Status WLAN0:
ip link show wlan0

SSID's to connect:
iwlist wlan0 scan
or
iwlist wlan0 scan | grep <SSID>

To ensure that the WLAN is operational all the time and no „Power-Save“ is kicking the device out of the LAN while idele disable the Power-Save option of the Edimax-driver.

For that create a conf-file:

vi /etc/modprobe.d/8192cu.conf

And insert the following content:

options 8192cu rtw_power_mgnt=0 rtw_enusbss=0

Get rid of ifplugd, nice feature but nasty when the tun0 interface of chilli comes up and everything else goes down:

apt-get remove ifplugd

Enrich the intefaces file with static configuration for eth0 and WLAN0 (Remember this RASPBERRY will run as a Server!!!):

/etc/network/interfaces

# lo Loop-Back Interface Config
auto lo
iface lo inet loopback


#ETH0 Config
auto eth0
### ETH0 DHCP Config
#        iface eth0 inet dhcp

### ETH0 Static IP Config        
        iface eth0 inet static
	address 10.1.1.1
        netmask 255.255.255.0
        network 10.1.1.0
        #address 192.168.112.100
        #network 192.168.112.0 

# WLAN0 Config
auto wlan0
allow-hotplug wlan0

### WLAN0 DHCP Config
#        iface wlan0 inet dhcp


### WLAN0 Static IP Config 
        iface wlan0 inet static 
        address 192.168.2.6
        netmask 255.255.255.0
        network 192.168.2.0
        gateway 192.168.2.1

        
### WLAN0 Security        
        wpa-ap-scan 1
        wpa-scan-ssid 1
        #### WLAN SSID e.g "Your-WLAN-Name"
        wpa-ssid "home-sweet-home"
        #### WLAN PSK Key in clear text or as passphrase generated with: wpa_passphrase $ssid $clear-text-key
        wpa-psk "??????????????????????????????????????????????????????"

sudo service networking restart

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