Add 'callhome.sh'

callhome.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+USER=
+HOST=
+
+while true; do
+  ssh -NC -o ServerAliveInterval=5 \
+    -o UserKnownHostsFile=/dev/null \
+    -o StrictHostKeyChecking=no \
+    -R '<int IP>:50022:<rem IP>:22' \
+    $USER@$HOST
+  sleep 5
+done