys and does push/pull to the APs.
max_inactivity of 300 should work well for most users - not that I'm walking in and out of my house rooms every other minute myself - but I guess improving the documentation would save many more users a lot of time (esp. for the WPA-PSK usecase).

My final config:

config wifi-device 'radio0'
    option beacon_int '80'
    option channel '60'
    option country 'XX'
    option htmode 'VHT80'
    option hwmode '11a'
    option legacy_rates '0'
    option macaddr 'FF:FF:FF:FF:3c:56'
    option txpower '17'
    option type 'mac80211'

config wifi-iface 'wlan0'
    option bss_transition '1'
    option device 'radio0'
    option doth '1'
    option encryption 'psk2+ccmp'
    option ft_over_ds '0'
    option ft_psk_generate_local '1'
    option ieee80211r '1'
    option ieee80211v '1'
    option ieee80211w '1'
    option key ''
    option max_inactivity '15'
    option mode 'ap'
    option nasid '1111'
    option network 'lan'
    option pmk_r1_push '1'
    option reassociation_deadline '20000'
    option ssid 'net-5g'
    option wnm_sleep_mode '1'

config wifi-device 'radio1'
    option beacon_int '80'
    option channel '3'
    option country 'XX'
    option htmode 'HT20'
    option hwmode '11g'
    option legacy_rates '0'
    option macaddr 'FF:FF:FF:FF:84:eb'
    option txpower '17'
    option type 'mac80211'

config wifi-iface 'wlan1'
    option bss_transition '1'
    option device 'radio1'
    option doth '1'
    option encryption 'psk2+ccmp'
    option ft_over_ds '0'
    option ft_psk_generate_local '1'
    option ieee80211r '1'
    option ieee80211v '1'
    option ieee80211w '1'
    option key ''
    option max_inactivity '15'
    option mode 'ap'
    option nasid '1111'
    option network 'lan'
    option pmk_r1_push '1'
    option reassociation_deadline '20000'
    option ssid 'net'
    option wnm_sleep_mode '1'



Of course, nasid is '2222' for AP #2.

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3159#comment9108

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