diff --git a/README.md b/README.md
index 5e2288f..5d40560 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ For example this system can be used with:
 * And more...
 
 
-The MQTT broker Mosquitto is integrated into the package and requires its own domain or subdomain. It's an optional setting: during install if you set the same domain as your main app domain, it won't be installed.
+The MQTT broker Mosquitto is integrated into the package and requires its own domain or subdomain. It's an optional setting.
 You may also install the [Mosquitto package](https://github.com/YunoHost-Apps/mosquitto_ynh) without using the one provided by domoticz_ynh.
 
 **Shipped version:** 2024.2~ynh1
diff --git a/README_fr.md b/README_fr.md
index 2b0373b..9bac8bd 100644
--- a/README_fr.md
+++ b/README_fr.md
@@ -29,7 +29,7 @@ Il peut par exemple être utilisé avec :
 * des voltmètres
 * Et bien d'autres
 
-Le broker MQTT Mosquitto est intégré au package et nécessite un sous-domaine ou un domaine distinct. Il est optionnel : si vous indiquez lors de l'installation le même domaine que le domaine principal, il ne sera pas installé.
+Le broker MQTT Mosquitto est intégré au package et nécessite un sous-domaine ou un domaine distinct. Il est optionnel.
 Vous pouvez également installer le [package pour Mosquitto](https://github.com/YunoHost-Apps/mosquitto_ynh) sans utiliser celui de domoticz_ynh.
 
 
diff --git a/doc/ADMIN.md b/doc/ADMIN.md
index 8fe3921..65fc151 100644
--- a/doc/ADMIN.md
+++ b/doc/ADMIN.md
@@ -4,6 +4,7 @@
 
 During installation, a [MQTT](https://en.wikipedia.org/wiki/MQTT) broker, [Mosquitto](https://mosquitto.org/), is installed at the same time as Domoticz.
 This broker requires a dedicated domain or subdomain to work (ex : mqtt.your.domain.tld): creating this domain prior installation is a prerequisite
+You may also install the [Mosquitto package](https://github.com/YunoHost-Apps/mosquitto_ynh) without using the one provided by domoticz_ynh.
 
 #### Adding in Domoticz
 
diff --git a/doc/ADMIN_fr.md b/doc/ADMIN_fr.md
index b437195..db729cc 100644
--- a/doc/ADMIN_fr.md
+++ b/doc/ADMIN_fr.md
@@ -4,6 +4,7 @@
 
 À l'installation, un broker [MQTT](https://fr.wikipedia.org/wiki/MQTT), [Mosquitto](https://mosquitto.org/), est installé en même temps que Domoticz.
 Ce broker nécessite un domaine ou un sous-domaine particulier pour fonctionner (ex : mqtt.your.domain.tld) : il est nécessaire de créer ce domaine auparavant.
+Vous pouvez également installer le [package pour Mosquitto](https://github.com/YunoHost-Apps/mosquitto_ynh) sans utiliser celui de domoticz_ynh.
 
 #### Ajout dans Domoticz
 
diff --git a/doc/DESCRIPTION.md b/doc/DESCRIPTION.md
index 0df7708..2acb4ce 100644
--- a/doc/DESCRIPTION.md
+++ b/doc/DESCRIPTION.md
@@ -12,5 +12,5 @@ For example this system can be used with:
 * And more...
 
 
-The MQTT broker Mosquitto is integrated into the package and requires its own domain or subdomain. It's an optional setting: during install if you set the same domain as your main app domain, it won't be installed.
+The MQTT broker Mosquitto is integrated into the package and requires its own domain or subdomain. It's an optional setting.
 You may also install the [Mosquitto package](https://github.com/YunoHost-Apps/mosquitto_ynh) without using the one provided by domoticz_ynh.
\ No newline at end of file
diff --git a/doc/DESCRIPTION_fr.md b/doc/DESCRIPTION_fr.md
index 5d030f0..8fce85a 100644
--- a/doc/DESCRIPTION_fr.md
+++ b/doc/DESCRIPTION_fr.md
@@ -11,7 +11,7 @@ Il peut par exemple être utilisé avec :
 * des voltmètres
 * Et bien d'autres
 
-Le broker MQTT Mosquitto est intégré au package et nécessite un sous-domaine ou un domaine distinct. Il est optionnel : si vous indiquez lors de l'installation le même domaine que le domaine principal, il ne sera pas installé.
+Le broker MQTT Mosquitto est intégré au package et nécessite un sous-domaine ou un domaine distinct. Il est optionnel.
 Vous pouvez également installer le [package pour Mosquitto](https://github.com/YunoHost-Apps/mosquitto_ynh) sans utiliser celui de domoticz_ynh.
 
 
diff --git a/doc/PRE_INSTALL.md b/doc/PRE_INSTALL.md
index aca87ed..ef94d9d 100644
--- a/doc/PRE_INSTALL.md
+++ b/doc/PRE_INSTALL.md
@@ -1,4 +1,6 @@
 ## Mosquitto Broker
 
-During installation, a [MQTT](https://en.wikipedia.org/wiki/MQTT) broker, [Mosquitto](https://mosquitto.org/), may be installed at the same time as Domoticz. It's an optional setting: during install if you set the same domain as your main app domain, it won't be installed.
+During installation, a [MQTT](https://en.wikipedia.org/wiki/MQTT) broker, [Mosquitto](https://mosquitto.org/), may be installed at the same time as Domoticz. 
 This broker requires a dedicated domain or subdomain to work (ex: mqtt.your.domain.tld) : creating this domain prior installation is a prerequisite.
+It's an optional setting: during install if you set, for the MQTT domain, the same domain as your main app domain or enter an empty domain, the broker won't be installed.
+
diff --git a/doc/PRE_INSTALL_fr.md b/doc/PRE_INSTALL_fr.md
index 3a91d2a..16c2e80 100644
--- a/doc/PRE_INSTALL_fr.md
+++ b/doc/PRE_INSTALL_fr.md
@@ -1,4 +1,6 @@
 ## Broker MQTT Mosquitto
 
-À l'installation, un broker [MQTT](https://fr.wikipedia.org/wiki/MQTT), [Mosquitto](https://mosquitto.org/), peut être installé en même temps que Domoticz. Il est optionnel et si vous indiquez lors de l'installation le même domaine que le domaine principal, il ne sera pas installé.
+À l'installation, un broker [MQTT](https://fr.wikipedia.org/wiki/MQTT), [Mosquitto](https://mosquitto.org/), peut être installé en même temps que Domoticz.
 Ce broker nécessite un domaine ou un sous-domaine particulier pour fonctionner (ex : mqtt.your.domain.tld) : il est nécessaire de créer ce domaine auparavant.
+Il est optionnel et si vous indiquez lors de l'installation un domaine vide ou le même domaine que le domaine principal pour le domaine MQTT, le broker ne sera pas installé.
+
diff --git a/doc/PRE_UPGRADE.d/2023.1~ynh1.md b/doc/PRE_UPGRADE.d/2023.1~ynh1.md
index 626ee01..bb8bb96 100644
--- a/doc/PRE_UPGRADE.d/2023.1~ynh1.md
+++ b/doc/PRE_UPGRADE.d/2023.1~ynh1.md
@@ -1,3 +1,9 @@
+###
+BEWARE! If you did not activate the Mosquitto Broker within this package, please run following command prior to upgrade:
+````yunohost app setting $app mqtt_domain -v your.$app.domain.tld````
+Failure to do so may break the app.
+If you did activate the Mosquitto broker, you can proceed safely.
+
 ###Changelog
 - Move to packaging v2
 - From now on, upgrade of the upstream app will not be handled into the app anymore: a new package version will be published for a new Domoticz version. Internal upgrade is disabled (although you may still use the command line)
diff --git a/manifest.toml b/manifest.toml
index b6b38db..05ea90e 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -46,8 +46,8 @@ ram.runtime = "50M"
     [install.mqtt_domain]
     ask.fr = "Domaine MQTT"
     ask.en = "MQTT domain"
-    help.fr = "Domaine pour le serveur MQTT. Remettez le domaine principal si vous ne souhaitez pas l'utiliser. Lire la documentation pour plus d'informations"
-    help.en = "MQTT server domain. Set the main domain if you don't wish to use it. See the doc for more info"
+    help.fr = "Domaine pour le serveur MQTT. Remettez le domaine principal ou à vide si vous ne souhaitez pas l'utiliser. Lire la documentation pour plus d'informations"
+    help.en = "MQTT server domain. Set blank or the main domain if you don't wish to use it. See the doc for more info"
     type = "domain"
     optional = true
 
@@ -75,12 +75,17 @@ ram.runtime = "50M"
 
         [resources.permissions]
         main.url = "/"
-        main.auth_header=false
+        main.auth_header = false
 
-        api.url = "/_api/__APP_"
+        api.url = "__DOMAIN__/api_/__APP__"
         api.show_tile = false
         api.allowed = "visitors"
 
+        #Permission will be removed by the install script if not needed
+        mqtt.url = "__MQTT_DOMAIN__/"
+        mqtt.show_tile = false
+        mqtt.allowed = "visitors"
+
         [resources.ports]
         main.default = 8080
         #to be checked if it can become conditionnal
diff --git a/scripts/change_url b/scripts/change_url
index f24f08e..49a869c 100644
--- a/scripts/change_url
+++ b/scripts/change_url
@@ -14,11 +14,7 @@ source /usr/share/yunohost/helpers
 #=================================================
 ynh_script_progression --message="Loading installation settings..."
 
-# Needed for helper "ynh_add_nginx_config"
-final_path=$(ynh_app_setting_get --app=$app --key=final_path)
-port=$(ynh_app_setting_get --app=$app --key=port)
 old_api=$(ynh_app_setting_get --app=$app --key=api_path)
-
 if [ "$new_path" == "/" ]; then
 	new_api=/api_/$app
 else
diff --git a/scripts/install b/scripts/install
index 51ea914..e19734e 100755
--- a/scripts/install
+++ b/scripts/install
@@ -84,6 +84,9 @@ if [ "$domain" != "$mqtt_domain" ]; then
 	mosquitto_passwd -U "/etc/mosquitto/conf.d/"$app"_credentials"
 
 	ynh_print_info --message="The credential to the mosquitto server has been saved in the settings of the app"
+else
+	#If no MQTT have been set, we delete the mqtt permission.
+	ynh_permission_delete --permission="mqtt"
 fi
 
 
@@ -160,19 +163,6 @@ fi
 
 # Create a dedicated Fail2Ban config
 ynh_add_fail2ban_config --logpath="$log_file" --failregex="^.*Error: Failed login attempt from <HOST>.*$" --max_retry=5
-#Not required in 2023.1 anymore
-#ynh_print_info --message="If you wish for Fail2ban to work, set up your local address in Setup/Settings/System/Local Networks as per documentation"
-
-#=================================================
-# SETUP SSOWAT
-#=================================================
-ynh_script_progression --message="Configuring permissions..."
-
-
-#API & MQTT should stay publicly accessible.  
-#ynh_permission_create --permission="domoticz_API" --label="api" --url="$domain$api_path" --allowed="visitors" --show_tile="false" --protected="true"
-[[ "$domain" != "$mqtt_domain" ]] && ynh_permission_create --permission="domoticz_MQTT" --label="MQTT" --url="$mqtt_domain" --allowed="visitors" --show_tile="false" --protected="true"
-
 
 #=================================================
 # END OF SCRIPT
diff --git a/scripts/remove b/scripts/remove
index 699fc6c..357cb48 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -23,8 +23,6 @@ if [ "$domain" != "$mqtt_domain" ]; then
 	ynh_secure_remove --file="/etc/nginx/conf.d/"$mqtt_domain".d/mqtt_"$app".conf"
 	yunohost tools regen-conf postfix
 	ynh_secure_remove --file="/var/log/mosquitto"
-
-
 fi
 
 ynh_script_progression --message="Removing system configurations related to $app..." --weight=1
diff --git a/scripts/restore b/scripts/restore
index 96056d2..e5c2de0 100755
--- a/scripts/restore
+++ b/scripts/restore
@@ -70,6 +70,9 @@ chown -R "$app":"$app" "$install_dir"
 if [ "$domain" != "$mqtt_domain" ]; then
 	ynh_script_progression --message="Reinstalling up mosquitto..." --weight=5
 	ynh_restore_file --origin_path="/etc/mosquitto/conf.d" --not_mandatory
+else
+	#If no MQTT have been set, we delete the mqtt permission.
+	ynh_permission_delete --permission="mqtt"
 fi
 
 #=================================================
diff --git a/scripts/upgrade b/scripts/upgrade
index 8e0ff75..ee61431 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -61,15 +61,6 @@ if [[ -z "${mqtt_domain+x}" ]]; then
 	ynh_app_setting_set --app="$app" --key=mqtt_domain --value="$mqtt_domain"
 fi
 
-# Create the permission "domoticz_MQTT" only if it doesn't exist.
-if [ "$domain" != "$mqtt_domain"  ]; then
-	if ! ynh_permission_exists --permission="domoticz_MQTT"
-	then
-		# API Authorization with dedicated URL
-		ynh_permission_create --permission="domoticz_MQTT" --label="MQTT" --url="$mqtt_domain" --allowed="visitors" --show_tile="false" --protected="true"
-	fi
-fi
-
 #remove unwanted log folder
 if [ -d "/var/log/$app/$app" ]; then
 	ynh_secure_remove "/var/log/$app/$app"
@@ -131,6 +122,9 @@ if [ "$domain" != "$mqtt_domain"  ]; then
 
 		ynh_print_info --message="The credential to the mosquitto server has been saved in the settings of the app"
 	fi
+else
+	#If no MQTT have been set, we delete the mqtt permission.
+	ynh_permission_delete --permission="mqtt"
 fi
 
 #=================================================
@@ -190,8 +184,6 @@ fi
 
 # Create a dedicated Fail2Ban config
 ynh_add_fail2ban_config --logpath="$log_file" --failregex="^.*Error: Failed login attempt from <HOST>.*$" --max_retry=5
-#not required in 2023.1 anymore
-#ynh_print_info --message="If you wish for Fail2ban to work, set up your local address in Setup/Settings/System/Local Networks as per documentation"
 
 #=================================================
 # INTEGRATE SERVICE IN YUNOHOST
diff --git a/tests.toml b/tests.toml
index 3aa3a03..7a6e53f 100644
--- a/tests.toml
+++ b/tests.toml
@@ -8,6 +8,11 @@ test_format = 1.0
     yunohost domain add mqtt.domain.tld
     """
 
+    preupgrade = """
+    set -euxo pipefail
+    yunohost app setting domoticz mqtt_domain -v sub.domain.tld
+    """
+
     args.mqtt_domain="sub.domain.tld"
     test_upgrade_from.a96510c.name = "2024.2"
     test_upgrade_from.a96510c.args.mqtt_domain="sub.domain.tld"