diff --git a/enedisgateway2mqtt/config.json b/enedisgateway2mqtt/config.json
index 2192ff682..6198cacee 100644
--- a/enedisgateway2mqtt/config.json
+++ b/enedisgateway2mqtt/config.json
@@ -26,7 +26,8 @@
     "CONSUMPTION_PRICE_BASE": "str?",
     "CONSUMPTION_PRICE_HC": "str?",
     "CONSUMPTION_PRICE_HP": "str?",
-    "CARD_MYENEDIS": "str?"
+    "CARD_MYENEDIS": "str?",
+    "custom_var": "str?"
   },
   "slug": "enedisgateway2mqtt",
   "upstream": "0.6.0",
diff --git a/enedisgateway2mqtt/rootfs/scripts/99-run.sh b/enedisgateway2mqtt/rootfs/scripts/99-run.sh
index 090402bba..bf94ea7ac 100644
--- a/enedisgateway2mqtt/rootfs/scripts/99-run.sh
+++ b/enedisgateway2mqtt/rootfs/scripts/99-run.sh
@@ -5,28 +5,62 @@
 #################
 
 # Create the config file
-mkdir -p /config/enedisgateway2mqtt
-touch /config/enedisgateway2mqtt/enedisgateway2mqtt.conf
+CONFIGSOURCE="/config/enedisgateway2mqtt/enedisgateway2mqtt.conf" #file
+mkdir -p "$(dirname "${CONFIGSOURCE}")"                           #create dir
+touch ${CONFIGSOURCE}                                             #create file
 
-# Read the config file
+##########################
+# Read all addon options #
+##########################
+bashio::log.info "All variables defined in the addon will be exported to the config file located in /config/enedisgateway2mqtt"
 
-#################
-# Create config #
-#################
-echo " "
-bashio::log.info "Setting variables"
-echo " "
-for VARIABLES in "ACCESS_TOKEN" "PDL" "MQTT_HOST" "MQTT_PORT" "MQTT_PREFIX" "MQTT_CLIENT_ID" "MQTT_USERNAME" "MQTT_PASSWORD" "RETAIN" "QOS" "GET_CONSUMPTION" "GET_PRODUCTION" "HA_AUTODISCOVERY" "HA_AUTODISCOVERY_PREFIX" "CONSUMPTION_PRICE_BASE" "CONSUMPTION_PRICE_HC" "CONSUMPTION_PRICE_HP" "CARD_MYENEDIS"; do
-    if bashio::config.has_value $VARIABLES; then
-        export $VARIABLES=$(bashio::config $VARIABLES)
-        echo "$VARIABLES set to $(bashio::config $VARIABLES)"
+# Get the default keys from the original file
+JSONSOURCE="/data/options.json"
+mapfile -t arr < <(jq -r 'keys[]' ${JSONSOURCE})
+# For all keys in options.json
+for KEYS in ${arr[@]}; do
+    # if the custom_var field is used
+    if ${KEYS} ="custom_var"; then
+        VALUES=$(jq .$KEYS ${JSONSOURCE})
+        for SUBKEYS in ${VALUES//,/ }; do
+            [[ ! $SUBKEYS =~ ^.+[=].+$ ]] && bashio::log.fatal "Your custom_var field does not follow the structure KEY=\"text\",KEY2=\"text2\" it will be ignored" && continue || true
+            # Remove if already existing
+            sed -i "/$KEYS/ d" ${CONFIGSOURCE} &>/dev/null || true
+            # Write it in the config file
+            echo "${KEYS}=$(jq .$KEYS ${JSONSOURCE})" >>${CONFIGSOURCE}
+            # Say it loud
+            echo "... ${KEYS}=$(jq .$KEYS ${JSONSOURCE})"
+        done
+    # If it is a normal field
+    else
+        # Remove if already existing
+        sed -i "/$KEYS/ d" ${CONFIGSOURCE} &>/dev/null || true
+        # Write it in the config file
+        echo "${KEYS}=$(jq .$KEYS ${JSONSOURCE})" >>${CONFIGSOURCE}
+        # Say it loud
+        echo "... ${KEYS}=$(jq .$KEYS ${JSONSOURCE})"
     fi
 done
-echo " "
-bashio::log.info "Starting the app"
-echo " "
+
+###########################
+# Read all config options #
+###########################
+
+# Replace all "" with ''
+sed -i 's|"|'\''|g' $CONFIGSOURCE
+
+# For all keys in config file
+for word in $(cat $CONFIGSOURCE); do
+    [[ ! $word =~ ^.+[=].+$ ]] && bashio::log.fatal "$word does not follow the structure KEY=\'text\', it will be ignored" || true
+    export "$word" # Export the variable
+    echo "$word"
+done
 
 ##############
 # Launch App #
 ##############
+echo " "
+bashio::log.info "Starting the app"
+echo " "
+
 python -u /app/main.py || bashio::log.fatal "The app has crashed. Are you sure you entered the correct config options?"