diff --git a/wireguard/wgportal_peer_install.sh b/wireguard/wgportal_peer_install.sh
index 3f43fa2..b335bdb 100755
--- a/wireguard/wgportal_peer_install.sh
+++ b/wireguard/wgportal_peer_install.sh
@@ -3,6 +3,20 @@
 # TODO :
 # - add root user detection
 # - verify curl output to prevent overwriting config file with an HTTP answer
+# - verify trailling slash existenz at the end of the URL param
+
+VER=0.1
+
+LOG_LEVEL_1=1
+LOG_LEVEL_2=2
+LOG_LEVEL_3=3
+DEFAULT_LOG_LEVEL="$LOG_LEVEL_1"
+
+DEBUG_LEVEL_1=1
+DEBUG_LEVEL_2=2
+DEBUG_LEVEL_3=3
+DEBUG_LEVEL_DEFAULT=$DEBUG_LEVEL_1
+DEBUG_LEVEL_NONE=0
 
 _usage() {
   echo "
@@ -24,6 +38,67 @@ _version() {
   printf "USE AT YOUR OWN RISK and read the code before\n"
 }
 
+_printargs() {
+  _exitstatus="$?"
+  if [ -z "$NO_TIMESTAMP" ] || [ "$NO_TIMESTAMP" = "0" ]; then
+    printf -- "%s" "[$(date)] "
+  fi
+  if [ -z "$2" ]; then
+    printf -- "%s" "$1"
+  else
+    printf -- "%s" "$1='$2'"
+  fi
+  printf "\n"
+  # return the saved exit status
+  return "$_exitstatus"
+}
+
+__debug_bash_helper() {
+  # At this point only do for --debug 3
+  if [ "${DEBUG:-$DEBUG_LEVEL_NONE}" -lt "$DEBUG_LEVEL_3" ]; then
+    return
+  fi
+  # Return extra debug info when running with bash, otherwise return empty
+  # string.
+  if [ -z "${BASH_VERSION}" ]; then
+    return
+  fi
+  # We are a bash shell at this point, return the filename, function name, and
+  # line number as a string
+  _dbh_saveIFS=$IFS
+  IFS=" "
+  # Must use eval or syntax error happens under dash. The eval should use
+  # single quotes as older versions of busybox had a bug with double quotes and
+  # eval.
+  # Use 'caller 1' as we want one level up the stack as we should be called
+  # by one of the _debug* functions
+  eval '_dbh_called=($(caller 1))'
+  IFS=$_dbh_saveIFS
+  eval '_dbh_file=${_dbh_called[2]}'
+  if [ -n "${_script_home}" ]; then
+    # Trim off the _script_home directory name
+    eval '_dbh_file=${_dbh_file#$_script_home/}'
+  fi
+  eval '_dbh_function=${_dbh_called[1]}'
+  eval '_dbh_lineno=${_dbh_called[0]}'
+  printf "%-40s " "$_dbh_file:${_dbh_function}:${_dbh_lineno}"
+}
+
+_debug() {
+#  Log to file not implemented
+#  if [ "${LOG_LEVEL:-$DEFAULT_LOG_LEVEL}" -ge "$LOG_LEVEL_1" ]; then
+#    _log "$@"
+#  fi
+# Sending log to syslog not implemented
+#  if [ "${SYS_LOG:-$SYSLOG_LEVEL_NONE}" -ge "$SYSLOG_LEVEL_DEBUG" ]; then
+#    _syslog "$SYSLOG_DEBUG" "$@"
+#  fi
+  if [ "${DEBUG:-$DEBUG_LEVEL_NONE}" -ge "$DEBUG_LEVEL_1" ]; then
+    _bash_debug=$(__debug_bash_helper)
+    _printargs "${_bash_debug}$@" >&2
+  fi
+}
+
 _startswith() {
   _str="$1"
   _sub="$2"
@@ -34,14 +109,19 @@ _download() {
   [ -z "$WGPORTAL_URL" ] && printf "Please set wg-portal URL (see help)\n" && return 1
   [ -z "$WG_CONFFILE" ] && WG_CONFFILE=/etc/wireguard/wg0.conf
 
+  _debug "Using server: $WGPORTAL_URL"
+
   trap 'stty echo; exit 99;' INT
 
-  if [ -f $WG_CONFFILE -a "$OVERWRITE" != "on" ]; then
-    printf "WARNING : Wireguard config file already exists\n"
-    printf "Exiting now to prevent override of your actual parameters\n"
-    printf "You can force config overwriting with :\n"
-    printf "OVERWRITE=on %s %s\n" "$0" "$_ARGS"
-    exit 1;
+  if [ -f $WG_CONFFILE ]; then
+    if [ "$__OVERWRITE" = "on" ]; then
+      _debug "File already exists but overwritting as requested"
+    else
+      printf "WARNING : Wireguard config file already exists\n"
+      printf "Exiting now to prevent override of your actual parameters\n"
+      printf "You can force config overwriting with --overwrite parameter\n"
+      exit 1;
+    fi
   fi
 
   printf "Username: "
@@ -57,13 +137,18 @@ _download() {
   IFS= read -r wgpubkey
   printf "\n"
 
-  HTTP_STATUS=$(curl -w "%{http_code}" -G -s -o $WG_CONFFILE --user $username:$password --data-urlencode "pkey=$wgpubkey" -X GET $WGPORTAL_URL"api/v1/provisioning/peer" -H  "accept: text/plain")
+  WGPORTAL_APIURL=$WGPORTAL_URL"api/v1/provisioning/peer"
+  _debug "GET request to $WGPORTAL_APIURL"
+  HTTP_STATUS=$(curl -w "%{http_code}" -G -s -o $WG_CONFFILE --user $username:$password --data-urlencode "PublicKey=$wgpubkey" -X GET $WGPORTAL_APIURL -H  "accept: text/plain")
   res=$?
   if [ "$res" != "0" ]; then
     echo "the curl command failed with: $res"
   fi
 
-  [ $HTTP_STATUS -ne 200 ] &&  printf "Curl returned HTTP code %s\n" "$HTTP_STATUS" && exit 1
+  if [ $HTTP_STATUS -ne 200 ]; then
+    printf "Curl returned HTTP code %s\n" "$HTTP_STATUS"
+    exit 1;
+  fi
 
   printf "WG config successfully download at %s\n" "$WG_CONFFILE"
 }
@@ -97,6 +182,17 @@ _process() {
       --install | -i)
         _CMD="install"
         ;;
+      --debug)
+        if [ -z "$2" ] || _startswith "$2" "-"; then
+          DEBUG="$DEBUG_LEVEL_DEFAULT"
+        else
+          DEBUG="$2"
+          shift
+        fi
+        ;;
+      --overwrite)
+        __OVERWRITE="on"
+        ;;
       *)
         printf "Unknown parameter : %s\n" "$1"
         return 1
@@ -105,6 +201,10 @@ _process() {
 
     shift 1
   done
+  if [ ! "$_CMD" ]; then
+    printf "Nothing to do, please specify a command (see --help)\n"
+  fi
+
   case "${_CMD}" in
     download)
       _download