I am trying to run hw_mode=a and with channel=0 but hostapd gives me an error on start.
#sudo hostapd /var/run/hostapd/wlan4.cfg
hostapd: /usr/lib/aarch64-linux-gnu/libssl.so.1.0.0: no version information available (required by hostapd)
hostapd: /usr/lib/aarch64-linux-gnu/libssl.so.1.0.0: no version information available (required by hostapd)
hostapd: /usr/lib/aarch64-linux-gnu/libcrypto.so.1.0.0: no version information available (required by hostapd)
Configuration file: /var/run/hostapd/wlan4.cfg
wlan4: interface state UNINITIALIZED->COUNTRY_UPDATE
ACS: Automatic channel selection started, this may take a bit
wlan4: interface state COUNTRY_UPDATE->ACS
wlan4: ACS-STARTED
ACS: Unable to collect survey data
ACS: All study options have failed
Interface initialization failed
wlan4: interface state ACS->DISABLED
wlan4: AP-DISABLED
ACS: Possibly channel configuration is invalid, please report this along with your config file.
ACS: Failed to start
wlan4: AP-DISABLED
hostapd_free_hapd_data: Interface wlan4 wasn’t started
wlan4: interface state DISABLED->DISABLED
hostapd_free_hapd_data: Interface wlan4 wasn’t started
Hostapd Config File
Hostapd configuration for wlan4
interface=wlan4
driver=nl80211
logger_syslog=-1
logger_syslog_level=0
logger_stdout=-1
logger_stdout_level=4
country_code=US
ieee80211d=1
ssid=testfloor1
channel=0
hw_mode=a
ieee80211w=0
macaddr_acl=0
max_num_sta=5
ap_isolate=1
auth_algs=1
tx_queue_data3_aifs=7
tx_queue_data3_cwmin=15
tx_queue_data3_cwmax=1023
tx_queue_data3_burst=0
tx_queue_data2_aifs=3
tx_queue_data2_cwmin=15
tx_queue_data2_cwmax=63
tx_queue_data2_burst=0
tx_queue_data1_aifs=1
tx_queue_data1_cwmin=7
tx_queue_data1_cwmax=15
tx_queue_data1_burst=3.0
tx_queue_data0_aifs=1
tx_queue_data0_cwmin=3
tx_queue_data0_cwmax=7
tx_queue_data0_burst=1.5
wmm_ac_bk_cwmin=4
wmm_ac_bk_cwmax=10
wmm_ac_bk_aifs=7
wmm_ac_bk_txop_limit=0
wmm_ac_bk_acm=0
wmm_ac_be_aifs=3
wmm_ac_be_cwmin=4
wmm_ac_be_cwmax=10
wmm_ac_be_txop_limit=0
wmm_ac_be_acm=0
wmm_ac_vi_aifs=2
wmm_ac_vi_cwmin=3
wmm_ac_vi_cwmax=4
wmm_ac_vi_txop_limit=94
wmm_ac_vi_acm=0
wmm_ac_vo_aifs=2
wmm_ac_vo_cwmin=2
wmm_ac_vo_cwmax=3
wmm_ac_vo_txop_limit=47
wmm_ac_vo_acm=0