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WL1837MOD: Tx Beacon: Beacon Expiry. Consecutive Beacon Miss

Part Number: WL1837MOD

Hi, I have WL1837MOD WiFi module in AP mode. Our device use Linux OS, kernel 4.14.138. From kernel log:

  wlcore: wl18xx HW: 183x or 180x, PG 2.2 (ROM 0x11)
  wlcore: loaded
  wlcore: PHY firmware version: Rev 8.2.0.0.242
  wlcore: firmware booted (Rev 8.9.0.0.79)

It works fine in the most cases, but sometimes (seldom) it starts and doesn't work. In this case fwlog is full of "Tx Beacon: Beacon Expiry. Consecutive Beacon Miss" messages, see attached 45407450.csv log file. AP cannot be discovered by scan. Hostapd status looks fine:

  state=ENABLED
  phy=phy5
  freq=2462
  num_sta_non_erp=0
  num_sta_no_short_slot_time=0
  num_sta_no_short_preamble=0
  olbc=0
  num_sta_ht_no_gf=0
  num_sta_no_ht=0
  num_sta_ht_20_mhz=0
  num_sta_ht40_intolerant=0
  olbc_ht=0
  ht_op_mode=0x0
  cac_time_seconds=0
  cac_time_left_seconds=N/A
  channel=11
  secondary_channel=0
  ieee80211n=1
  ieee80211ac=0
  ieee80211ax=0
  beacon_int=100
  dtim_period=2
  ht_caps_info=000c
  ht_mcs_bitmask=ff000000000000000000
  supported_rates=02 04 0b 16 0c 12 18 24 30 48 60 6c
  max_txpower=30
  bss[0]=wlan02
  bssid[0]=7e:ec:79:f9:0a:10
  ssid[0]=WiFi_AP2_55_56_access_list
  num_sta[0]=0

Unload/reload of kernel module and restart of hostapd helps. AP is located in laboratory with many (more than about 30) other APs around.

My questions:

  1. What this message mean - exactly?
  2. Was beacon actually sent or not if this message occurs?

45407450.csv