diff --git a/opkg.sh b/opkg.sh
index e3e7b7c..19d60bf 100755
--- a/opkg.sh
+++ b/opkg.sh
@@ -1,20 +1,75 @@
 #!/bin/bash
 
+# set -x
+
+compute_md5 () {
+        exec {fd}< <(md5sum "$1")   # open fd readable for P.S.
+        cs_pid=$!                   # remember pid of P.S.
+        md5="" 
+        while read t <&$fd; do
+            if ! [ -z "$t" ]; then
+                t=($t)              # md5sum returns two values:
+                                    # the hash plus the filename
+                md5="${md5}$t"
+            fi
+        done
+
+        exec {fd}>&-                # close fd (i.e. process substitution)
+        wait $cs_pid                # wait for the subshell to finish
+        echo $md5
+}
+
+md5_for_ini_files() {
+        ini_directory="$1"
+        ini_files=("ISMASMgr.ini" "sysconfig.ini" "SystemControl.ini")
+    
+        local data="\"ini\": {"$'\n'
+
+        for f in "${ini_files[@]}"; do
+            ini_file=${ini_directory}/$f
+            md5=`compute_md5 $ini_file`
+            data+="\"$ini_file\":\"$md5\","
+        done
+        
+        if [[ "$data" =~ ^.*,$ ]]; then
+            data=${data%?}
+        fi
+
+        data+="},"
+        echo $data
+}
+
+md5_for_conf_files() {
+        conf_directory="$1"
+        conf_files=("emp.conf" "printer.conf" "device.conf")
+    
+        local data="\"conf\": {"$'\n'
+
+        for f in "${conf_files[@]}"; do
+            conf_file=${conf_directory}/$f
+            md5=`compute_md5 $conf_file`
+            data+="\"$conf_file\":\"$md5\","
+        done
+        
+        if [[ "$data" =~ ^.*,$ ]]; then
+            data=${data%?}
+        fi
+
+        data+="},"
+        echo $data
+}
+
 write_config() {
         local path="$1"
-        local data="{
-    \"ini\"   : {
-        \"/opt/app/sysconfig/ISMASMgr.ini\"       : \"d41d8cd98f00b204e9800998ecf8427e\",
-        \"/opt/app/sysconfig/sysconfig.ini\"      : \"d41d8cd98f00b204e9800998ecf8427e\",
-        \"/opt/app/sysconfig/SystemControl.ini\"  : \"d41d8cd98f00b204e9800998ecf8427e\"
-    },
-    \"conf\"  : {
-        \"szeged/1/1/etc/psa_config/emp.conf\"    : \"d41d8cd98f00b204e9800998ecf8427e\",
-        \"szeged/1/1/etc/psa_config/printer.conf\": \"d41d8cd98f00b204e9800998ecf8427e\",
-        \"szeged/1/1/etc/psa_config/device.conf\" : \"d41d8cd98f00b204e9800998ecf8427e\"
-    },
-    \"opkg\"  : {"
+        if [ "${path: -1}" == "/" ]; then  # remove trailing '/'
+            path=${path%?}
+        fi 
 
+        local data="{ "$'\n'
+        data+=`md5_for_ini_files "$path/opt/app/sysconfig"`
+        data+=`md5_for_conf_files "$path/etc/psa_config"`
+        data+="
+    \"opkg\"  : {"
         local cnt=0
         for package_name in $(opkg list-installed); # list names of installed packages
         do 
@@ -79,6 +134,8 @@ write_config() {
             $md5sum
             $filename
             $installed_time"
+
+            # break
         done
 
         if [[ "$data" =~ ^.*,$ ]]; then
@@ -88,10 +145,11 @@ write_config() {
         data="$data
     }
 }"
-        echo "$data" > "$path/test.txt"
+    echo "$data" > "${path}/$2"
+    # echo $(cat "/tmp/test.txt" | jq -C --indent 4 '.') > /tmp/test2.txt
 }
 
-ddd={ date -d @10000000 +'%Y'; }
-echo $ddd
+write_config "/home/root/szeged/customer_281/szeged/1/1/" "test.txt"
+
+
 
-# write_config "/tmp/customer_281/szeged" "test.txt"