/etc/wpa_supplicant/wpa_supplicant.conf
network={
        ssid="SERVER"
        scan_ssid=1
        proto=RSN
        key_mgmt=WPA-PSK
        pairwise=CCMP
        group=CCMP
        psk="MEINPASSWORT"
}


# sudo wpa_supplicant -i wlan0 -D wext -c /etc/wpa_supplicant/wpa_supplicant.conf -d
Initializing interface 'wlan0' conf '/etc/wpa_supplicant/wpa_supplicant.conf' driver 'wext' ctrl_interface 'N/A' bridge 'N/A'
Configuration file '/etc/wpa_supplicant/wpa_supplicant.conf' -> '/etc/wpa_supplicant/wpa_supplicant.conf'
Reading configuration file '/etc/wpa_supplicant/wpa_supplicant.conf'
Priority group 0
   id=0 ssid='SERVER'
Interface wlan0 set UP - waiting a second for the driver to complete initialization
SIOCGIWRANGE: WE(compiled)=22 WE(source)=21 enc_capa=0xf
  capabilities: key_mgmt 0xf enc 0xf flags 0x0
WEXT: Operstate: linkmode=1, operstate=5
Own MAC address: f4:ec:38:87:1d:d2
wpa_driver_wext_set_wpa
wpa_driver_wext_set_key: alg=0 key_idx=0 set_tx=0 seq_len=0 key_len=0
wpa_driver_wext_set_key: alg=0 key_idx=1 set_tx=0 seq_len=0 key_len=0
wpa_driver_wext_set_key: alg=0 key_idx=2 set_tx=0 seq_len=0 key_len=0
wpa_driver_wext_set_key: alg=0 key_idx=3 set_tx=0 seq_len=0 key_len=0
wpa_driver_wext_set_countermeasures
wpa_driver_wext_set_drop_unencrypted
RSN: flushing PMKID list in the driver
Setting scan request: 0 sec 100000 usec
WPS: UUID based on MAC address - hexdump(len=16): 7c 85 33 05 95 2c 58 47 a0 8d e9 55 7c aa a6 93
WPS: Build Beacon and Probe Response IEs
WPS:  * Version
WPS:  * Wi-Fi Protected Setup State (0)
WPS:  * Version
WPS:  * Wi-Fi Protected Setup State (0)
WPS:  * Response Type (2)
WPS:  * UUID-E
WPS:  * Manufacturer
WPS:  * Model Name
WPS:  * Model Number
WPS:  * Serial Number
WPS:  * Primary Device Type
WPS:  * Device Name
WPS:  * Config Methods (0)
WPS:  * RF Bands (3)
EAPOL: SUPP_PAE entering state DISCONNECTED
EAPOL: KEY_RX entering state NO_KEY_RECEIVE
EAPOL: SUPP_BE entering state INITIALIZE
EAP: EAP entering state DISABLED
Added interface wlan0
RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
Wireless event: cmd=0x8b19 len=16
Received 0 bytes of scan results (0 BSSes)
New scan results available
Selecting BSS from priority group 0
Try to find WPA-enabled AP
Try to find non-WPA AP
No suitable AP found.
Not rescheduling scan to ensure that specific SSID scans occur
RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
Wireless event: cmd=0x8b06 len=12
State: DISCONNECTED -> SCANNING
Starting AP scan (specific SSID)
Scan SSID - hexdump_ascii(len=5):
     7a 73 6f 6c 61                                    SERVER           
Trying to get current scan results first without requesting a new scan to speed up initial association
Received 0 bytes of scan results (0 BSSes)
Cached scan results are empty - not posting
Selecting BSS from priority group 0
Try to find WPA-enabled AP
Try to find non-WPA AP
No suitable AP found.
Setting scan request: 0 sec 0 usec
Starting AP scan (broadcast SSID)
Scan requested (ret=0) - scan timeout 30 seconds
EAPOL: disable timer tick
RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
Wireless event: cmd=0x8b19 len=16
Received 0 bytes of scan results (0 BSSes)
New scan results available
Selecting BSS from priority group 0
Try to find WPA-enabled AP
Try to find non-WPA AP
No suitable AP found.
Setting scan request: 5 sec 0 usec
Starting AP scan (specific SSID)
Scan SSID - hexdump_ascii(len=5):
     7a 73 6f 6c 61                                    SERVER           
ioctl[SIOCSIWSCAN]: Device or resource busy
Scan requested (ret=-1) - scan timeout 30 seconds
Failed to initiate AP scan.
Setting scan request: 10 sec 0 usec
RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
Wireless event: cmd=0x8b19 len=16
Received 0 bytes of scan results (0 BSSes)
New scan results available
Selecting BSS from priority group 0
Try to find WPA-enabled AP
Try to find non-WPA AP
No suitable AP found.
Not rescheduling scan to ensure that specific SSID scans occur
Starting AP scan (broadcast SSID)
ioctl[SIOCSIWSCAN]: Device or resource busy
Scan requested (ret=-1) - scan timeout 30 seconds
Failed to initiate AP scan.
Setting scan request: 10 sec 0 usec
RTM_NEWLINK: operstate=0 ifi_flags=0x1003 ([UP])
RTM_NEWLINK, IFLA_IFNAME: Interface 'wlan0' added
Wireless event: cmd=0x8b19 len=16
Received 0 bytes of scan results (0 BSSes)
New scan results available
Selecting BSS from priority group 0
Try to find WPA-enabled AP
Try to find non-WPA AP
No suitable AP found.
Not rescheduling scan to ensure that specific SSID scans occur
^CCTRL-EVENT-TERMINATING - signal 2 received
Removing interface wlan0
State: SCANNING -> DISCONNECTED
wpa_driver_wext_set_operstate: operstate 0->0 (DORMANT)
WEXT: Operstate: linkmode=-1, operstate=5
No keys have been configured - skip key clearing
EAPOL: External notification - portEnabled=0
EAPOL: External notification - portValid=0
wpa_driver_wext_set_wpa
wpa_driver_wext_set_drop_unencrypted
wpa_driver_wext_set_countermeasures
No keys have been configured - skip key clearing
Cancelling scan request
Cancelling authentication timeout
WEXT: Operstate: linkmode=0, operstate=6