Update HealthCheck for auto-recover TUN down (#1373)

* Update tunnelDown.sh

Add attempt to restart TUN

scripts/healthcheck.sh

@@ -16,6 +16,29 @@ STATUS=$?
 if [[ ${STATUS} -ne 0 ]]
 then
     echo "Network is down"
+    INTERFACE=$(ls /sys/class/net | grep tun)
+    ISINTERFACE=$?
+
+    if [[ ${ISINTERFACE} -ne 0 ]]
+    then
+        echo "TUN Interface not found"
+        exit 1
+    fi
+
+    echo "Resetting TUN"
+    ip link set ${INTERFACE} down
+    sleep 1
+    ip link set ${INTERFACE} up
+    echo "Sent kill SIGUSR1 to openvpn"
+    pkill -SIGUSR1 openvpn
+    sleep 20
+fi
+
+ping -c 1 $HOST
+STATUS=$?
+if [[ ${STATUS} -ne 0 ]]
+then
+    echo "Network is still down"
     exit 1
 fi