diff --git a/opkg.sh b/opkg.sh
index 19d60bf..62ef5b9 100755
--- a/opkg.sh
+++ b/opkg.sh
@@ -3,7 +3,7 @@
 # set -x
 
 compute_md5 () {
-        exec {fd}< <(md5sum "$1")   # open fd readable for P.S.
+        execdownload_opkg {fd}< <(md5sum "$1")   # open fd readable for P.S.
         cs_pid=$!                   # remember pid of P.S.
         md5="" 
         while read t <&$fd; do
@@ -149,7 +149,55 @@ write_config() {
     # echo $(cat "/tmp/test.txt" | jq -C --indent 4 '.') > /tmp/test2.txt
 }
 
-write_config "/home/root/szeged/customer_281/szeged/1/1/" "test.txt"
+# write_config "/home/root/szeged/customer_281/szeged/1/1/" "test.txt"
 
+    # x=$(cat "/home/root/szeged/customer_281/szeged/1/1/test.txt" | jq .opkg.atbqt)
+    #echo $x
 
+# Download opkg-package. After the download, extract data.tar.gz to
+# access e.g. atbqt.
+download_opkg_package () {
+
+    case "$1" in
+        atbqt)  # hier weitere packete eintragen
+        ;;
+
+        *)
+            printf "ERROR $1 has wrong format\n" >&2
+            return 1
+        ;;
+    esac
+    
+    exec {fdd}< <(opkg --download-only download "$1")   # open fd readable for P.S.
+    cs_pid=$!                           # remember pid of P.S.
+
+    opkg_result=""
+    while read result <&$fdd; do
+        if ! [ -z "$result" ]; then
+            opkg_result+="$result"
+        fi
+    done
+
+    exec {fdd}>&-                        # close fd (i.e. process substitution)
+    wait $cs_pid                        # wait for the subshell to finish
+
+    if [ -z "$opkg_result" ]; then
+        printf "ERROR empty opkg_result\n" >&2
+        return 1
+    fi
+                
+    if ! grep -qF "$1" <<< $opkg_result; then
+        printf "ERROR opkg_result [$opkg_result] does not contain $1\n" >&2
+        return 1
+    fi
+    
+    if ! grep -qF "$2" <<< $opkg_result; then
+        printf "ERROR opkg_result [$opkg_result] does not contain $2\n" >&2
+        return 1
+    fi
+
+    # printf "%s\n" $opkg_result
+    return 0
+}
+# download_opkg_package "atbqt" "atbqt_1.0.0-r1_cortexa9t2hf-neon.ipk"