去掉wpad-mini，换成wpad

config wifi-iface 'default_radio0'
        option device 'radio0'
        option network 'lan'
        option mode 'ap'
        option ssid 'OpenWrt'
        option encryption 'none'
        option ieee80211k '1'
        option ieee80211v '1'
        option wnm_sleep_mode '1'
        option bss_transition '1'
        option rrm_neighbor_report '1'
        option rrm_beacon_report '1'
        option time_advertisement '2'
        option time_zone 'UTC8'