ESP32 Forum

Hi folk,

I have a strange problem to connect to ssid with strongest rssi when the same ssid is visible with different rssi's or/and different channels, like this:

I (3170) scan: SSID MY Wifi
I (3170) scan: RSSI -67
I (3180) scan: BSSID 84:39:8f:fe:86:db
I (3180) scan: Authmode WIFI_AUTH_WPA2_PSK
I (3180) scan: Pairwise Cipher WIFI_CIPHER_TYPE_CCMP
I (3190) scan: Group Cipher WIFI_CIPHER_TYPE_CCMP
I (3190) scan: Channel 11

I (3270) scan: SSID MY Wifi
I (3270) scan: RSSI -77
I (3280) scan: BSSID 84:39:8f:32:cc:9b
I (3280) scan: Authmode WIFI_AUTH_WPA2_PSK
I (3280) scan: Pairwise Cipher WIFI_CIPHER_TYPE_CCMP
I (3290) scan: Group Cipher WIFI_CIPHER_TYPE_CCMP
I (3290) scan: Channel 6

I (3540) scan: SSID MY Wifi
I (3550) scan: RSSI -79
I (3550) scan: BSSID 84:39:8f:fa:ae:bb
I (3550) scan: Authmode WIFI_AUTH_WPA2_PSK
I (3560) scan: Pairwise Cipher WIFI_CIPHER_TYPE_CCMP
I (3560) scan: Group Cipher WIFI_CIPHER_TYPE_CCMP
I (3570) scan: Channel 11

via forced bssid_set = 1 and given bssid I can connect always to 84:39:8f:32:cc:9b and 84:39:8f:fa:ae:bb,
but never to 84:39:8f:fe:86:db, which is the strongest AP.
I use simple esp-idf example: wifi getting_started station, modified with bssid stuff.

I get error reason: 2 toggling with 205, extend log shows something wrong with authorization

I (52214) wifi:(connect)dot11_authmode:0x3, pairwise_cipher:0x3, group_cipher:0x3
I (52214) wifi:state: init -> auth (0xb0)
I (53224) wifi:state: auth -> init (0x200)
I (53234) wifi<11,0>, old:<11,0>, ap:<255,255>, sta:<11,0>, prof:1, snd_ch_cfg:0x0

any hints ?

Thanks,
Mike

What happens if you change ESP_WIFI_SCAN_AUTH_MODE_THRESHOLD to something other than WIFI_AUTH_WPA2_PSK?
You can change this in menuconfig.

Hello,

I tried all combinations,
no changes

Regards,
Mike

I disabled password at AP,
and set wifi_config to:

wifi_config_t wifi_config = {
.sta = {
.ssid = "MY Wifi",
.password = "",
.threshold.authmode = WIFI_AUTH_OPEN,
.bssid_set = 0,
},
};

get the same error:

wifi<6,0>, old:<9,0>, ap:<255,255>, sta:<6,0>, prof:1, snd_ch_cfg:0x0
I (59210) wifi:state: init -> auth (0xb0)
I (60230) wifi:state: auth -> init (0x200)
I (60240) wifi<6,0>, old:<6,0>, ap:<255,255>, sta:<6,0>, prof:1, snd_ch_cfg:0x0
I (60240) wifi station: WIFI_EVENT_STA_DISCONNECTED: reason: 2

pretty weird, because there is no authorization anymore

Cheers,
Mike

What happens if You turn off these two WiFi routers?


I (3180) scan: BSSID 84:39:8f:fe:86:db

I (3280) scan: BSSID 84:39:8f:32:cc:9b

If multiple WiFi routers are transmitting signals in a small space, interference can occur.

I have three Wi-Fi routers in my room, each with a different SSID.
When I add a fourth one with a different SSID it is not recognized.

the APs are not under our control, it is an external IT company,

but I could fix it by adding one line before esp wifi start:

...
ESP_ERROR_CHECK(esp_wifi_config_11b_rate(WIFI_IF_STA, true));
ESP_ERROR_CHECK(esp_wifi_start());
...

my theorie is:
APs do not support old 11B protocol anymore, but ESP32 starts with it and wants to negociate password in that mode.

the line above disables 11B protocol in ESP32, and connection starts immediatly

Cheers,
Mike