Check for presence of wlan1

src/freedombone-client

   echo 'BRIDGE=br-mesh' >> $batman_script
   echo 'IFACE=wlan0' >> $batman_script
   echo 'EIFACE=eth0' >> $batman_script
-  echo 'IFACE_EXISTS=$(grep "$IFACE" /proc/net/dev)' >> $batman_script
+  echo '' >> $batman_script
+  echo 'if grep -q "wlan1" /proc/net/dev; then' >> $batman_script
+  echo '    IFACE=wlan1' >> $batman_script
+  echo 'fi' >> $batman_script
   echo '' >> $batman_script
   echo 'if [ -e /etc/default/batctl ]; then' >> $batman_script
   echo '    . /etc/default/batctl' >> $batman_script
   echo '    fi' >> $batman_script
   echo '}' >> $batman_script
   echo '' >> $batman_script
-  echo 'if [ ! $IFACE_EXISTS ]; then' >> $batman_script
+  echo 'if ! grep -q "$IFACE" /proc/net/dev; then' >> $batman_script
   echo '    echo "Interface $IFACE was not found"' >> $batman_script
   echo '    stop' >> $batman_script
   echo '    exit 1' >> $batman_script