fff-network: Add Interfacetype to nodewatcher data

Some monitoring require information about which interface type an interface is.
We may add more interface types in the future.

Signed-off-by: Christian Dresel <freifunk@dresel.systems>

src/packages/fff/fff-network/files/usr/lib/nodewatcher.d/20-interfaces.sh

@@ -63,6 +63,9 @@ for filename in $(grep 'up\|unknown' /sys/class/net/*/operstate); do
 		/width/{ split($0, w, ": "); sub(/ .*/, "", w[2]); printf "<wlan_width>"w[2]"</wlan_width>" }
 	')
 
+	#Add Interfacetype (e.g. wireguard, fastd, vxlan, ether, etc) to nodewatcher data
+	wg show "${iface}" &> /dev/null && interface_data=$interface_data"<type>wireguard</type>"
+
 	interface_data=$interface_data"</$iface>"
 done