I built an embedded Linux using Buildroot and I have some trouble to stay connected to my AP. Cannot get an IP address more than once.
I use wpa_supplicant to connect to my AP using WPA2-PSK. It works with other AP such as my smartphone in AP mode.
When I use iwconfig wlan0 I see that I'm associated with my 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
But I cannot get an IP address with ifup wlan0
udhcpc (v1.22.1) started
Sending discover...
Sending discover...
Sending discover...
No lease, failing
I should say that I'm able to get an IP address only once. If I reboot this is not possible anymore.
I managed to install dhclient instead of using the default DHCP client of Busybox but nothing happens (I stay blocked indefinitely)
dhclient wlan0
According to my kernel messages, it seems that I'm not continuously associated
[ 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)
...
The logs of my 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
The logs when it works (only once)
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
How to solve it?