Given that channel equals 36 in conf. , how to establish WiFi 5G connection before start of AP mode on FWA-1112VC/1012VC

Purpose

This guide is to provide a simple step-by-step guidance for users to follow on how to establish WiFi 5G connection given that channel equals 36 in 5G config.

Description

After user edit hostpd_5G_ac_ch44.cfg for dual WLAN interface based on our user manual about AP Application, user still encounter error response to the command to establish WiFi connection.  

root@FWA-1112VC:~/library/configs# hostapd hostapd_5G_n.cfg
Configuration file: hostapd_5G_n.cfg
nl80211: Could not configure driver mode
nl80211: deinit ifname=wlan1 disabled_11b_rates=0
nl80211 driver initialization failed.
wlan1: interface state UNINITIALIZED->DISABLED
wlan1: AP-DISABLED
hostapd_free_hapd_data: Interface wlan1 wasn't started

Method

User could remark channel=36 or assign the value a to channel, which means channel=a.

interface=wlan1
#bridge=br0
driver=nl80211

ssid=AP-5g_802.11ac
hw_mode=a
#channel=36
ieee80211n=1
wmm_enabled=1
#country_code=TW
#ieee80211d=1
ht_capab=[HT40+][SHORT-GI-20][SHORT-GI-40]