diff --git a/src/config.xml b/src/config.xml
index 97941c0..7b7b693 100644
--- a/src/config.xml
+++ b/src/config.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='UTF-8'?>
-<operator xmlns="http://wirecloud.conwet.fi.upm.es/ns/macdescription/1" vendor="CoNWeT" name="ngsi-source" version="4.2.0rc1">
+<operator xmlns="http://wirecloud.conwet.fi.upm.es/ns/macdescription/1" vendor="CoNWeT" name="ngsi-source" version="4.2.0rc2">
     <details>
         <title>NGSI source</title>
         <homepage>https://github.com/wirecloud-fiware/ngsi-source</homepage>
@@ -72,6 +72,18 @@
             label="Query"
             description="Filter entities by providing a query using the Simple Query Language."
             default="" />
+        <preference
+            name="ngsi_attributes"
+            type="text"
+            label="Requested Attributes"
+            description="A comma separated list of attribute names or the `*` wildcard. Use `*` or an empty value to request all attributes except the builtin ones (`dateCreated`, `dateModified`, ...)."
+            default="*" />
+        <preference
+            name="ngsi_metadata"
+            type="text"
+            label="Requested Metadata"
+            description="A comma separated list of attribute metadata names or the `*` wildcard. Use `*` or an empty value to request all attribute matadata except the builtin ones (`dateCreated`, `dateModified`, ...)."
+            default="*" />
         <preference
             name="ngsi_update_attributes"
             type="text"
diff --git a/src/doc/changelog.es.md b/src/doc/changelog.es.md
index 944d8d7..5f62c77 100644
--- a/src/doc/changelog.es.md
+++ b/src/doc/changelog.es.md
@@ -8,6 +8,8 @@
 - Añadida la opción de subscribirse a los cambios en cualquiera de los
   atributos mediante el uso de comodín `*` en la preferencia **Monitored NGSI
   Attributes**.
+- Soporte para poder configurar que atributos y que metadatos van a ser pedidos
+  al context broker.
 
 
 ## v4.0.0 (2017-12-07)
diff --git a/src/doc/changelog.md b/src/doc/changelog.md
index d9ef0f9..cdd5699 100644
--- a/src/doc/changelog.md
+++ b/src/doc/changelog.md
@@ -7,6 +7,8 @@
   to take effect.
 - Allow to monitor all entity attributes by providing the `*` value on the
   **Monitored NGSI Attributes** setting.
+- Allow to configure what attributes and metadata values are going to be
+  requested to the context broker.
 
 
 ## v4.0.0 (2017-12-07)
diff --git a/src/doc/userguide.md b/src/doc/userguide.md
index 52d280b..c5f182e 100644
--- a/src/doc/userguide.md
+++ b/src/doc/userguide.md
@@ -35,13 +35,16 @@ Settings
   empty, in that case, entities won't be filtered by id.
 - **Query:** Filter entities by providing a query using the Simple Query
   Language.
+- **Requested Attributes:** A comma separated list of attribute names or the `*`
+  wildcard. Use `*` or an empty value to request all attributes except the
+  builtin ones (`dateCreated`, `dateModified`, ...).
+- **Requested Metadata:** A comma separated list of attribute metadata names or
+  the `*` wildcard. Use `*` or an empty value to request all attribute matadata
+  except the builtin ones (`dateCreated`, `dateModified`, ...).
 - **Monitored NGSI Attributes:** Attributes to monitor for updates. Those
   changes are tracked by creating a subscription inside the context broker. If
   this list is empty, that subscription won't be created. Use `*` to subscribe
   to changes on any attribute.
-- **attributes format ('keyValues', 'normalized' or 'values'):** Specifies how
-  the entities are represented in notifications. Accepted values are 'normalized'
-  (default), 'keyValues' or 'values'.
 
 
 Wiring
diff --git a/src/js/main.js b/src/js/main.js
index 5667d9a..c3df4ce 100644
--- a/src/js/main.js
+++ b/src/js/main.js
@@ -25,9 +25,9 @@
     /* ******************************** PRIVATE ************************************/
     /* *****************************************************************************/
 
-    const doInitialQueries = function doInitialQueries(idPattern, types, filter) {
+    const doInitialQueries = function doInitialQueries(idPattern, types, filter, attributes, metadata) {
         const attrsFormat = MashupPlatform.operator.outputs.normalizedOutput.connected ? "normalized" : "keyValues";
-        this.query_task = requestInitialData.call(this, idPattern, types, filter, attrsFormat, 0);
+        this.query_task = requestInitialData.call(this, idPattern, types, filter, attributes, metadata, attrsFormat, 0);
     };
 
     const refreshNGSISubscription = function refreshNGSISubscription() {
@@ -103,19 +103,33 @@
             id_pattern = '.*';
         }
 
+        // Filter using the Simple Query Language supported by NGSIv2
         let filter = MashupPlatform.prefs.get('query').trim();
-        let attrs = MashupPlatform.prefs.get('ngsi_update_attributes').trim();
-        if (filter === '') {
+        if (filter === "") {
             filter = undefined;
         }
 
+        // Filter entity attributes
+        let attributes = MashupPlatform.prefs.get("ngsi_attributes").trim();
+        if (attributes === "" || attributes === "*") {
+            attributes = undefined;
+        }
+
+        // Filter attribute metadata
+        let metadata = MashupPlatform.prefs.get("ngsi_metadata").trim();
+        if (metadata === "" || metadata === "*") {
+            metadata = undefined;
+        }
+
+        // Monitored attributes
+        let monitored_attrs = MashupPlatform.prefs.get('ngsi_update_attributes').trim();
         let condition = undefined;
-        if (filter != null || attrs !== "") {
+        if (filter != null || monitored_attrs !== "") {
             condition = {};
         }
-        if (attrs !== "") {
-            attrs = attrs.split(/,\s*/);
-            condition.attrs = attrs.includes("*") ? [] : attrs;
+        if (monitored_attrs !== "") {
+            monitored_attrs = monitored_attrs.split(/,\s*/);
+            condition.attrs = monitored_attrs.includes("*") ? [] : monitored_attrs;
         }
         if (filter != null) {
             condition.expression = {
@@ -123,8 +137,8 @@
             };
         }
 
-        if (attrs === "") {
-            doInitialQueries.call(this, id_pattern, types, filter);
+        if (monitored_attrs === "") {
+            doInitialQueries.call(this, id_pattern, types, filter, attributes, metadata);
         } else {
             let entities = [];
             if (types != null) {
@@ -146,6 +160,8 @@
                     condition: condition
                 },
                 notification: {
+                    attrs: attributes != null ? attributes.split(/,\s*/) : undefined,
+                    metadata: metadata != null ? metadata.split(/,\s*/) : undefined,
                     attrsFormat: attrsFormat,
                     callback: (notification) => {
                         handlerReceiveEntities.call(this, attrsFormat, notification.data);
@@ -159,7 +175,7 @@
                     MashupPlatform.operator.log("Subscription created successfully (id: " + response.subscription.id + ")", MashupPlatform.log.INFO);
                     this.subscriptionId = response.subscription.id;
                     this.refresh_interval = setInterval(refreshNGSISubscription.bind(this), 1000 * 60 * 60 * 2);  // each 2 hours
-                    doInitialQueries.call(this, id_pattern, types, filter);
+                    doInitialQueries.call(this, id_pattern, types, filter, attributes, metadata);
                 },
                 (e) => {
                     if (e instanceof NGSI.ProxyConnectionError) {
@@ -172,7 +188,7 @@
         }
     };
 
-    const requestInitialData = function requestInitialData(idPattern, types, filter, attrsFormat, page) {
+    const requestInitialData = function requestInitialData(idPattern, types, filter, attributes, metadata, attrsFormat, page) {
         return this.connection.v2.listEntities(
             {
                 idPattern: idPattern,
@@ -181,13 +197,15 @@
                 keyValues: attrsFormat === "keyValues",
                 limit: 100,
                 offset: page * 100,
-                q: filter
+                q: filter,
+                attrs: attributes,
+                metadata: metadata
             }
         ).then(
             (response) => {
                 handlerReceiveEntities.call(this, attrsFormat, response.results);
                 if (page < 100 && (page + 1) * 100 < response.count) {
-                    return requestInitialData.call(this, idPattern, types, filter, attrsFormat, page + 1);
+                    return requestInitialData.call(this, idPattern, types, filter, attributes, metadata, attrsFormat, page + 1);
                 }
             },
             () => {
diff --git a/tests/js/NGSISourceSpec.js b/tests/js/NGSISourceSpec.js
index e5016b5..f455a75 100644
--- a/tests/js/NGSISourceSpec.js
+++ b/tests/js/NGSISourceSpec.js
@@ -30,12 +30,14 @@
                 type: 'operator',
                 prefs: {
                     'query': '',
+                    'ngsi_attributes': '*',
                     'ngsi_entities': '',
                     'ngsi_id_filter': '',
+                    'ngsi_metadata': '*',
                     'ngsi_proxy': 'https://ngsiproxy.example.com',
                     'ngsi_server': 'https://orion.example.com',
-                    'ngsi_tenant': 'Tenant',
                     'ngsi_service_path': '/Spain/Madrid',
+                    'ngsi_tenant': 'Tenant',
                     'ngsi_update_attributes': '',
                     'use_owner_credentials': false,
                     'use_user_fiware_token': false
@@ -333,6 +335,46 @@
             }, 0);
         });
 
+        it("connect (custom attributes)", (done) => {
+            MashupPlatform.prefs.set('ngsi_attributes', 'speed,location');
+            MashupPlatform.prefs.set('ngsi_update_attributes', 'location');
+            MashupPlatform.operator.outputs.entityOutput.connect(true);
+
+            operator.init();
+
+            setTimeout(() => {
+                // List Entities Options
+                const leo = operator.connection.v2.listEntities.calls.mostRecent().args[0];
+                expect(leo.attrs).toEqual("speed,location");
+
+                // Create Subscription Options
+                const cso = operator.connection.v2.createSubscription.calls.mostRecent().args[0];
+
+                expect(cso.notification.attrs).toEqual(["speed", "location"]);
+                done();
+            });
+        });
+
+        it("connect (custom metadata)", (done) => {
+            MashupPlatform.prefs.set('ngsi_metadata', 'unitCode,timestamp');
+            MashupPlatform.prefs.set('ngsi_update_attributes', 'location');
+            MashupPlatform.operator.outputs.entityOutput.connect(true);
+
+            operator.init();
+
+            setTimeout(() => {
+                // List Entities Options
+                const leo = operator.connection.v2.listEntities.calls.mostRecent().args[0];
+                expect(leo.metadata).toEqual("unitCode,timestamp");
+
+                // Create Subscription Options
+                const cso = operator.connection.v2.createSubscription.calls.mostRecent().args[0];
+
+                expect(cso.notification.metadata).toEqual(["unitCode", "timestamp"]);
+                done();
+            });
+        });
+
         it("connect (types + subscription)", (done) => {
             MashupPlatform.operator.outputs.entityOutput.connect(true);
             MashupPlatform.prefs.set('ngsi_entities', 'AirQualityObserved, WeatherForecast');