diff --git a/components/extensions/mb-extensions/org.wso2.carbon.andes.extensions.device.mgt.api/src/main/java/org/wso2/carbon/andes/extensions/device/mgt/jaxrs/util/MQTTMgtAPIUtils.java b/components/extensions/mb-extensions/org.wso2.carbon.andes.extensions.device.mgt.api/src/main/java/org/wso2/carbon/andes/extensions/device/mgt/jaxrs/util/MQTTMgtAPIUtils.java
new file mode 100644
index 000000000..08951f00f
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+++ b/components/extensions/mb-extensions/org.wso2.carbon.andes.extensions.device.mgt.api/src/main/java/org/wso2/carbon/andes/extensions/device/mgt/jaxrs/util/MQTTMgtAPIUtils.java
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
+ *
+ * WSO2 Inc. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.wso2.carbon.andes.extensions.device.mgt.jaxrs.util;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.wso2.carbon.andes.extensions.device.mgt.jaxrs.beans.ErrorResponse;
+import org.wso2.carbon.context.CarbonContext;
+import org.wso2.carbon.context.PrivilegedCarbonContext;
+//import org.wso2.carbon.device.mgt.analytics.dashboard.GadgetDataService;
+import org.wso2.carbon.device.mgt.common.DeviceManagementException;
+import org.wso2.carbon.device.mgt.common.authorization.DeviceAccessAuthorizationService;
+import org.wso2.carbon.device.mgt.common.configuration.mgt.ConfigurationEntry;
+import org.wso2.carbon.device.mgt.common.configuration.mgt.PlatformConfiguration;
+import org.wso2.carbon.device.mgt.common.configuration.mgt.PlatformConfigurationManagementService;
+import org.wso2.carbon.device.mgt.common.notification.mgt.NotificationManagementService;
+import org.wso2.carbon.device.mgt.common.scope.mgt.ScopeManagementService;
+import org.wso2.carbon.device.mgt.core.app.mgt.ApplicationManagementProviderService;
+import org.wso2.carbon.device.mgt.core.device.details.mgt.DeviceInformationManager;
+import org.wso2.carbon.device.mgt.core.search.mgt.SearchManagerService;
+import org.wso2.carbon.device.mgt.core.service.DeviceManagementProviderService;
+import org.wso2.carbon.device.mgt.core.service.GroupManagementProviderService;
+import org.wso2.carbon.andes.extensions.device.mgt.jaxrs.service.impl.util.InputValidationException;
+import org.wso2.carbon.policy.mgt.core.PolicyManagerService;
+import org.wso2.carbon.user.api.AuthorizationManager;
+import org.wso2.carbon.user.api.UserRealm;
+import org.wso2.carbon.user.api.UserStoreException;
+import org.wso2.carbon.user.api.UserStoreManager;
+import org.wso2.carbon.user.core.service.RealmService;
+
+import javax.ws.rs.core.MediaType;
+import java.util.List;
+
+/**
+ * MDMAPIUtils class provides utility function used by CDM REST-API classes.
+ */
+public class MQTTMgtAPIUtils {
+
+    public static final MediaType DEFAULT_CONTENT_TYPE = MediaType.APPLICATION_JSON_TYPE;
+    private static final String NOTIFIER_FREQUENCY = "notifierFrequency";
+    private static Log log = LogFactory.getLog(MQTTMgtAPIUtils.class);
+
+    public static RealmService getRealmService() throws UserStoreException {
+        RealmService realmService;
+        PrivilegedCarbonContext ctx = PrivilegedCarbonContext.getThreadLocalCarbonContext();
+        realmService = (RealmService) ctx.getOSGiService(RealmService.class, null);
+        if (realmService == null) {
+            String msg = "Realm service has not initialized.";
+            log.error(msg);
+            throw new IllegalStateException(msg);
+        }
+        return realmService;
+    }
+
+    /**
+     * Getting the current tenant's user realm
+     */
+    public static UserRealm getUserRealm() throws UserStoreException {
+        RealmService realmService;
+        UserRealm realm;
+        PrivilegedCarbonContext ctx = PrivilegedCarbonContext.getThreadLocalCarbonContext();
+        realmService = (RealmService) ctx.getOSGiService(RealmService.class, null);
+
+        if (realmService == null) {
+            throw new IllegalStateException("Realm service not initialized");
+        }
+        int tenantId = CarbonContext.getThreadLocalCarbonContext().getTenantId();
+        realm = realmService.getTenantUserRealm(tenantId);
+        return realm;
+    }
+
+    public static AuthorizationManager getAuthorizationManager() throws UserStoreException {
+        RealmService realmService;
+        AuthorizationManager authorizationManager;
+        PrivilegedCarbonContext ctx = PrivilegedCarbonContext.getThreadLocalCarbonContext();
+        realmService = (RealmService) ctx.getOSGiService(RealmService.class, null);
+        if (realmService == null) {
+            throw new IllegalStateException("Realm service is not initialized.");
+        }
+        int tenantId = ctx.getTenantId();
+        authorizationManager = realmService.getTenantUserRealm(tenantId).getAuthorizationManager();
+
+        return authorizationManager;
+    }
+
+    public static ScopeManagementService getScopeManagementService() {
+        PrivilegedCarbonContext ctx = PrivilegedCarbonContext.getThreadLocalCarbonContext();
+        ScopeManagementService scopeManagementService =
+                (ScopeManagementService) ctx.getOSGiService(ScopeManagementService.class, null);
+        if (scopeManagementService == null) {
+            throw new IllegalStateException("Scope Management Service has not been initialized.");
+        }
+        return scopeManagementService;
+    }
+
+    public static int getTenantId(String tenantDomain) throws DeviceManagementException {
+        RealmService realmService =
+                (RealmService) PrivilegedCarbonContext.getThreadLocalCarbonContext().getOSGiService(RealmService.class, null);
+        if (realmService == null) {
+            throw new IllegalStateException("Realm service has not been initialized.");
+        }
+        try {
+            return realmService.getTenantManager().getTenantId(tenantDomain);
+        } catch (UserStoreException e) {
+            throw new DeviceManagementException("Error occured while trying to " +
+                "obtain tenant id of currently logged in user");
+        }
+    }
+
+    public static String getAuthenticatedUser() {
+        PrivilegedCarbonContext threadLocalCarbonContext = PrivilegedCarbonContext.getThreadLocalCarbonContext();
+        String username = threadLocalCarbonContext.getUsername();
+        String tenantDomain = threadLocalCarbonContext.getTenantDomain();
+        if (username != null && username.endsWith(tenantDomain)) {
+            return username.substring(0, username.lastIndexOf("@"));
+        }
+        return username;
+    }
+
+}