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I'm trying to use hostapd in version 2.5 with ACS. In order to do that, I have used the following config file:

interface=wlp2s0 driver=nl80211 ssid=ap-example hw_mode=g channel=acs_survey macaddr_acl=0 ignore_broadcast_ssid=0 auth_algs=1 wpa=3 wpa_passphrase=ap-example wpa_key_mgmt=WPA-PSK wpa_pairwise=TKIP rsn_pairwise=CCMP

I have built hostapd with CONFIG_ACS=y flag but when I try to start service I get the following errors:

$ ./hostapd /etc/hostapd/hostapd.conf Configuration file: /etc/hostapd/hostapd.conf ACS: Automatic channel selection started, this may take a bit wlp2s0: interface state UNINITIALIZED->ACS wlp2s0: ACS-STARTED ACS: Unable to collect survey data ACS: All study options have failed Interface initialization failed wlp2s0: interface state ACS->DISABLED wlp2s0: AP-DISABLED ACS: Possibly channel configuration is invalid, please report this along with your config file. ACS: Failed to start wlp2s0: AP-DISABLED hostapd_free_hapd_data: Interface wlp2s0 wasn't started nl80211: deinit ifname=wlp2s0 disabled_11b_rates=0 wlp2s0: interface state DISABLED->DISABLED wlp2s0: interface state DISABLED->DISABLED wlp2s0: AP-DISABLED hostapd_free_hapd_data: Interface wlp2s0 wasn't started

Of course, I'm running this with root privileges. I have seen in defconfig file in hostapd package that only some drivers are supported to do Automatic Channel Subscription.

Anyone have idea about what happening with my config? Exists any relation of supported drivers in hostapd project wiki or something like that?

Juan Garcia
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  • I've had many issues with ACS as well, and I wouldn't consider that feature to be ready for production yet. You should contact hostapd's developers and report the bug to them (along with the hardware you're using and a log of hostapd running in verbose mode). – André Borie Apr 19 '16 at 13:07

1 Answers1

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After a few hours of fiddling, I gave up on trying to get hostapd's ACS option working on my RPi4 and instead wrote a short script (requires NodeJS) to call iwlist wlan0 scan, parse the output, and pick the quietest channel in the range 1-11. In case it's helpful, I posted a gist of it here: https://gist.github.com/jacobq/ea044bfbf00dd88ed6e3d42cb1fee392

jacobq
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