diff --git a/CHANGES_NEXT_RELEASE b/CHANGES_NEXT_RELEASE
index 019fca48..71bef0b4 100644
--- a/CHANGES_NEXT_RELEASE
+++ b/CHANGES_NEXT_RELEASE
@@ -1,2 +1,3 @@
 - Add: check response obj before use it handling http commands
 - Upgrade NodeJS version from 8.16.1 to 10.17.0 in Dockerfile due to Node 8 End-of-Life 
+- Hardening: software quality improvement based on ISO25010 recommendations
\ No newline at end of file
diff --git a/lib/bindings/HTTPBindings.js b/lib/bindings/HTTPBindings.js
index 89bf31b7..e4813f3b 100644
--- a/lib/bindings/HTTPBindings.js
+++ b/lib/bindings/HTTPBindings.js
@@ -57,6 +57,7 @@ function handleError(error, req, res, next) {
         name: error.name,
         message: error.message
     });
+    next();
 }
 
 function parseData(req, res, next) {
@@ -203,6 +204,7 @@ function returnCommands(req, res, next) {
     } else {
         res.status(200).send('');
     }
+    next();
 }
 
 function handleIncomingMeasure(req, res, next) {
diff --git a/lib/bindings/MQTTBinding.js b/lib/bindings/MQTTBinding.js
index 1b81840f..645c9512 100644
--- a/lib/bindings/MQTTBinding.js
+++ b/lib/bindings/MQTTBinding.js
@@ -278,7 +278,7 @@ function start(callback) {
             }
         });
         mqttClient.on('message', commonBindings.mqttMessageHandler);
-        mqttClient.on('connect', function(ack) {
+        mqttClient.on('connect', function() {
             config.getLogger().info(context, 'MQTT Client connected');
             recreateSubscriptions();
         });
diff --git a/lib/commonBindings.js b/lib/commonBindings.js
index 7bebe31f..bd8b0376 100644
--- a/lib/commonBindings.js
+++ b/lib/commonBindings.js
@@ -112,10 +112,9 @@ function manageConfigurationRequest(apiKey, deviceId, device, objMessage) {
  * @param {String} apikey       APIKey of the service the device belongs to.
  * @param {Array} previous      Array of prepared functions that send information to the Context Broker.
  * @param {Object} current      Information sent by the device.
- * @param {Number} index        Index of the group in the array.
  * @return {Array}             Updated array of functions.
  */
-function processMeasureGroup(device, apikey, previous, current, index) {
+function processMeasureGroup(device, apikey, previous, current) {
     var values = [];
 
     if (current.command) {
diff --git a/lib/iotaUtils.js b/lib/iotaUtils.js
index eb0afe49..103ea72f 100644
--- a/lib/iotaUtils.js
+++ b/lib/iotaUtils.js
@@ -154,6 +154,10 @@ function mergeDeviceWithConfiguration(deviceData, configuration, callback) {
             deviceData[fields[i]] = configuration[confField];
         } else if (!deviceData[fields[i]] && (!configuration || !configuration[confField])) {
             deviceData[fields[i]] = defaults[i];
+        } else {
+            config
+                .getLogger()
+                .debug(context, 'at field "' + fields[i] + '" configuration merging logic did not merge anything');
         }
 
         if (deviceData[fields[i]] && ['active', 'lazy', 'commands'].indexOf(fields[i]) >= 0) {