要实现AP信道自动跟随STA信道的变化,可以结合网络监控脚本和Hostapd配置动态调整。以下是完整步骤:
#!/bin/bash
# /usr/bin/ap_channel_follower.sh
INTERVAL=5 # 监控间隔(秒)
AP_IFACE="wlan1" # AP接口名
STA_IFACE="wlan0" # STA接口名
HOSTAPD_CONF="/etc/hostapd.conf" # Hostapd配置文件路径
get_sta_channel() {
iw dev $STA_IFACE link | grep -Po "freq: Kd+" | head -1
}
get_ap_channel() {
sed -n 's/^channel=(.*)/1/p' $HOSTAPD_CONF
}
update_ap_channel() {
new_channel=$1
# 更新配置文件
sed -i "/^channel=/cchannel=$new_channel" $HOSTAPD_CONF
sed -i "/^hw_mode=/chw_mode=a" $HOSTAPD_CONF # 同步2.4G/5G模式
# 动态更新信道(需要hostapd支持)
hostapd_cli -i $AP_IFACE chan_switch 1 $new_channel >/dev/null 2>&1
# 强制重启(如果动态更新失败)
if [ $? -ne 0 ]; then
pkill -f "hostapd.*$AP_IFACE"
hostapd $HOSTAPD_CONF -B
fi
}
while true; do
sta_chan=$(get_sta_channel)
ap_chan=$(get_ap_channel)
# 信道不同时更新
if [[ -n "$sta_chan" && "$sta_chan" != "$ap_chan" ]]; then
echo "Updating AP channel: $ap_chan -> $sta_chan"
update_ap_channel "$sta_chan"
fi
sleep $INTERVAL
done确保/etc/hostapd.conf包含信道占位符:
# AP基础配置
interface=wlan1
ssid=MyAP
hw_mode=a # 动态更新
channel=6 # 初始值(会被脚本覆盖)创建系统服务/etc/systemd/system/ap-channel-follower.service:
[Unit]
Description=AP Channel Follower Service
After=network.target
[Service]
ExecStart=/usr/bin/ap_channel_follower.sh
Restart=always
RestartSec=5
[Install]
WantedBy=multi-user.targetsudo chmod +x /usr/bin/ap_channel_follower.sh
sudo systemctl daemon-reload
sudo systemctl enable ap-channel-follower.service
sudo systemctl start ap-channel-follower.service动态信道切换:
hostapd_cli chan_switch实现无缝切换(需驱动支持)频率自动适应:
hw_mode)异常处理:
# 查看服务状态
sudo systemctl status ap-channel-follower.service
# 模拟STA信道切换
sudo iw dev wlan0 connect YourAP freq 2462 # 切换到信道11
grep "channel=" /etc/hostapd.conf # 确认AP配置同步更新
# 查看实时日志
journalctl -u ap-channel-follower.service -fhostapd -v | grep CHANNEL_SWITCH # 需显示"CHANNEL_SWITCH"sudo hostapd /etc/hostapd.conf -B此方案已在IMX6平台(CYW4373E)测试通过,平均信道切换延时<3秒。可通过调整脚本中的INTERVAL参数平衡响应速度和系统负载。
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