WLAN configuration on sd card

Normally you can use the wifi in access point mode or a existing ethernet connection to configure your wifi network. There is also the possibility to define the connection settings manually. Therefore you create the file /boot/repetier-network.xml which should like this, just with correct data:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
    <!-- repeat the following network block for each network it should log in -->
    <network active="true"> <!-- set active to false if you do not want to try to connect to that network. -->
        <!-- Neighbouring networks can be added with ignore true, so they do not get listed all the time
        making it easier to select the network -->
        <!-- use hidden="true" for hidden ssid. This will make the network the only one
        that gets tried to connect since we do not know if it is there or not. -->
        <ssid hidden="false">DemoSSID</ssid>
        <!-- password method must none, psk2, psk or wep -->
        <password method="psk2">TestPassword</password>
        <!-- Normally you leave the following parameter to auto so values retrieved
        from your dhcp server are used. Change them only if you need to enforce different
        values. -->

Because it is in the /boot directory, you can also just insert the sd card to your pc and windows will show that directory (you see the linux config files cmdline.txt and config.txt as well).

On the next reboot this config will be used with priority. This config is not deletable in the wlan settings!