diff --git a/UpdateController.sh b/UpdateController.sh
index c2a37c4..ab659a4 100755
--- a/UpdateController.sh
+++ b/UpdateController.sh
@@ -1,11 +1,32 @@
 #!/bin/bash
 
+update_controller_pipe="/tmp/update_controller_pipe"
+
+init () {
+    trap "rm -f $update_controller_pipe" EXIT
+
+    if [[ ! -p $update_controller_pipe ]]; then
+        mkfifo $update_controller_pipe
+    fi
+}
+
 read_config() {
+    # name der fifo laesst sich ueberschreiben
     return 0
 }
 
 wait_for_trigger() {
-    return 0
+    if [[ "$1" -eq -1 ]]; then
+        # wait for external impulse
+        if read line <$update_controller_pipe; then
+            if [ "$line" == "quit" ] || [ "$line" == "update" ]; then
+                echo "$line"
+            fi
+        fi
+    else
+        sleep ${1}
+        echo "sleep"
+    fi
 }
 
 check_for_apism() {
@@ -78,7 +99,15 @@ UpdateController() {
 
     # By default (trigger_timeout==-1), UpdateController can only be triggered
     # from some external source to perform an update.
-    while wait_for_trigger $trigger_timeout; do
+    while :
+    do
+        request=$(wait_for_trigger $trigger_timeout)
+        if [ ${request} = "quit" ]; then
+            $trigger_reboot = true
+        elif [ ${request} != "update" ]; then
+            continue
+        fi
+
         if $trigger_reboot; then
             echo "CRITICAL send message to reboot the PSA"
             send_reboot_message_to_system_controller