Hi, due to wifi drops investigation I run hostapd with -dd parameter.
Now in log there is a lot of messages like this without anything else:
12:30:39 daemon.debug hostapd: wlan0: STA xx:xx:xx:xx:d7:76 IEEE 802.11: hostapd_public_action - action=0
12:33:44 daemon.debug hostapd: wlan0: STA xx:xx:xx:xx:d7:76 IEEE 802.11: hostapd_public_action - action=0
12:41:30 daemon.debug hostapd: wlan0: STA xx:xx:xx:xx:d7:76 IEEE 802.11: hostapd_public_action - action=0
12:46:09 daemon.debug hostapd: wlan0: STA xx:xx:xx:xx:d7:76 IEEE 802.11: hostapd_public_action - action=0
12:47:43 daemon.debug hostapd: wlan0: STA xx:xx:xx:xx:d7:76 IEEE 802.11: hostapd_public_action - action=0
12:49:15 daemon.debug hostapd: wlan0: STA xx:xx:xx:xx:d7:76 IEEE 802.11: hostapd_public_action - action=0
12:50:47 daemon.debug hostapd: wlan0: STA xx:xx:xx:xx:d7:76 IEEE 802.11: hostapd_public_action - action=0
12:53:54 daemon.debug hostapd: wlan0: STA xx:xx:xx:xx:d7:76 IEEE 802.11: hostapd_public_action - action=0
12:55:27 daemon.debug hostapd: wlan0: STA xx:xx:xx:xx:d7:76 IEEE 802.11: hostapd_public_action - action=0
12:57:00 daemon.debug hostapd: wlan0: STA xx:xx:xx:xx:d7:76 IEEE 802.11: hostapd_public_action - action=0
13:00:06 daemon.debug hostapd: wlan0: STA xx:xx:xx:xx:d7:76 IEEE 802.11: hostapd_public_action - action=0
13:03:12 daemon.debug hostapd: wlan0: STA xx:xx:xx:xx:d7:76 IEEE 802.11: hostapd_public_action - action=0
13:04:45 daemon.debug hostapd: wlan0: STA xx:xx:xx:xx:d7:76 IEEE 802.11: hostapd_public_action - action=0
13:06:18 daemon.debug hostapd: wlan0: STA xx:xx:xx:xx:d7:76 IEEE 802.11: hostapd_public_action - action=0
At client (win7) via netmon I see next packets:
1148 13:04:14 02.06.2020 [xxxxxx xxxxC1] [xxxxxx xxD776] WiFi:[ ControlRTS] ....... RSSI = -29 dBm, Rate = 1.0 Mbps
1170 13:04:14 02.06.2020 [xxxxxx xxxxC1] [xxxxxx xxD776] WiFi:[ ControlBlockAck] ....... RSSI = -32 dBm, Rate = 24.0 Mbps
1192 13:04:16 02.06.2020 [xxxxxx xxxxC1] [xxxxxx xxD776] WiFi:[ ControlBlockAck] ....... RSSI = -31 dBm, Rate = 24.0 Mbps
1205 13:04:16 02.06.2020 [xxxxxx xxxxC1] [xxxxxx xxD776] WiFi:[ ControlRTS] ....... RSSI = -30 dBm, Rate = 1.0 Mbps
And I'm sorry but I can't google it 
Could anybody explain what does hostapd_public_action mean and which it may be?
Regards
Aleksey