Role network-batman: update batman-ifaces due to fastd instance change

- update README.md

roles/network-batman/README.md

@@ -21,6 +21,19 @@ meshes:
       gw: # string: gateway mode
       mm: # boolean: multicast mode
       dat: # boolean: distributed arp table
+      hop_penalty: # integer: hop penalty
+...
+    fastd:
+      nodes:
+        instances:
+          - id: 0 # integer
+            mtu: # integer
+          ...
+      intragate:
+        instances:
+          - id: 0 # integer
+            mtu: # integer
+          ...
 
 ´´´
 - Host Variable `magic`

roles/network-batman/templates/batman.j2

@@ -1,3 +1,4 @@
+#jinja2: trim_blocks:False
 {% set ip4hex = item.ipv4_network | ipaddr('net') | ipaddr(magic) | ipaddr('address') | ip4_hex() -%}
 {% set mac = '0201' + ip4hex -%}
 #
@@ -6,7 +7,7 @@
 auto {{ item.id }}BAT
 iface {{ item.id }}BAT
     hwaddress {{ mac | hwaddr('linux') }}
-    batman-ifaces {{ item.id }}0 {{ item.id }}VPN {{ item.id }}igVPN
+    batman-ifaces {{ item.id }}0 {% for instance in item.fastd.nodes.instances %}{{ item.id }}VPN-{{ instance.mtu }}{% if not loop.last %} {% endif %}{% endfor %} {% for instance in item.fastd.intragate.instances %}{{ item.id }}igVPN-{{ instance.mtu }}{% if not loop.last %} {% endif %}{% endfor %}
     batman-hop-penalty {{ item.batman.hop_penalty }}
     post-up /usr/sbin/batctl -m $IFACE it {{ item.batman.it }}
     post-up /usr/sbin/batctl -m $IFACE gw {{ item.batman.gw }}