diff --git a/manifest.json b/manifest.json
index 70417a2..de6b4f1 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,9 +6,9 @@
 		"en": "Network-wide ad blocking via your own DNS server.",
 		"fr": "Filtrage publicitaire sur l'ensemble du réseau via votre propre serveur DNS."
 	},
-	"version": "3.1.4",
+	"version": "3.1.4~ynh1",
 	"url": "https://pi-hole.net/",
-	"license": " EUPL-1.2",
+	"license": "EUPL-1.2",
 	"maintainer": {
 		"name": "Maniack Crudelis",
 		"email": "maniackc_dev@crudelis.fr"
diff --git a/scripts/_common.sh b/scripts/_common.sh
index f395dfa..883fe5e 100755
--- a/scripts/_common.sh
+++ b/scripts/_common.sh
@@ -1,31 +1,5 @@
 #!/bin/bash
 
-#=================================================
-# DISPLAYING
-#=================================================
-
-NO_PRINT () {	# Supprime l'affichage dans stdout pour la commande en argument.
-	set +x
-	$@
-	set -x
-}
-
-WARNING () {	# Écrit sur le canal d'erreur pour passer en warning.
-	$@ >&2
-}
-
-SUPPRESS_WARNING () {	# Force l'écriture sur la sortie standard
-	$@ 2>&1
-}
-
-QUIET () {	# Redirige la sortie standard dans /dev/null
-	$@ > /dev/null
-}
-
-ALL_QUIET () {	# Redirige la sortie standard et d'erreur dans /dev/null
-	$@ > /dev/null 2>&1
-}
-
 #=================================================
 # BACKUP
 #=================================================
@@ -42,8 +16,8 @@ CHECK_SIZE () {	# Vérifie avant chaque backup que l'espace est suffisant
 
 	if [ $free_space -le $backup_size ]
 	then
-		WARNING echo "Espace insuffisant pour sauvegarder $file_to_analyse."
-		WARNING echo "Espace disponible: $(HUMAN_SIZE $free_space)"
+		ynh_print_err "Espace insuffisant pour sauvegarder $file_to_analyse."
+		ynh_print_err "Espace disponible: $(HUMAN_SIZE $free_space)"
 		ynh_die "Espace nécessaire: $(HUMAN_SIZE $backup_size)"
 	fi
 }
@@ -57,7 +31,7 @@ IS_PACKAGE_CHECK () {	# Détermine une exécution en conteneur (Non testé)
 }
 
 #=================================================
-# NODEJS
+# EXPERIMENTAL HELPERS
 #=================================================
 
 # INFOS
@@ -233,3 +207,357 @@ EOF
 
 	chmod +x "/etc/cron.daily/node_update"
 }
+
+#=================================================
+
+# Start or restart a service and follow its booting
+#
+# usage: ynh_check_starting "Line to match" [Log file] [Timeout]
+#
+# | arg: Line to match - The line to find in the log to attest the service have finished to boot.
+# | arg: Log file - The log file to watch
+# /var/log/$app/$app.log will be used if no other log is defined.
+# | arg: Timeout - The maximum time to wait before ending the watching. Defaut 300 seconds.
+ynh_check_starting () {
+	local line_to_match="$1"
+	local app_log="${2:-/var/log/$app/$app.log}"
+	local timeout=${3:-300}
+
+	ynh_clean_check_starting () {
+		# Stop the execution of tail.
+		kill -s 15 $pid_tail 2>&1
+		ynh_secure_remove "$templog" 2>&1
+	}
+
+	echo "Starting of $app" >&2
+	systemctl restart $app
+	local templog="$(mktemp)"
+	# Following the starting of the app in its log
+	tail -f -n1 "$app_log" > "$templog" &
+	# Get the PID of the tail command
+	local pid_tail=$!
+
+	local i=0
+	for i in `seq 1 $timeout`
+	do
+		# Read the log until the sentence is found, that means the app finished to start. Or run until the timeout
+		if grep --quiet "$line_to_match" "$templog"
+		then
+			echo "The service $app has correctly started." >&2
+			break
+		fi
+		echo -n "." >&2
+		sleep 1
+	done
+	if [ $i -eq $timeout ]
+	then
+		echo "The service $app didn't fully started before the timeout." >&2
+	fi
+
+	echo ""
+	ynh_clean_check_starting
+}
+
+#=================================================
+
+ynh_print_log () {
+  echo "${1}"
+}
+
+# Print an info on stdout
+#
+# usage: ynh_print_info "Text to print"
+# | arg: text - The text to print
+ynh_print_info () {
+  ynh_print_log "[INFO] ${1}"
+}
+
+# Print a warning on stderr
+#
+# usage: ynh_print_warn "Text to print"
+# | arg: text - The text to print
+ynh_print_warn () {
+  ynh_print_log "[WARN] ${1}" >&2
+}
+
+# Print a error on stderr
+#
+# usage: ynh_print_err "Text to print"
+# | arg: text - The text to print
+ynh_print_err () {
+  ynh_print_log "[ERR] ${1}" >&2
+}
+
+# Execute a command and print the result as an error
+#
+# usage: ynh_exec_err command to execute
+# usage: ynh_exec_err "command to execute | following command"
+# In case of use of pipes, you have to use double quotes. Otherwise, this helper will be executed with the first command, then be send to the next pipe.
+#
+# | arg: command - command to execute
+ynh_exec_err () {
+	ynh_print_err "$(eval $@)"
+}
+
+# Execute a command and print the result as a warning
+#
+# usage: ynh_exec_warn command to execute
+# usage: ynh_exec_warn "command to execute | following command"
+# In case of use of pipes, you have to use double quotes. Otherwise, this helper will be executed with the first command, then be send to the next pipe.
+#
+# | arg: command - command to execute
+ynh_exec_warn () {
+	ynh_print_warn "$(eval $@)"
+}
+
+# Execute a command and force the result to be printed on stdout
+#
+# usage: ynh_exec_warn_less command to execute
+# usage: ynh_exec_warn_less "command to execute | following command"
+# In case of use of pipes, you have to use double quotes. Otherwise, this helper will be executed with the first command, then be send to the next pipe.
+#
+# | arg: command - command to execute
+ynh_exec_warn_less () {
+	eval $@ 2>&1
+}
+
+# Execute a command and redirect stdout in /dev/null
+#
+# usage: ynh_exec_quiet command to execute
+# usage: ynh_exec_quiet "command to execute | following command"
+# In case of use of pipes, you have to use double quotes. Otherwise, this helper will be executed with the first command, then be send to the next pipe.
+#
+# | arg: command - command to execute
+ynh_exec_quiet () {
+	eval $@ > /dev/null
+}
+
+# Execute a command and redirect stdout and stderr in /dev/null
+#
+# usage: ynh_exec_fully_quiet command to execute
+# usage: ynh_exec_fully_quiet "command to execute | following command"
+# In case of use of pipes, you have to use double quotes. Otherwise, this helper will be executed with the first command, then be send to the next pipe.
+#
+# | arg: command - command to execute
+ynh_exec_fully_quiet () {
+	eval $@ > /dev/null 2>&1
+}
+
+#=================================================
+
+# Install or update the main directory yunohost.multimedia
+#
+# usage: ynh_multimedia_build_main_dir
+ynh_multimedia_build_main_dir () {
+	wget -nv https://github.com/YunoHost-Apps/yunohost.multimedia/archive/master.zip 2>&1
+	unzip -q master.zip
+	./yunohost.multimedia-master/script/ynh_media_build.sh
+}
+
+# Add a directory in yunohost.multimedia
+# This "directory" will be a symbolic link to a existing directory.
+#
+# usage: ynh_multimedia_addfolder "Source directory" "Destination directory"
+#
+# | arg: Source directory - The real directory which contains your medias.
+# | arg: Destination directory - The name and the place of the symbolic link, relative to "/home/yunohost.multimedia"
+ynh_multimedia_addfolder () {
+	local source_dir="$1"
+	local dest_dir="$2"
+	./yunohost.multimedia-master/script/ynh_media_addfolder.sh --source="$source_dir" --dest="$dest_dir"
+}
+
+# Move a directory in yunohost.multimedia, and replace by a symbolic link
+#
+# usage: ynh_multimedia_movefolder "Source directory" "Destination directory"
+#
+# | arg: Source directory - The real directory which contains your medias.
+# It will be moved to "Destination directory"
+# A symbolic link will replace it.
+# | arg: Destination directory - The new name and place of the directory, relative to "/home/yunohost.multimedia"
+ynh_multimedia_movefolder () {
+	local source_dir="$1"
+	local dest_dir="$2"
+	./yunohost.multimedia-master/script/ynh_media_addfolder.sh --inv --source="$source_dir" --dest="$dest_dir"
+}
+
+# Allow an user to have an write authorisation in multimedia directories
+#
+# usage: ynh_multimedia_addaccess user_name
+#
+# | arg: user_name - The name of the user which gain this access.
+ynh_multimedia_addaccess () {
+	local user_name=$1
+	groupadd -f multimedia
+	usermod -a -G multimedia $user_name
+}
+
+#=================================================
+
+# Create a dedicated fail2ban config (jail and filter conf files)
+#
+# usage: ynh_add_fail2ban_config log_file filter [max_retry [ports]]
+# | arg: log_file - Log file to be checked by fail2ban
+# | arg: failregex - Failregex to be looked for by fail2ban
+# | arg: max_retry - Maximum number of retries allowed before banning IP address - default: 3
+# | arg: ports - Ports blocked for a banned IP address - default: http,https
+ynh_add_fail2ban_config () {
+	# Process parameters
+	logpath=$1
+	failregex=$2
+	max_retry=${3:-3}
+	ports=${4:-http,https}
+
+	test -n "$logpath" || ynh_die "ynh_add_fail2ban_config expects a logfile path as first argument and received nothing."
+	test -n "$failregex" || ynh_die "ynh_add_fail2ban_config expects a failure regex as second argument and received nothing."
+
+	finalfail2banjailconf="/etc/fail2ban/jail.d/$app.conf"
+	finalfail2banfilterconf="/etc/fail2ban/filter.d/$app.conf"
+	ynh_backup_if_checksum_is_different "$finalfail2banjailconf" 1
+	ynh_backup_if_checksum_is_different "$finalfail2banfilterconf" 1
+
+	sudo tee $finalfail2banjailconf <<EOF
+[$app]
+enabled = true
+port = $ports
+filter = $app
+logpath = $logpath
+maxretry = $max_retry" 
+EOF
+
+	sudo tee $finalfail2banfilterconf <<EOF
+[INCLUDES]
+before = common.conf
+[Definition]
+failregex = $failregex
+ignoreregrex =" 
+EOF
+
+	ynh_store_file_checksum "$finalfail2banjailconf"
+	ynh_store_file_checksum "$finalfail2banfilterconf"
+
+	sudo systemctl restart fail2ban
+}
+
+# Remove the dedicated fail2ban config (jail and filter conf files)
+#
+# usage: ynh_remove_fail2ban_config
+ynh_remove_fail2ban_config () {
+	ynh_secure_remove "/etc/fail2ban/jail.d/$app.conf"
+	ynh_secure_remove "/etc/fail2ban/filter.d/$app.conf"
+	sudo systemctl restart fail2ban
+}
+
+#=================================================
+
+# Read the value of a key in a ynh manifest file
+#
+# usage: ynh_read_manifest manifest key
+# | arg: manifest - Path of the manifest to read
+# | arg: key - Name of the key to find
+ynh_read_manifest () {
+	manifest="$1"
+	key="$2"
+	python3 -c "import sys, json;print(json.load(open('$manifest'))['$key'])"
+}
+
+# Exit without error if the package is up to date
+#
+# This helper should be used to avoid an upgrade of a package
+# when it's not needed.
+#
+# To force an upgrade, even if the package is up to date,
+# you have to set the variable YNH_FORCE_UPGRADE before.
+# example: sudo YNH_FORCE_UPGRADE=1 yunohost app upgrade MyApp
+#
+# usage: ynh_abort_if_up_to_date
+ynh_abort_if_up_to_date () {
+	local force_upgrade=${YNH_FORCE_UPGRADE:-0}
+	local package_check=${PACKAGE_CHECK_EXEC:-0}
+
+	local version=$(ynh_read_manifest "/etc/yunohost/apps/$YNH_APP_INSTANCE_NAME/manifest.json" "version" || echo 1.0)
+	local last_version=$(ynh_read_manifest "../manifest.json" "version" || echo 1.0)
+	if [ "$version" = "$last_version" ]
+	then
+		if [ "$force_upgrade" != "0" ]
+		then
+			echo "Upgrade forced by YNH_FORCE_UPGRADE." >&2
+			unset YNH_FORCE_UPGRADE
+		elif [ "$package_check" != "0" ]
+		then
+			echo "Upgrade forced for package check." >&2
+		else
+			ynh_die "Up-to-date, nothing to do" 0
+		fi
+	fi
+}
+
+#=================================================
+
+# Send an email to inform the administrator
+#
+# usage: ynh_send_readme_to_admin app_message [recipients]
+# | arg: app_message - The message to send to the administrator.
+# | arg: recipients - The recipients of this email. Use spaces to separate multiples recipients. - default: root
+#	example: "root admin@domain"
+#	If you give the name of a YunoHost user, ynh_send_readme_to_admin will find its email adress for you
+#	example: "root admin@domain user1 user2"
+ynh_send_readme_to_admin() {
+	local app_message="${1:-...No specific informations...}"
+	local recipients="${2:-root}"
+
+	# Retrieve the email of users
+	find_mails () {
+		local list_mails="$1"
+		local mail
+		local recipients=" "
+		# Read each mail in argument
+		for mail in $list_mails
+		do
+			# Keep root or a real email address as it is
+			if [ "$mail" = "root" ] || echo "$mail" | grep --quiet "@"
+			then
+				recipients="$recipients $mail"
+			else
+				# But replace an user name without a domain after by its email
+				if mail=$(ynh_user_get_info "$mail" "mail" 2> /dev/null)
+				then
+					recipients="$recipients $mail"
+				fi
+			fi
+		done
+		echo "$recipients"
+	}
+	recipients=$(find_mails "$recipients")
+
+	local mail_subject="☁️🆈🅽🅷☁️: \`$app\` was just installed!"
+
+	local mail_message="This is an automated message from your beloved YunoHost server.
+
+Specific informations for the application $app.
+
+$app_message
+
+---
+Automatic diagnosis data from YunoHost
+
+$(yunohost tools diagnosis | grep -B 100 "services:" | sed '/services:/d')"
+
+	# Send the email to the recipients
+	echo "$mail_message" | mail -a "Content-Type: text/plain; charset=UTF-8" -s "$mail_subject" "$recipients"
+}
+
+#=================================================
+#============= FUTURE YUNOHOST HELPER ============
+#=================================================
+
+# Delete a file checksum from the app settings
+#
+# $app should be defined when calling this helper
+#
+# usage: ynh_remove_file_checksum file
+# | arg: file - The file for which the checksum will be deleted
+ynh_delete_file_checksum () {
+	local checksum_setting_name=checksum_${1//[\/ ]/_}	# Replace all '/' and ' ' by '_'
+	ynh_app_setting_delete $app $checksum_setting_name
+}
diff --git a/scripts/install b/scripts/install
index 4ae5787..f98ca86 100644
--- a/scripts/install
+++ b/scripts/install
@@ -52,6 +52,7 @@ ynh_app_setting_set $app domain $domain
 ynh_app_setting_set $app path $path_url
 ynh_app_setting_set $app admin $admin
 ynh_app_setting_set $app query_logging $query_logging
+ynh_app_setting_set $app enable_dhcp $enable_dhcp
 
 #=================================================
 # STANDARD MODIFICATIONS
@@ -65,12 +66,12 @@ then
 	ynh_die "The ports 4711 to 4720 are already in use. Pi-hole can't works on another port. Please try to free one of this ports."
 fi
 # Ouvre le port dans le firewall
-ALL_QUIET yunohost firewall allow --no-upnp TCP $port
+ynh_exec_fully_quiet yunohost firewall allow --no-upnp TCP $port
 ynh_app_setting_set $app port $port
 
 # Désactive le port 53 en upnp
-ALL_QUIET yunohost firewall disallow Both 53 --no-reload
-ALL_QUIET yunohost firewall allow Both 53 --no-upnp
+ynh_exec_fully_quiet yunohost firewall disallow Both 53 --no-reload
+ynh_exec_fully_quiet yunohost firewall allow Both 53 --no-upnp
 
 #=================================================
 # INSTALL DEPENDENCIES
@@ -164,11 +165,11 @@ sed -i "/# su #/d;" "$pihole_storage/logrotate"
 git clone https://github.com/pi-hole/FTL
 # Plutôt que télécharger le binaire C, on le compile nous-même.
 ( cd FTL
-SUPPRESS_WARNING make
-SUPPRESS_WARNING make install )
+ynh_exec_warn_less make
+ynh_exec_warn_less make install )
 cp -a $pihole_local_repo/advanced/pihole-FTL.service /etc/init.d/pihole-FTL
 chmod +x /etc/init.d/pihole-FTL
-SUPPRESS_WARNING systemctl enable pihole-FTL
+ynh_exec_warn_less systemctl enable pihole-FTL
 
 #=================================================
 # BUILD THE VARIABLES FILE
@@ -271,7 +272,7 @@ then
 fi
 
 # Open the UDP port 67 for dhcp
-ALL_QUIET yunohost firewall allow UDP 67 --no-upnp
+ynh_exec_fully_quiet yunohost firewall allow UDP 67 --no-upnp
 
 #=================================================
 # RESTART DNSMASQ
@@ -290,7 +291,7 @@ cp $pihole_local_repo/advanced/pihole.cron /etc/cron.d/pihole
 #=================================================
 
 cp "$pihole_local_repo/adlists.default" "$pihole_storage/adlists.default"
-SUPPRESS_WARNING /opt/pihole/gravity.sh
+ynh_exec_warn_less /opt/pihole/gravity.sh
 
 #=================================================
 # START PIHOLE-FTL
@@ -323,3 +324,21 @@ yunohost app addaccess --users=$admin $app
 #=================================================
 
 systemctl reload nginx
+
+#=================================================
+# SEND A README FOR THE ADMIN
+#=================================================
+
+if [ $enable_dhcp -eq 1 ]
+then
+	dhcp_alert="You asked to use the internal DHCP server of dnsmasq with PiHole.
+You should really read the documentation about that, https://github.com/YunoHost-Apps/pihole_ynh/blob/master/dhcp.md
+
+"
+else
+	dhcp_alert=""
+fi
+
+message="${dhcp_alert}If you facing an issue or want to improve this app, please open a new issue in this project: https://github.com/YunoHost-Apps/pihole_ynh"
+
+ynh_send_readme_to_admin "$message" "$admin"
diff --git a/scripts/remove b/scripts/remove
index 25e551d..6f53987 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -26,7 +26,7 @@ port=$(ynh_app_setting_get $app port)
 
 if yunohost service status | grep -q pihole-FTL	# Test l'existence du service dans Yunohost
 then
-	echo "Remove pihole-FTL service"
+	ynh_print_info "Remove pihole-FTL service" >&2
 	yunohost service remove pihole-FTL
 fi
 
@@ -35,7 +35,7 @@ fi
 #=================================================
 
 systemctl stop pihole-FTL
-SUPPRESS_WARNING systemctl disable pihole-FTL
+ynh_exec_warn_less systemctl disable pihole-FTL
 rm -f "/etc/init.d/pihole-FTL" "/usr/bin/pihole-FTL" "/var/run/pihole-FTL.pid" "/var/run/pihole-FTL.port"
 
 #=================================================
@@ -71,14 +71,14 @@ ynh_remove_fpm_config	# Suppression de la configuration du pool php-fpm
 
 if yunohost firewall list | grep -q "\- $port$"
 then
-	echo "Close port $port"
-	QUIET yunohost firewall disallow TCP $port
+	ynh_print_info "Close port $port" >&2
+	ynh_exec_quiet yunohost firewall disallow TCP $port
 fi
 
 if yunohost firewall list | grep -q "\- 67$"
 then
-	echo "Close port 67"
-	QUIET yunohost firewall disallow UDP 67
+	ynh_print_info "Close port 67" >&2
+	ynh_exec_quiet yunohost firewall disallow UDP 67
 fi
 
 #=================================================
@@ -136,7 +136,7 @@ systemctl start dnsmasq
 # REMOVE THE CONF_REGEN HOOK
 #=================================================
 
-rm /usr/share/yunohost/hooks/conf_regen/50-dnsmasq_$app
+ynh_secure_remove /usr/share/yunohost/hooks/conf_regen/50-dnsmasq_$app
 
 #=================================================
 # GENERIC FINALISATION
diff --git a/scripts/restore b/scripts/restore
index c5c47b5..305e1e9 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -32,12 +32,13 @@ app=$YNH_APP_INSTANCE_NAME
 domain=$(ynh_app_setting_get $app domain)
 path_url=$(ynh_app_setting_get $app path)
 final_path=$(ynh_app_setting_get $app final_path)
+enable_dhcp=$(ynh_app_setting_get $app enable_dhcp)
 
 #=================================================
 # CHECK IF THE APP CAN BE RESTORED
 #=================================================
 
-yunohost app checkurl "${domain}${path_url}" -a "$app" \
+ynh_webpath_available $domain $path_url \
 	|| ynh_die "Path not available: ${domain}${path_url}"
 test ! -d $final_path \
 	|| ynh_die "There is already a directory: $final_path "
@@ -184,7 +185,7 @@ ynh_store_file_checksum "$setupVars"	# Enregistre la somme de contrôle du fichi
 # START PIHOLE-FTL
 #=================================================
 
-SUPPRESS_WARNING systemctl enable pihole-FTL
+ynh_exec_warn_less systemctl enable pihole-FTL
 systemctl start pihole-FTL
 
 #=================================================
@@ -195,3 +196,21 @@ systemctl start pihole-FTL
 
 systemctl reload php5-fpm
 systemctl reload nginx
+
+#=================================================
+# SEND A README FOR THE ADMIN
+#=================================================
+
+if [ $enable_dhcp -eq 1 ]
+then
+	dhcp_alert="You asked to use the internal DHCP server of dnsmasq with PiHole.
+You should really read the documentation about that, https://github.com/YunoHost-Apps/pihole_ynh/blob/master/dhcp.md
+
+"
+else
+	dhcp_alert=""
+fi
+
+message="${dhcp_alert}If you facing an issue or want to improve this app, please open a new issue in this project: https://github.com/YunoHost-Apps/pihole_ynh"
+
+ynh_send_readme_to_admin "$message" "$admin"
diff --git a/scripts/upgrade b/scripts/upgrade
index 62e793d..d4d71bf 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -22,6 +22,12 @@ query_logging=$(ynh_app_setting_get $app query_logging)
 final_path=$(ynh_app_setting_get $app final_path)
 port=$(ynh_app_setting_get $app port)
 
+#=================================================
+# CHECK VERSION
+#=================================================
+
+ynh_abort_if_up_to_date
+
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================
@@ -116,11 +122,11 @@ systemctl stop pihole-FTL
 git clone https://github.com/pi-hole/FTL
 # Plutôt que télécharger le binaire C, on le compile nous-même.
 ( cd FTL
-SUPPRESS_WARNING make
-SUPPRESS_WARNING make install )
+ynh_exec_warn_less make
+ynh_exec_warn_less make install )
 cp -a $pihole_local_repo/advanced/pihole-FTL.service /etc/init.d/pihole-FTL
 chmod +x /etc/init.d/pihole-FTL
-SUPPRESS_WARNING systemctl enable pihole-FTL
+ynh_exec_warn_less systemctl enable pihole-FTL
 
 #=================================================
 # BUILD THE VARIABLES FILE