Improve the WiFi access speed.

tuning the hostapd.conf to make it from 8Mbps to 60Mbps in my case.

check WiFi interface capability

iw list to get the capability, my USB WiFi results::

$ iw list
...
     Band 1:
         Capabilities: 0x1962
             HT20/HT40
             Static SM Power Save
             RX HT20 SGI
             RX HT40 SGI
             RX STBC 1-stream
             Max AMSDU length: 7935 bytes
             DSSS/CCK HT40
...
     Band 2:
         Capabilities: 0x862
             HT20/HT40
             Static SM Power Save
             RX HT20 SGI
             RX HT40 SGI
             No RX STBC
             Max AMSDU length: 7935 bytes
             No DSSS/CCK HT40
...
         VHT Capabilities (0x03c031a2):
             Max MPDU length: 11454
             Supported Channel Width: neither 160 nor 80+80
             short GI (80 MHz)
             TX STBC
             SU Beamformee
             +HTC-VHT

modify the hostapd.conf

enable enhanced capabilities by ht_capab or vht_capab in hostapd.conf, almost items disabled by defaults.

I can't find the ht_capab options manual, so cut and try will be needed.

```text# interface=wlan0 interface=wlan0 bridge=br0 driver=nl80211

ctrl_interface=/var/run/hostapd ctrl_interface_group=0

ssid=samplesample macaddr_acl=0

country_code=JP ieee80211d=1

hw_mode=a channel=36

auth_algs=1 wpa=2 wpa_psk=1234567890abcdef1234567890abcdef1234567890123456789abcdef1234567 wpa_key_mgmt=WPA-PSK wpa_pairwise=CCMP

wmm_enabled=1 ieee80211w=0 ieee80211ac=1 ieee80211n=1

ht_capab=[HT20-][HT40+][SHORT-GI-20][SHORT-GI-40][DSSS_CCK-40][MAX-AMSDU-7935] vht_capab=[SHORT-GI-80][TX-STBC-1][+HTC-VHT][MAX-AMSDU-11454] ```

improve for 2.4GHz access point ... failed

I can't get the faster WiFi speed for hw_mode=g as 2.4GHz settings.

ht_capab makes few effects to WiFi speed.