Linux/OpenWRT WiFi tip: hostapd, hostapd_cli, and CTRL_IFACE monitor[0]: 111 - Connection refused 

To save yourself some troubleshooting with via , , and in mode…

If you run hostapd_cli -a /path/to/some/ &, then later send a kill -SIGTERM to that process, hostapd will begin complaining, like so:

hostapd: wlan1: AP-STA-DISCONNECTED 00:11:22:33:44:55
hostapd: CTRL_IFACE monitor[0]: 111 - Connection refused
hostapd: wlan1: STA 00:11:22:33:44:55 IEEE 802.11: disassociated

Do not panic.

Yes, hostapd will complain for a while, but it'll eventually automatically clean up monitor connections and stop complaining after some sort of timeout (5-10 minutes, or a few hours?).

It'd be nice if hostapd_cli would properly cleanup on SIGTERM, but it's not the end of the world, don't waste five hours trying to write a Bash wrapper around the interactive mode. Just let the warnings disappear.

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