Fix connection mechanism between Chronometer and FTL

Signed-off-by: DL6ER <dl6er@dl6er.de>

advanced/Scripts/chronometer.sh

@@ -13,6 +13,7 @@ LC_NUMERIC=C
 
 # Retrieve stats from FTL engine
 pihole-FTL() {
+    local ftl_port LINE
     ftl_port=$(cat /run/pihole-FTL.port 2> /dev/null)
     if [[ -n "$ftl_port" ]]; then
         # Open connection to FTL
@@ -20,12 +21,13 @@ pihole-FTL() {
 
         # Test if connection is open
         if { "true" >&3; } 2> /dev/null; then
-            # Send command to FTL
-            echo -e ">$1" >&3
+            # Send command to FTL and ask to quit when finished
+            echo -e ">$1 >quit" >&3
 
-            # Read input
+            # Read input until we received an empty string and the connection is
+            # closed
             read -r -t 1 LINE <&3
-            until [[ ! $? ]] || [[ "$LINE" == *"EOM"* ]]; do
+            until [[ -z "${LINE}" ]] && [[ ! -t 3 ]]; do
                 echo "$LINE" >&1
                 read -r -t 1 LINE <&3
             done