Mudei a opção "Canal automático" para um canal fixo e a opção "Largura do canal" para 20 MHz no meu ponto de acesso e isso resolveu o meu problema.
Eu construí um Linux embutido usando o Buildroot e tenho alguns problemas para permanecer conectado ao meu AP. Não é possível obter um endereço IP mais de uma vez.
Eu uso o wpa_supplicant para me conectar ao meu AP usando o WPA2-PSK. Funciona com outros AP, como o meu smartphone no modo AP.
Quando uso iwconfig wlan0 , vejo que estou associado ao meu AP
wlan0 IEEE 802.11bgn ESSID:"ZyXEL_B3B5"
Mode:Managed Frequency:2.462 GHz Access Point: 90:EF:68:D3:B3:B5
Bit Rate=58.5 Mb/s Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:on
Link Quality=53/70 Signal level=-57 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:1 Missed beacon:0
Mas não consigo obter um endereço IP com ifup wlan0
udhcpc (v1.22.1) started
Sending discover...
Sending discover...
Sending discover...
No lease, failing
Devo dizer que só consigo obter um endereço IP uma vez. Se eu reiniciar, isso não será mais possível.
Consegui instalar dhclient em vez de usar o cliente DHCP padrão do Busybox, mas nada acontece (permaneço bloqueado indefinidamente)
dhclient wlan0
De acordo com as mensagens do meu kernel, parece que não estou continuamente associado
[ 355.459738] wlan0: authenticate with 90:ef:68:d3:b3:b5 (try 1)
[ 355.461366] wlan0: authenticated
[ 355.461416] wlan0: associate with 90:ef:68:d3:b3:b5 (try 1)
[ 355.469353] wlan0: RX AssocResp from 90:ef:68:d3:b3:b5 (capab=0x431 status=0 aid=1)
[ 355.469364] wlan0: associated
[ 365.547863] wlan0: deauthenticating from 90:ef:68:d3:b3:b5 by local choice (reason=3)
[ 365.672765] cfg80211: Calling CRDA to update world regulatory domain
[ 367.169736] wlan0: authenticate with 90:ef:68:d3:b3:b5 (try 1)
[ 367.171421] wlan0: authenticated
[ 367.194859] wlan0: associate with 90:ef:68:d3:b3:b5 (try 1)
[ 367.198561] wlan0: RX AssocResp from 90:ef:68:d3:b3:b5 (capab=0x431 status=0 aid=1)
[ 367.198584] wlan0: associated
[ 377.277864] wlan0: deauthenticating from 90:ef:68:d3:b3:b5 by local choice (reason=3)
[ 377.412822] cfg80211: Calling CRDA to update world regulatory domain
[ 378.899738] wlan0: authenticate with 90:ef:68:d3:b3:b5 (try 1)
[ 378.901668] wlan0: authenticated
[ 378.924732] wlan0: associate with 90:ef:68:d3:b3:b5 (try 1)
[ 378.928437] wlan0: RX AssocResp from 90:ef:68:d3:b3:b5 (capab=0x431 status=0 aid=1)
[ 378.928461] wlan0: associated
[ 389.008120] wlan0: deauthenticating from 90:ef:68:d3:b3:b5 by local choice (reason=3)
[ 389.182888] cfg80211: Calling CRDA to update world regulatory domain
[ 390.689735] wlan0: authenticate with 90:ef:68:d3:b3:b5 (try 1)
[ 390.691415] wlan0: authenticated
[ 390.714734] wlan0: associate with 90:ef:68:d3:b3:b5 (try 1)
[ 390.720847] wlan0: RX AssocResp from 90:ef:68:d3:b3:b5 (capab=0x431 status=0 aid=1)
[ 390.720870] wlan0: associated
[ 400.811246] wlan0: deauthenticating from 90:ef:68:d3:b3:b5 by local choice (reason=3)
...
Os logs do meu AP
338 Nov 16 15:50:53 udhcpd[2404]: Received DISCOVER
339 Nov 16 15:50:53 udhcpd[2404]: unicasting packet to client yiaddr
340 Nov 16 15:50:56 udhcpd[2404]: Received DISCOVER
341 Nov 16 15:50:56 udhcpd[2404]: unicasting packet to client yiaddr
342 Nov 16 15:50:59 udhcpd[2404]: Received DISCOVER
343 Nov 16 15:50:59 udhcpd[2404]: unicasting packet to client yiaddr
Os logs quando funciona (apenas uma vez)
325 Nov 16 15:48:37 udhcpd[2404]: Received DISCOVER
326 Nov 16 15:48:37 udhcpd[2404]: unicasting packet to client yiaddr
327 Nov 16 15:48:37 udhcpd[2404]: Received REQUEST
328 Nov 16 15:48:37 udhcpd[2404]: lease = 11854360
329 Nov 16 15:48:37 udhcpd[2404]: requested = b2a8eb7f
330 Nov 16 15:48:37 udhcpd[2404]: server_id = c0a80101
331 Nov 16 15:48:37 udhcpd[2404]: unicasting packet to client yiaddr
Como resolver isso?