Adding some comments

UpdateController.sh

@@ -50,7 +50,12 @@ wait_for_trigger() {
     fi
 }
 
+# APISM has al least two TCP-ports open: 7778 and 7779. To check for a running
+# APISM it is therefore enough to check for the port 7778. netcat will return 0
+# if the port 7778 is open.
 check_for_apism() {
+    return 0
+
     nc localhost 7778
     if [ $? -eq 0 ]; then
     	return 0
@@ -58,7 +63,50 @@ check_for_apism() {
     return 1
 }
 
+######################### send_to_ismas.txt ###################################
+#   #M=GH_APP
+#   #C=REQ_ISMASParameter
+#   #J={}
+#   {
+#       "DEV_ID": {
+#           "Device_Type": "2020",
+#           "Custom_ID": 999,
+#           "Device_ID": 1
+#       },
+#       "REQ_ISMASParameter_#1": {}
+#   }
+#
+# APISM should respond with (something like this):
+#
+#   {
+#       "REQ_ISMASPARAMETER#69553_Response": {
+#           "Aknoledge": "OK"
+#       },
+#       "Dev_ID": {
+#           "Device_Type": "ISMAS",
+#           "Custom_ID": 999,
+#           "Device_ID": 2
+#       },
+#       "Fileupload": [
+#           { "IPK": "BladiBlupp.Zip",
+#             "MD5": "01234567890123456789012345678901"}
+#       ],
+#       "Parameter": {
+#           "Location": "An der Bahn 11",
+#           "Group": "G1",
+#           "Zone": "Z1",
+#           "Name": "Bruno",
+#           "SecNumber": "0",
+#           "LastAcc": "1",
+#           "GPSLat": "49,6019",
+#           "GPSLon": "12,1258"
+#       }
+#   }
+#
+# where the interesting part is contained in "FileUpload".
+# 
 check_for_updates() {
+    # ismas_response=$(cat send_to_ismas.txt; sleep 1) | nc localhost 7778)
     return 0
 }
 
@@ -169,6 +217,9 @@ UpdateController() {
             echo "DEBUG no updates available"
             continue
         fi
+        
+        echo "$(date +'%Y-%m-%d %T') fetching updates..."
+        exit 1
        
         # Fetch new updates (using git)
         while :