olsr12: add readme

package/gluon-mesh-olsr12-openvpn/README.md

@@ -0,0 +1,62 @@
+# ffgraz-mesh-olsr12-openvpn
+
+This package is used to allow a seamless olsr2 migration
+in an existing olsr1 mesh,
+by connecting to a shared openvpn server that is reachable from
+the olsr1 mesh.
+
+Technical presentation (german): https://docs.google.com/presentation/d/1IPWPsQH3fNRfGLB4s2G2gFVltrFcg6gDKNvkcgMcsvA/edit#slide=id.g122e82f6b82_0_50
+
+Configuration for site.conf
+
+```
+{
+  mesh = {
+    olsrd = {
+      -- ...
+      olsr12 = {
+        enable = true,
+        server = 'OLSR-IP',
+        ca = [[
+paste openvpn ca here
+        ]],
+      },
+      -- ....
+    },
+  },
+```
+
+OpenVPN server
+
+```
+local OLSR-IP
+port 1194
+proto udp
+
+dev olsr12
+dev-type tap
+server 10.8.0.0 255.255.255.0
+
+keepalive 10 120
+
+persist-key
+persist-tun
+
+verify-client-cert none
+username-as-common-name
+script-security 3
+auth-user-pass-verify /bin/true via-env
+
+status /var/log/olsr12-openvpn-status.log
+log-append /var/log/olsr12-openvpn.log
+
+data-ciphers-fallback none
+dh none
+
+ca /var/olsr12.ca.crt
+cert /var/olsr12.crt
+key /var/olsr12.key
+
+verb 3
+explicit-exit-notify 1
+```