added connectivity check

check_heating.sh

@@ -2,6 +2,7 @@
 
 IMAGE_URL="http://webcam.intern.yannikenss.de/image.jpg"
 TRESHOLD=0.009
+HOSTNAME="webcam.intern.yannikenss.de"
 
 while getopts ":i:c:" opt; do
   case $opt in
@@ -20,6 +21,15 @@ done
 OUTPUT="UNKNOWN: Script failed"
 EXIT_CODE=3
 
+ping -q -c 2 "$HOSTNAME" > /dev/null
+if [[ $? -ne 0 ]]
+then
+    OUTPUT="UNKNOWN: Webcam down"
+    EXIT_CODE=3
+    echo "$OUTPUT"
+    exit $EXIT_CODE
+fi
+
 error_file=$(mktemp)
 
 for i in {1..3}