diff --git a/.github/workflows/functional.yml b/.github/workflows/functional.yml
index b8b4bcb597..390188b167 100644
--- a/.github/workflows/functional.yml
+++ b/.github/workflows/functional.yml
@@ -27,18 +27,6 @@ jobs:
         ports:
           - 27017:27017
 
-      mosquitto:
-        # Needed by MQTT notification tests
-        image: eclipse-mosquitto:1.6.15
-        ports:
-        - 1883:1883
-
-      mosquitto-extra:
-        # Needed by MQTT notification tests (multi broker)
-        image: eclipse-mosquitto:1.6.15
-        ports:
-        - 1884:1883
-
     name: functional - ${{ matrix.payload.name }}
 
     strategy:
@@ -58,6 +46,17 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
+      - name: Run Mosquitto container with authenticated user
+        # Why don't to use a service for this (as moquitto-extra above)? It would be the desirable solution, but I haven't able to
+        # configure volumes properly for it (the mosquitto container as service has problems to get the configuration files). Feedback welcome! :)
+        run: docker run -d --name mosquitto -p 1883:1883 -v $(pwd)/test/functionalTest/mosquittoConf:/mosquitto/config:ro eclipse-mosquitto:2.0.11
+
+      - name: Run Extra Mosquitto container used in multibroker tests
+        # Note we are reusing the same volume (although the extra broker does not require authenticated user). We use a service in the past
+        # to implement this (using eclipse-mosquitto:1.6.15) but in eclipse-mosquitto:2.0.11 it seems something in the internal configuration
+        # has changed and it doesn't work if we don't provide the configuration files in the volume. Again, feedback is welcome! :)
+        run: docker run -d --name mosquitto-extra -p 1884:1883 -v $(pwd)/test/functionalTest/mosquittoConf:/mosquitto/config:ro eclipse-mosquitto:2.0.11
+
       - name: Run functional test
         run: |
           docker run  --network host -t --rm -e REPO_ACCESS_TOKEN=${{ secrets.REPO_ACCESS_TOKEN }} ${{ matrix.payload.range }} -v $(pwd):/opt/fiware-orion ${{ env.TEST_IMAGE_NAME }} build -miqts functional
diff --git a/.github/workflows/valgrind-nocache.yml b/.github/workflows/valgrind-nocache.yml
index e8ff06e31b..e7c7e4eb9c 100644
--- a/.github/workflows/valgrind-nocache.yml
+++ b/.github/workflows/valgrind-nocache.yml
@@ -29,18 +29,6 @@ jobs:
         image: mongo:6.0
         ports:
           - 27017:27017
-
-      mosquitto:
-        # Needed by MQTT notification tests
-        image: eclipse-mosquitto:1.6.15
-        ports:
-        - 1883:1883
-
-      mosquitto-extra:
-        # Needed by MQTT notification tests (multi broker)
-        image: eclipse-mosquitto:1.6.15
-        ports:
-        - 1884:1883
     
     name: valgrind - ${{ matrix.payload.name }}
     
@@ -56,6 +44,17 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
+      - name: Run Mosquitto container with authenticated user
+        # Why don't to use a service for this (as moquitto-extra above)? It would be the desirable solution, but I haven't able to
+        # configure volumes properly for it (the mosquitto container as service has problems to get the configuration files). Feedback welcome! :)
+        run: docker run -d --name mosquitto -p 1883:1883 -v $(pwd)/test/functionalTest/mosquittoConf:/mosquitto/config:ro eclipse-mosquitto:2.0.11
+
+      - name: Run Extra Mosquitto container used in multibroker tests
+        # Note we are reusing the same volume (although the extra broker does not require authenticated user). We use a service in the past
+        # to implement this (using eclipse-mosquitto:1.6.15) but in eclipse-mosquitto:2.0.11 it seems something in the internal configuration
+        # has changed and it doesn't work if we don't provide the configuration files in the volume. Again, feedback is welcome! :)
+        run: docker run -d --name mosquitto-extra -p 1884:1883 -v $(pwd)/test/functionalTest/mosquittoConf:/mosquitto/config:ro eclipse-mosquitto:2.0.11
+
       - name: Run valgrind test
         run: |
           docker run  --privileged --network host -t --rm -e REPO_ACCESS_TOKEN=${{ secrets.REPO_ACCESS_TOKEN }} ${{ matrix.payload.range }} -v $(pwd):/opt/fiware-orion ${{ env.TEST_IMAGE_NAME }} build -miqts valgrind
diff --git a/.github/workflows/valgrind.yml b/.github/workflows/valgrind.yml
index 33010b755d..483a9d0c34 100644
--- a/.github/workflows/valgrind.yml
+++ b/.github/workflows/valgrind.yml
@@ -26,18 +26,6 @@ jobs:
         image: mongo:6.0
         ports:
           - 27017:27017
-
-      mosquitto:
-        # Needed by MQTT notification tests
-        image: eclipse-mosquitto:1.6.15
-        ports:
-        - 1883:1883
-
-      mosquitto-extra:
-        # Needed by MQTT notification tests (multi broker)
-        image: eclipse-mosquitto:1.6.15
-        ports:
-        - 1884:1883
     
     name: valgrind - ${{ matrix.payload.name }}
     
@@ -53,6 +41,17 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
+      - name: Run Mosquitto container with authenticated user
+        # Why don't to use a service for this (as moquitto-extra above)? It would be the desirable solution, but I haven't able to
+        # configure volumes properly for it (the mosquitto container as service has problems to get the configuration files). Feedback welcome! :)
+        run: docker run -d --name mosquitto -p 1883:1883 -v $(pwd)/test/functionalTest/mosquittoConf:/mosquitto/config:ro eclipse-mosquitto:2.0.11
+
+      - name: Run Extra Mosquitto container used in multibroker tests
+        # Note we are reusing the same volume (although the extra broker does not require authenticated user). We use a service in the past
+        # to implement this (using eclipse-mosquitto:1.6.15) but in eclipse-mosquitto:2.0.11 it seems something in the internal configuration
+        # has changed and it doesn't work if we don't provide the configuration files in the volume. Again, feedback is welcome! :)
+        run: docker run -d --name mosquitto-extra -p 1884:1883 -v $(pwd)/test/functionalTest/mosquittoConf:/mosquitto/config:ro eclipse-mosquitto:2.0.11
+
       - name: Run valgrind test
         run: |
           docker run  --privileged --network host -t --rm -e REPO_ACCESS_TOKEN=${{ secrets.REPO_ACCESS_TOKEN }} ${{ matrix.payload.range }} -v $(pwd):/opt/fiware-orion ${{ env.TEST_IMAGE_NAME }} build -miqts valgrind
diff --git a/scripts/check_files_compliance.py b/scripts/check_files_compliance.py
index d14574cb39..0ccc974e21 100755
--- a/scripts/check_files_compliance.py
+++ b/scripts/check_files_compliance.py
@@ -138,7 +138,7 @@ def ignore(root, file):
                    'ContributionPolicy.txt', 'CHANGES_NEXT_RELEASE', 'Changelog', 'compileInfo.h',
                    'unittests_that_fail_sporadically.txt', 'Vagrantfile', 'contextBroker.ubuntu',
                    'mkdocs.yml', 'fiware-ngsiv2-reference.errata', 'ServiceRoutines.txt', '.readthedocs.yml', 'uncrustify.cfg',
-                   'requirements.txt']
+                   'requirements.txt', 'mosquitto_passwd' ]
     if file in files_names:
         return True
     if 'scripts' in root and (file == 'cpplint.py' or file == 'pdi-pep8.py' or file == 'uncrustify.cfg' \
diff --git a/test/functionalTest/cases/3001_mqtt/mqtt_notification.test b/test/functionalTest/cases/3001_mqtt/mqtt_notification.test
index 8e60fee1e6..52377cd61e 100644
--- a/test/functionalTest/cases/3001_mqtt/mqtt_notification.test
+++ b/test/functionalTest/cases/3001_mqtt/mqtt_notification.test
@@ -35,7 +35,7 @@ accumulatorStart --pretty-print --mqttHost ${MQTT_HOST} --mqttPort ${MQTT_PORT}
 #
 # Hint: use this to run the MQTT broker needed for this .test:
 #
-#   docker run -d -p 1883:1883 eclipse-mosquitto:1.6.7
+#   docker run -d -p 1883:1883 -v /path/to/repo/test/functionalTest/mosquittoConf:/mosquitto/config:ro eclipse-mosquitto:2.0.11
 #
 # 01. Create MQTT sub for entity E with topic sub1
 # 02. Create MQTT sub for entity E with topic sub2
diff --git a/test/functionalTest/cases/3001_mqtt/mqtt_notification_custom.test b/test/functionalTest/cases/3001_mqtt/mqtt_notification_custom.test
index ecc29badba..844c37c5be 100644
--- a/test/functionalTest/cases/3001_mqtt/mqtt_notification_custom.test
+++ b/test/functionalTest/cases/3001_mqtt/mqtt_notification_custom.test
@@ -35,7 +35,7 @@ accumulatorStart --pretty-print --mqttHost ${MQTT_HOST} --mqttPort ${MQTT_PORT}
 #
 # Hint: use this to run the MQTT broker needed for this .test:
 #
-#   docker run -d -p 1883:1883 eclipse-mosquitto:1.6.7
+#   docker run -d -p 1883:1883 -v /path/to/repo/test/functionalTest/mosquittoConf:/mosquitto/config:ro eclipse-mosquitto:2.0.11
 #
 # 01. Create MQTT custom sub for entity E with topic sub/{$id} payload A:{$A}
 # 02. Create entity E1 with A=1
diff --git a/test/functionalTest/cases/3001_mqtt/mqtt_notification_qos.test b/test/functionalTest/cases/3001_mqtt/mqtt_notification_qos.test
index a0adbcf1f6..4316fc7cc8 100644
--- a/test/functionalTest/cases/3001_mqtt/mqtt_notification_qos.test
+++ b/test/functionalTest/cases/3001_mqtt/mqtt_notification_qos.test
@@ -35,7 +35,7 @@ accumulatorStart --pretty-print --mqttHost ${MQTT_HOST} --mqttPort ${MQTT_PORT}
 #
 # Hint: use this to run the MQTT broker needed for this .test:
 #
-#   docker run -d -p 1883:1883 eclipse-mosquitto:1.6.7
+#   docker run -d -p 1883:1883 -v /path/to/repo/test/functionalTest/mosquittoConf:/mosquitto/config:ro eclipse-mosquitto:2.0.11
 #
 # 01. Create MQTT sub for entity E with topic sub0 and qos=0
 # 02. Create MQTT sub for entity E with topic sub1 and qos=1
diff --git a/test/functionalTest/cases/3001_mqtt/mqtt_subscription_multibroker.test b/test/functionalTest/cases/3001_mqtt/mqtt_subscription_multibroker.test
index a63f157e54..f8ca62e270 100644
--- a/test/functionalTest/cases/3001_mqtt/mqtt_subscription_multibroker.test
+++ b/test/functionalTest/cases/3001_mqtt/mqtt_subscription_multibroker.test
@@ -35,8 +35,8 @@ accumulatorStart --pretty-print --mqttHost ${MQTT_HOST} --mqttPort ${MQTT_PORT}
 #
 # Hint: use this to run the MQTT brokers needed for this .test:
 #
-#   docker run -d -p 1883:1883 eclipse-mosquitto:1.6.7
-#   docker run -d -p 1884:1883 eclipse-mosquitto:1.6.7
+#   docker run -d -p 1883:1883 -v /path/to/repo/test/functionalTest/mosquittoConf:/mosquitto/config:ro eclipse-mosquitto:2.0.11
+#   docker run -d -p 1884:1883 -v /path/to/repo/test/functionalTest/mosquittoConf:/mosquitto/config:ro eclipse-mosquitto:2.0.11
 #
 # 01. Create MQTT sub1 at localhost:1883 (1)
 # 02. Create MQTT sub2 at localhost:1883 (2)
diff --git a/test/functionalTest/cases/3001_mqtt/subscribe_and_update.test b/test/functionalTest/cases/3001_mqtt/subscribe_and_update.test
index 979feb7bdf..72f4863cf0 100644
--- a/test/functionalTest/cases/3001_mqtt/subscribe_and_update.test
+++ b/test/functionalTest/cases/3001_mqtt/subscribe_and_update.test
@@ -35,7 +35,7 @@ accumulatorStart --pretty-print --mqttHost ${MQTT_HOST} --mqttPort ${MQTT_PORT}
 #
 # Hint: use this to run the MQTT broker needed for this .test:
 #
-#   docker run -d -p 1883:1883 eclipse-mosquitto:1.6.7
+#   docker run -d -p 1883:1883 -v /path/to/repo/test/functionalTest/mosquittoConf:/mosquitto/config:ro eclipse-mosquitto:2.0.11
 #
 # 01. POST /v2/entities, creating E1/T1
 # 02. Subscribe to E1 on condition A2
diff --git a/test/functionalTest/cases/3001_mqtt_alarms/mqtt_alarms_log_summary.test b/test/functionalTest/cases/3001_mqtt_alarms/mqtt_alarms_log_summary.test
index 8f85a26087..d172a45782 100644
--- a/test/functionalTest/cases/3001_mqtt_alarms/mqtt_alarms_log_summary.test
+++ b/test/functionalTest/cases/3001_mqtt_alarms/mqtt_alarms_log_summary.test
@@ -32,8 +32,7 @@ brokerStart CB 0 IPv4 -logSummary 5
 --SHELL--
 
 #
-# FIXME: this test relies on an external service (mqtt.flespi.io) which we don't control
-# It would be better to use a MQTT broker running by us (docker?)
+# This test requires a MQTT broker with authentication enabled. See test/functionalTest/mosquittoConf/README.md
 #
 # 01. Sleep 6 and see 0-0 raised and 0-0 released
 # 02. Create MQTT sub with wrong user/pass
@@ -67,8 +66,8 @@ payload='{
   },
   "notification": {
     "mqtt": {
-      "url": "mqtt://mqtt.flespi.io:1883",
-      "user": "user",
+      "url": "mqtt://localhost:1883",
+      "user": "user_noexist",
       "passwd": "xxxx",
       "topic": "sub1"
     }
@@ -118,8 +117,8 @@ echo "========================================"
 payload='{
   "notification": {
     "mqtt": {
-      "url": "mqtt://mqtt.flespi.io:1883",
-      "user": "SeY7oD5XPa1UENBiOLPHqWXmj4r4OZHu4tsgWn1AmTkQuMW6lCDCmqMvi1oURVfJ",
+      "url": "mqtt://localhost:1883",
+      "user": "user1",
       "passwd": "xxxx",
       "topic": "sub1"
     }
diff --git a/test/functionalTest/cases/3001_mqtt_alarms/mqtt_alarms_none.test b/test/functionalTest/cases/3001_mqtt_alarms/mqtt_alarms_none.test
index 35ee20c7c3..6d25daaf1a 100644
--- a/test/functionalTest/cases/3001_mqtt_alarms/mqtt_alarms_none.test
+++ b/test/functionalTest/cases/3001_mqtt_alarms/mqtt_alarms_none.test
@@ -32,7 +32,7 @@ brokerStart CB 0 IPV4
 #
 # Hint: use this to run the MQTT broker needed for this .test:
 #
-#   docker run -d -p 1883:1883 eclipse-mosquitto:1.6.7
+#   docker run -d -p 1883:1883 -v /path/to/repo/test/functionalTest/mosquittoConf:/mosquitto/config:ro eclipse-mosquitto:2.0.11
 #
 # 01. Create MQTT sub with right enpdoint (localhost:1883)
 # 02. Upsert three times to trigger three MQTT notifications
diff --git a/test/functionalTest/cases/3001_mqtt_alarms/mqtt_alarms_raise_and_release.test b/test/functionalTest/cases/3001_mqtt_alarms/mqtt_alarms_raise_and_release.test
index f531b4247f..8108b226cc 100644
--- a/test/functionalTest/cases/3001_mqtt_alarms/mqtt_alarms_raise_and_release.test
+++ b/test/functionalTest/cases/3001_mqtt_alarms/mqtt_alarms_raise_and_release.test
@@ -30,10 +30,7 @@ brokerStart CB 0 IPV4
 --SHELL--
 
 #
-# FIXME: this test relies on an external service (mqtt.flespi.io) which we don't control
-# It would be better to use a MQTT broker running by us (docker?)
-# Given the MQTT broker is a remote system in the Internet, we have to wait at some points
-# so subscription status and logs get consolidated before checking it
+# This test requires a MQTT broker with authentication enabled. See test/functionalTest/mosquittoConf/README.md
 #
 # 01. Create MQTT sub with wrong user/pass
 # 02. Upsert to trigger first MQTT notification, which fails and raises alarm
@@ -59,8 +56,8 @@ payload='{
   },
   "notification": {
     "mqtt": {
-      "url": "mqtt://mqtt.flespi.io:1883",
-      "user": "user",
+      "url": "mqtt://localhost:1883",
+      "user": "user_noexist",
       "passwd": "xxxx",
       "topic": "sub1"
     }
@@ -91,7 +88,6 @@ echo
 
 echo "03. Get sub and see timesSent:1, failsCounter:1 and lastFailure (but no lastSuccess)"
 echo "===================================================================================="
-sleep 1s
 orionCurl --url /v2/subscriptions
 echo
 echo
@@ -114,7 +110,6 @@ echo
 
 echo "05. Get sub and see timesSent:1, failsCounter:2 and lastFailure (but no lastSuccess)"
 echo "===================================================================================="
-sleep 1s
 orionCurl --url /v2/subscriptions
 echo
 echo
@@ -125,8 +120,8 @@ echo "========================================"
 payload='{
   "notification": {
     "mqtt": {
-      "url": "mqtt://mqtt.flespi.io:1883",
-      "user": "SeY7oD5XPa1UENBiOLPHqWXmj4r4OZHu4tsgWn1AmTkQuMW6lCDCmqMvi1oURVfJ",
+      "url": "mqtt://localhost:1883",
+      "user": "user1",
       "passwd": "xxxx",
       "topic": "sub1"
     }
@@ -154,7 +149,6 @@ echo
 
 echo "08. Get sub and see timesSent:3, lastFailure (old) and lastSuccess but not failsCounter"
 echo "======================================================================================="
-sleep 1s
 orionCurl --url /v2/subscriptions
 echo
 echo
@@ -193,7 +187,7 @@ HTTP/1.1 200 OK
 Date: REGEX(.*)
 Fiware-Correlator: REGEX([0-9a-f\-]{36})
 Content-Type: application/json
-Content-Length: 482
+Content-Length: 485
 
 [
     {
@@ -210,8 +204,8 @@ Content-Length: 482
                 "qos": 0,
                 "retain": false,
                 "topic": "sub1",
-                "url": "mqtt://mqtt.flespi.io:1883",
-                "user": "user"
+                "url": "mqtt://localhost:1883",
+                "user": "user_noexist"
             },
             "onlyChangedAttrs": false,
             "timesSent": 1
@@ -248,7 +242,7 @@ HTTP/1.1 200 OK
 Date: REGEX(.*)
 Fiware-Correlator: REGEX([0-9a-f\-]{36})
 Content-Type: application/json
-Content-Length: 482
+Content-Length: 485
 
 [
     {
@@ -265,8 +259,8 @@ Content-Length: 482
                 "qos": 0,
                 "retain": false,
                 "topic": "sub1",
-                "url": "mqtt://mqtt.flespi.io:1883",
-                "user": "user"
+                "url": "mqtt://localhost:1883",
+                "user": "user_noexist"
             },
             "onlyChangedAttrs": false,
             "timesSent": 2
@@ -311,7 +305,7 @@ HTTP/1.1 200 OK
 Date: REGEX(.*)
 Fiware-Correlator: REGEX([0-9a-f\-]{36})
 Content-Type: application/json
-Content-Length: 566
+Content-Length: 502
 
 [
     {
@@ -328,8 +322,8 @@ Content-Length: 566
                 "qos": 0,
                 "retain": false,
                 "topic": "sub1",
-                "url": "mqtt://mqtt.flespi.io:1883",
-                "user": "SeY7oD5XPa1UENBiOLPHqWXmj4r4OZHu4tsgWn1AmTkQuMW6lCDCmqMvi1oURVfJ"
+                "url": "mqtt://localhost:1883",
+                "user": "user1"
             },
             "onlyChangedAttrs": false,
             "timesSent": 3
@@ -354,16 +348,16 @@ Content-Length: 566
 09. Check logs and see 1 raised alarm and 1 released alarm
 ==========================================================
 #SORT_START
-Request received: POST /v2/subscriptions, request payload (181 bytes): { "subject": { "entities": [ { "id": "E", "type": "T" } ] }, "notification": { "mqtt": { "url": "mqtt://mqtt.flespi.io:1883", "user": "user", "passwd": "xxxx", "topic": "sub1" } } }, response code: 201
+Request received: POST /v2/subscriptions, request payload (184 bytes): { "subject": { "entities": [ { "id": "E", "type": "T" } ] }, "notification": { "mqtt": { "url": "mqtt://localhost:1883", "user": "user_noexist", "passwd": "xxxx", "topic": "sub1" } } }, response code: 201
 Request received: POST /v2/entities?options=forcedUpdate,upsert, request payload (64 bytes): { "id": "E", "type": "T", "A": { "value": 1, "type": "Float" } }, response code: 204
-Raising alarm MqttConnectionError mqtt.flespi.io:1883: Connection Refused: bad user name or password.
+Raising alarm MqttConnectionError localhost:1883: Connection Refused: not authorised.
 Request received: GET /v2/subscriptions, response code: 200
 Request received: POST /v2/entities?options=forcedUpdate,upsert, request payload (64 bytes): { "id": "E", "type": "T", "A": { "value": 1, "type": "Float" } }, response code: 204
 Request received: GET /v2/subscriptions, response code: 200
-Request received: PATCH /v2/subscriptions/SUB_ID, request payload (182 bytes): { "notification": { "mqtt": { "url": "mqtt://mqtt.flespi.io:1883", "user": "SeY7oD5XPa1UENBiOLPHqWXmj4r4OZHu4tsgWn1AmTkQuMW6lCDCmqMvi1oURVfJ", "passwd": "xxxx", "topic": "sub1" } } }, response code: 204
+Request received: PATCH /v2/subscriptions/SUB_ID, request payload (118 bytes): { "notification": { "mqtt": { "url": "mqtt://localhost:1883", "user": "user1", "passwd": "xxxx", "topic": "sub1" } } }, response code: 204
 Request received: POST /v2/entities?options=forcedUpdate,upsert, request payload (64 bytes): { "id": "E", "type": "T", "A": { "value": 1, "type": "Float" } }, response code: 204
-Releasing alarm MqttConnectionError mqtt.flespi.io:1883
-MQTT Notif delivered (subId: SUB_ID): broker: mqtt.flespi.io:1883, topic: sub1, payload (121 bytes): {"subscriptionId":"SUB_ID","data":[{"id":"E","type":"T","A":{"type":"Float","value":1,"metadata":{}}}]}
+Releasing alarm MqttConnectionError localhost:1883
+MQTT Notif delivered (subId: SUB_ID): broker: localhost:1883, topic: sub1, payload (121 bytes): {"subscriptionId":"SUB_ID","data":[{"id":"E","type":"T","A":{"type":"Float","value":1,"metadata":{}}}]}
 Request received: GET /v2/subscriptions, response code: 200
 #SORT_END
 
diff --git a/test/functionalTest/cases/3001_mqtt_alarms/mqtt_alarms_raise_repeat_and_release.test b/test/functionalTest/cases/3001_mqtt_alarms/mqtt_alarms_raise_repeat_and_release.test
index c60bf280d5..8e077ed571 100644
--- a/test/functionalTest/cases/3001_mqtt_alarms/mqtt_alarms_raise_repeat_and_release.test
+++ b/test/functionalTest/cases/3001_mqtt_alarms/mqtt_alarms_raise_repeat_and_release.test
@@ -30,10 +30,7 @@ brokerStart CB 0 IPV4 -relogAlarms
 --SHELL--
 
 #
-# FIXME: this test relies on an external service (mqtt.flespi.io) which we don't control
-# It would be better to use a MQTT broker running by us (docker?)
-# Given the MQTT broker is a remote system in the Internet, we have to wait at some points
-# so subscription status and logs get consolidated before checking it
+# This test requires a MQTT broker with authentication enabled. See test/functionalTest/mosquittoConf/README.md
 #
 # 01. Create MQTT sub with wrong user/pass
 # 02. Upsert to trigger first MQTT notification, which fails and raises alarm
@@ -59,8 +56,8 @@ payload='{
   },
   "notification": {
     "mqtt": {
-      "url": "mqtt://mqtt.flespi.io:1883",
-      "user": "user",
+      "url": "mqtt://localhost:1883",
+      "user": "user_noexist",
       "passwd": "xxxx",
       "topic": "sub1"
     }
@@ -91,7 +88,6 @@ echo
 
 echo "03. Get sub and see timesSent:1, failsCounter:1 and lastFailure (but no lastSuccess)"
 echo "===================================================================================="
-sleep 1s
 orionCurl --url /v2/subscriptions
 echo
 echo
@@ -114,7 +110,6 @@ echo
 
 echo "05. Get sub and see timesSent:1, failsCounter:2 and lastFailure (but no lastSuccess)"
 echo "===================================================================================="
-sleep 1s
 orionCurl --url /v2/subscriptions
 echo
 echo
@@ -125,8 +120,8 @@ echo "========================================"
 payload='{
   "notification": {
     "mqtt": {
-      "url": "mqtt://mqtt.flespi.io:1883",
-      "user": "SeY7oD5XPa1UENBiOLPHqWXmj4r4OZHu4tsgWn1AmTkQuMW6lCDCmqMvi1oURVfJ",
+      "url": "mqtt://localhost:1883",
+      "user": "user1",
       "passwd": "xxxx",
       "topic": "sub1"
     }
@@ -154,7 +149,6 @@ echo
 
 echo "08. Get sub and see timesSent:3, lastFailure (old) and lastSuccess but not failsCounter"
 echo "======================================================================================="
-sleep 1s
 orionCurl --url /v2/subscriptions
 echo
 echo
@@ -193,7 +187,7 @@ HTTP/1.1 200 OK
 Date: REGEX(.*)
 Fiware-Correlator: REGEX([0-9a-f\-]{36})
 Content-Type: application/json
-Content-Length: 482
+Content-Length: 485
 
 [
     {
@@ -210,8 +204,8 @@ Content-Length: 482
                 "qos": 0,
                 "retain": false,
                 "topic": "sub1",
-                "url": "mqtt://mqtt.flespi.io:1883",
-                "user": "user"
+                "url": "mqtt://localhost:1883",
+                "user": "user_noexist"
             },
             "onlyChangedAttrs": false,
             "timesSent": 1
@@ -248,7 +242,7 @@ HTTP/1.1 200 OK
 Date: REGEX(.*)
 Fiware-Correlator: REGEX([0-9a-f\-]{36})
 Content-Type: application/json
-Content-Length: 482
+Content-Length: 485
 
 [
     {
@@ -265,8 +259,8 @@ Content-Length: 482
                 "qos": 0,
                 "retain": false,
                 "topic": "sub1",
-                "url": "mqtt://mqtt.flespi.io:1883",
-                "user": "user"
+                "url": "mqtt://localhost:1883",
+                "user": "user_noexist"
             },
             "onlyChangedAttrs": false,
             "timesSent": 2
@@ -311,7 +305,7 @@ HTTP/1.1 200 OK
 Date: REGEX(.*)
 Fiware-Correlator: REGEX([0-9a-f\-]{36})
 Content-Type: application/json
-Content-Length: 566
+Content-Length: 502
 
 [
     {
@@ -328,8 +322,8 @@ Content-Length: 566
                 "qos": 0,
                 "retain": false,
                 "topic": "sub1",
-                "url": "mqtt://mqtt.flespi.io:1883",
-                "user": "SeY7oD5XPa1UENBiOLPHqWXmj4r4OZHu4tsgWn1AmTkQuMW6lCDCmqMvi1oURVfJ"
+                "url": "mqtt://localhost:1883",
+                "user": "user1"
             },
             "onlyChangedAttrs": false,
             "timesSent": 3
@@ -354,17 +348,17 @@ Content-Length: 566
 09. Check logs and see 1 raised alarm, 1 repeat alarm and 1 released alarm
 ==========================================================================
 #SORT_START
-Request received: POST /v2/subscriptions, request payload (181 bytes): { "subject": { "entities": [ { "id": "E", "type": "T" } ] }, "notification": { "mqtt": { "url": "mqtt://mqtt.flespi.io:1883", "user": "user", "passwd": "xxxx", "topic": "sub1" } } }, response code: 201
+Request received: POST /v2/subscriptions, request payload (184 bytes): { "subject": { "entities": [ { "id": "E", "type": "T" } ] }, "notification": { "mqtt": { "url": "mqtt://localhost:1883", "user": "user_noexist", "passwd": "xxxx", "topic": "sub1" } } }, response code: 201
 Request received: POST /v2/entities?options=forcedUpdate,upsert, request payload (64 bytes): { "id": "E", "type": "T", "A": { "value": 1, "type": "Float" } }, response code: 204
-Raising alarm MqttConnectionError mqtt.flespi.io:1883: Connection Refused: bad user name or password.
+Raising alarm MqttConnectionError localhost:1883: Connection Refused: not authorised.
 Request received: GET /v2/subscriptions, response code: 200
 Request received: POST /v2/entities?options=forcedUpdate,upsert, request payload (64 bytes): { "id": "E", "type": "T", "A": { "value": 1, "type": "Float" } }, response code: 204
 Request received: GET /v2/subscriptions, response code: 200
-Repeated MqttConnectionError mqtt.flespi.io:1883: Connection Refused: bad user name or password.
-Request received: PATCH /v2/subscriptions/SUB_ID, request payload (182 bytes): { "notification": { "mqtt": { "url": "mqtt://mqtt.flespi.io:1883", "user": "SeY7oD5XPa1UENBiOLPHqWXmj4r4OZHu4tsgWn1AmTkQuMW6lCDCmqMvi1oURVfJ", "passwd": "xxxx", "topic": "sub1" } } }, response code: 204
+Repeated MqttConnectionError localhost:1883: Connection Refused: not authorised.
+Request received: PATCH /v2/subscriptions/SUB_ID, request payload (118 bytes): { "notification": { "mqtt": { "url": "mqtt://localhost:1883", "user": "user1", "passwd": "xxxx", "topic": "sub1" } } }, response code: 204
 Request received: POST /v2/entities?options=forcedUpdate,upsert, request payload (64 bytes): { "id": "E", "type": "T", "A": { "value": 1, "type": "Float" } }, response code: 204
-Releasing alarm MqttConnectionError mqtt.flespi.io:1883
-MQTT Notif delivered (subId: SUB_ID): broker: mqtt.flespi.io:1883, topic: sub1, payload (121 bytes): {"subscriptionId":"SUB_ID","data":[{"id":"E","type":"T","A":{"type":"Float","value":1,"metadata":{}}}]}
+Releasing alarm MqttConnectionError localhost:1883
+MQTT Notif delivered (subId: SUB_ID): broker: localhost:1883, topic: sub1, payload (121 bytes): {"subscriptionId":"SUB_ID","data":[{"id":"E","type":"T","A":{"type":"Float","value":1,"metadata":{}}}]}
 Request received: GET /v2/subscriptions, response code: 200
 #SORT_END
 
diff --git a/test/functionalTest/mosquittoConf/README.md b/test/functionalTest/mosquittoConf/README.md
new file mode 100644
index 0000000000..9b4c01410c
--- /dev/null
+++ b/test/functionalTest/mosquittoConf/README.md
@@ -0,0 +1,21 @@
+This directory contains some configuration files, to be used (mounting a volume) by mosquitto docker containers. See functional.yml (and some other GitActions) for an example on how they are used.
+
+The `mosquitto_passwd` file containts a harmless credential: `user1` with password `xxxx`, used in `cases/3001_mqtt_alarms` tests. The password file works for mosquitto 2.0 version but other versions (specifically, 1.6) could not recognize its format.
+
+This files can be also being used in a local mosquitto instance. For instance
+
+```
+$ sudo cp /path/to/repo/test/functionalTest/mosquittoConf/mosquitto.conf /etc/mosquitto/conf.d/local.conf
+$ # edit the /etc/mosquitto/conf.d/local.conf file to change the password_file location to /etc/mosquitto/passwd
+$ sudo cp /path/to/repo/test/functionalTest/mosquittoConf/mosquitto_passwd /etc/mosquitto/passwd
+$ sudo chmod 640 /etc/mosquitto/passwd
+$ sudo chown root:mosquitto /etc/mosquitto/passwd
+```
+
+Alternativelly you can add users to password file using a command like this one:
+
+```
+$ sudo mosquitto_passwd -c /etc/mosquitto/passwd user1
+```
+
+
diff --git a/test/functionalTest/mosquittoConf/mosquitto.conf b/test/functionalTest/mosquittoConf/mosquitto.conf
new file mode 100644
index 0000000000..9d5d46d789
--- /dev/null
+++ b/test/functionalTest/mosquittoConf/mosquitto.conf
@@ -0,0 +1,23 @@
+# Copyright 2025 Telefonica Investigacion y Desarrollo, S.A.U
+#
+# This file is part of Orion Context Broker.
+#
+# Orion Context Broker is free software: you can redistribute it and/or
+# modify it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# Orion Context Broker is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero
+# General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with Orion Context Broker. If not, see http://www.gnu.org/licenses/.
+#
+# For those usages not covered by this license please contact with
+# iot_support at tid dot es
+
+password_file /mosquitto/config/mosquitto_passwd
+allow_anonymous true
+listener 1883 0.0.0.0
diff --git a/test/functionalTest/mosquittoConf/mosquitto_passwd b/test/functionalTest/mosquittoConf/mosquitto_passwd
new file mode 100644
index 0000000000..eb65166dae
--- /dev/null
+++ b/test/functionalTest/mosquittoConf/mosquitto_passwd
@@ -0,0 +1 @@
+user1:$7$101$eqgU7wUvh4Y3VQAm$ovEPI43qOwAskK5M+OFmNJAoXtLRx5GI2tBjTX4AOf3ZTB79IRv1CMgbHrPnKY+/K/RKMm2i/XFp9syteeOCvg==