/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 *    Copyright 2017-2022 (c) Fraunhofer IOSB (Author: Julius Pfrommer)

 *    Copyright 2017 (c) Stefan Profanter, fortiss GmbH

 *    Copyright 2017 (c) Thomas Bender

 *    Copyright 2017 (c) Julian Grothoff

 *    Copyright 2017 (c) Henrik Norrman

 *    Copyright 2018 (c) Fabian Arndt, Root-Core

 *    Copyright 2019 (c) Kalycito Infotech Private Limited

 *    Copyright 2021 (c) Christian von Arnim, ISW University of Stuttgart (for VDW and umati)

 *    Copyright 2023 (c) Fraunhofer IOSB (Author: Andreas Ebner)

 */

#include "open62541/namespace0_generated.h"

#include "ua_server_internal.h"

#include "ua_session.h"

#include "ua_subscription.h"

static UA_StatusCode

ns0_addNode_raw(UA_Server *server, UA_NodeClass nodeClass,

            UA_UInt32 nodeId, char *name, void *attributes,

            const UA_DataType *attributesType) {

    UA_AddNodesItem item;

    UA_AddNodesItem_init(&item);

    item.nodeClass = nodeClass;

    item.requestedNewNodeId.nodeId = UA_NODEID_NUMERIC(0, nodeId);

    item.browseName = UA_QUALIFIEDNAME(0, name);

    UA_ExtensionObject_setValueNoDelete(&item.nodeAttributes,

                                        attributes, attributesType);

    return addNode_raw(server, &server->adminSession, NULL, &item, NULL);

}

static UA_StatusCode

ns0_addNode_finish(UA_Server *server, UA_UInt32 nodeId,

               UA_UInt32 parentNodeId, UA_UInt32 referenceTypeId) {

    const UA_NodeId sourceId = UA_NODEID_NUMERIC(0, nodeId);

    const UA_NodeId refTypeId = UA_NODEID_NUMERIC(0, referenceTypeId);

    const UA_NodeId targetId = UA_NODEID_NUMERIC(0, parentNodeId);

    UA_StatusCode retval = addRef(server, sourceId, refTypeId, targetId, false);

    if(retval != UA_STATUSCODE_GOOD)

        return retval;

    return addNode_finish(server, &server->adminSession, &sourceId);

}

static UA_StatusCode

addObjectNode(UA_Server *server, char* name, UA_UInt32 objectid,

              UA_UInt32 parentid, UA_UInt32 referenceid, UA_UInt32 type_id) {

    UA_ObjectAttributes object_attr = UA_ObjectAttributes_default;

    object_attr.displayName = UA_LOCALIZEDTEXT("", name);

    return addNode(server, UA_NODECLASS_OBJECT, UA_NODEID_NUMERIC(0, objectid),

                   UA_NODEID_NUMERIC(0, parentid), UA_NODEID_NUMERIC(0, referenceid),

                   UA_QUALIFIEDNAME(0, name), UA_NODEID_NUMERIC(0, type_id),

                   &object_attr, &UA_TYPES[UA_TYPES_OBJECTATTRIBUTES],

                   NULL, NULL);

}

static UA_StatusCode

addReferenceTypeNode(UA_Server *server, char* name, char *inverseName, UA_UInt32 referencetypeid,

                     UA_Boolean isabstract, UA_Boolean symmetric, UA_UInt32 parentid) {

    UA_ReferenceTypeAttributes reference_attr = UA_ReferenceTypeAttributes_default;

    reference_attr.displayName = UA_LOCALIZEDTEXT("", name);

    reference_attr.isAbstract = isabstract;

    reference_attr.symmetric = symmetric;

    if(inverseName)

        reference_attr.inverseName = UA_LOCALIZEDTEXT("", inverseName);

    return addNode(server, UA_NODECLASS_REFERENCETYPE, UA_NODEID_NUMERIC(0, referencetypeid),

                   UA_NODEID_NUMERIC(0, parentid), UA_NODEID_NULL, UA_QUALIFIEDNAME(0, name),

                   UA_NODEID_NULL, &reference_attr,

                   &UA_TYPES[UA_TYPES_REFERENCETYPEATTRIBUTES], NULL, NULL);

}

/***************************/

/* Bootstrap NS0 hierarchy */

/***************************/

/* Creates the basic nodes which are expected by the nodeset compiler to be

 * already created. This is necessary to reduce the dependencies for the nodeset

 * compiler. */

static UA_StatusCode

createNS0_base(UA_Server *server) {

    /* Bootstrap ReferenceTypes. The order of these is important for the

     * ReferenceTypeIndex. The ReferenceTypeIndex is created with the raw node.

     * The ReferenceTypeSet of subtypes for every ReferenceType is created

     * during the call to AddNode_finish. */

    UA_StatusCode ret = UA_STATUSCODE_GOOD;

    UA_ReferenceTypeAttributes references_attr = UA_ReferenceTypeAttributes_default;

    references_attr.displayName = UA_LOCALIZEDTEXT("", "References");

    references_attr.isAbstract = true;

    references_attr.symmetric = true;

    references_attr.inverseName = UA_LOCALIZEDTEXT("", "References");

    ret |= ns0_addNode_raw(server, UA_NODECLASS_REFERENCETYPE, UA_NS0ID_REFERENCES, "References",

                           &references_attr, &UA_TYPES[UA_TYPES_REFERENCETYPEATTRIBUTES]);

    UA_ReferenceTypeAttributes hassubtype_attr = UA_ReferenceTypeAttributes_default;

    hassubtype_attr.displayName = UA_LOCALIZEDTEXT("", "HasSubtype");

    hassubtype_attr.isAbstract = false;

    hassubtype_attr.symmetric = false;

    hassubtype_attr.inverseName = UA_LOCALIZEDTEXT("", "SubtypeOf");

    ret |= ns0_addNode_raw(server, UA_NODECLASS_REFERENCETYPE, UA_NS0ID_HASSUBTYPE, "HasSubtype",

                           &hassubtype_attr, &UA_TYPES[UA_TYPES_REFERENCETYPEATTRIBUTES]);

    UA_ReferenceTypeAttributes aggregates_attr = UA_ReferenceTypeAttributes_default;

    aggregates_attr.displayName = UA_LOCALIZEDTEXT("", "Aggregates");

    aggregates_attr.isAbstract = true;

    aggregates_attr.symmetric = false;

    aggregates_attr.inverseName = UA_LOCALIZEDTEXT("", "AggregatedBy");

    ret |= ns0_addNode_raw(server, UA_NODECLASS_REFERENCETYPE, UA_NS0ID_AGGREGATES, "Aggregates",

                           &aggregates_attr, &UA_TYPES[UA_TYPES_REFERENCETYPEATTRIBUTES]);

    ret |= addReferenceTypeNode(server, "HierarchicalReferences", NULL,

                         UA_NS0ID_HIERARCHICALREFERENCES, true, false, UA_NS0ID_REFERENCES);

    ret |= addReferenceTypeNode(server, "NonHierarchicalReferences", NULL,

                         UA_NS0ID_NONHIERARCHICALREFERENCES, true, true, UA_NS0ID_REFERENCES);

    ret |= addReferenceTypeNode(server, "HasChild", NULL, UA_NS0ID_HASCHILD,

                         true, false, UA_NS0ID_HIERARCHICALREFERENCES);

    ret |= addReferenceTypeNode(server, "Organizes", "OrganizedBy", UA_NS0ID_ORGANIZES,

                         false, false, UA_NS0ID_HIERARCHICALREFERENCES);

    ret |= addReferenceTypeNode(server, "HasEventSource", "EventSourceOf", UA_NS0ID_HASEVENTSOURCE,

                         false, false, UA_NS0ID_HIERARCHICALREFERENCES);

    ret |= addReferenceTypeNode(server, "HasModellingRule", "ModellingRuleOf", UA_NS0ID_HASMODELLINGRULE,

                         false, false, UA_NS0ID_NONHIERARCHICALREFERENCES);

    ret |= addReferenceTypeNode(server, "HasEncoding", "EncodingOf", UA_NS0ID_HASENCODING,

                         false, false, UA_NS0ID_NONHIERARCHICALREFERENCES);

    ret |= addReferenceTypeNode(server, "HasDescription", "DescriptionOf", UA_NS0ID_HASDESCRIPTION,

                         false, false, UA_NS0ID_NONHIERARCHICALREFERENCES);

    ret |= addReferenceTypeNode(server, "HasTypeDefinition", "TypeDefinitionOf", UA_NS0ID_HASTYPEDEFINITION,

                         false, false, UA_NS0ID_NONHIERARCHICALREFERENCES);

    ret |= addReferenceTypeNode(server, "GeneratesEvent", "GeneratedBy", UA_NS0ID_GENERATESEVENT,

                         false, false, UA_NS0ID_NONHIERARCHICALREFERENCES);

    /* Complete bootstrap of Aggregates */

    ret |= ns0_addNode_finish(server, UA_NS0ID_AGGREGATES, UA_NS0ID_HASCHILD, UA_NS0ID_HASSUBTYPE);

    /* Complete bootstrap of HasSubtype */

    ret |= ns0_addNode_finish(server, UA_NS0ID_HASSUBTYPE, UA_NS0ID_HASCHILD, UA_NS0ID_HASSUBTYPE);

    ret |= addReferenceTypeNode(server, "HasProperty", "PropertyOf", UA_NS0ID_HASPROPERTY,

                         false, false, UA_NS0ID_AGGREGATES);

    ret |= addReferenceTypeNode(server, "HasComponent", "ComponentOf", UA_NS0ID_HASCOMPONENT,

                         false, false, UA_NS0ID_AGGREGATES);

    ret |= addReferenceTypeNode(server, "HasNotifier", "NotifierOf", UA_NS0ID_HASNOTIFIER,

                         false, false, UA_NS0ID_HASEVENTSOURCE);

    ret |= addReferenceTypeNode(server, "HasOrderedComponent", "OrderedComponentOf",

                         UA_NS0ID_HASORDEREDCOMPONENT, false, false, UA_NS0ID_HASCOMPONENT);

    ret |= addReferenceTypeNode(server, "HasInterface", "InterfaceOf",

                         UA_NS0ID_HASINTERFACE, false, false, UA_NS0ID_NONHIERARCHICALREFERENCES);

    /**************/

    /* Data Types */

    /**************/

    /* Bootstrap BaseDataType */

    UA_DataTypeAttributes basedatatype_attr = UA_DataTypeAttributes_default;

    basedatatype_attr.displayName = UA_LOCALIZEDTEXT("", "BaseDataType");

    basedatatype_attr.isAbstract = true;

    ret |= ns0_addNode_raw(server, UA_NODECLASS_DATATYPE, UA_NS0ID_BASEDATATYPE, "BaseDataType",

                           &basedatatype_attr, &UA_TYPES[UA_TYPES_DATATYPEATTRIBUTES]);

    /*****************/

    /* VariableTypes */

    /*****************/

    UA_VariableTypeAttributes basevar_attr = UA_VariableTypeAttributes_default;

    basevar_attr.displayName = UA_LOCALIZEDTEXT("", "BaseVariableType");

    basevar_attr.isAbstract = true;

    basevar_attr.valueRank = UA_VALUERANK_ANY;

    basevar_attr.dataType = UA_NS0ID(BASEDATATYPE);

    ret |= ns0_addNode_raw(server, UA_NODECLASS_VARIABLETYPE,

                           UA_NS0ID_BASEVARIABLETYPE, "BaseVariableType",

                           &basevar_attr, &UA_TYPES[UA_TYPES_VARIABLETYPEATTRIBUTES]);

    UA_VariableTypeAttributes bdv_attr = UA_VariableTypeAttributes_default;

    bdv_attr.displayName = UA_LOCALIZEDTEXT("", "BaseDataVariableType");

    bdv_attr.dataType = UA_NS0ID(BASEDATATYPE);

    bdv_attr.valueRank = UA_VALUERANK_ANY;

    ret |= addNode(server, UA_NODECLASS_VARIABLETYPE,

                   UA_NS0ID(BASEDATAVARIABLETYPE), UA_NS0ID(BASEVARIABLETYPE),

                   UA_NODEID_NULL, UA_QUALIFIEDNAME(0, "BaseDataVariableType"),

                   UA_NODEID_NULL, &bdv_attr, &UA_TYPES[UA_TYPES_VARIABLETYPEATTRIBUTES],

                   NULL, NULL);

    UA_VariableTypeAttributes prop_attr = UA_VariableTypeAttributes_default;

    prop_attr.displayName = UA_LOCALIZEDTEXT("", "PropertyType");

    prop_attr.dataType = UA_NS0ID(BASEDATATYPE);

    prop_attr.valueRank = UA_VALUERANK_ANY;

    ret |= addNode(server, UA_NODECLASS_VARIABLETYPE,

                   UA_NS0ID(PROPERTYTYPE), UA_NS0ID(BASEVARIABLETYPE),

                   UA_NODEID_NULL, UA_QUALIFIEDNAME(0, "PropertyType"),

                   UA_NODEID_NULL, &prop_attr,

                   &UA_TYPES[UA_TYPES_VARIABLETYPEATTRIBUTES], NULL, NULL);

    /***************/

    /* ObjectTypes */

    /***************/

    UA_ObjectTypeAttributes baseobj_attr = UA_ObjectTypeAttributes_default;

    baseobj_attr.displayName = UA_LOCALIZEDTEXT("", "BaseObjectType");

    ret |= ns0_addNode_raw(server, UA_NODECLASS_OBJECTTYPE,

                           UA_NS0ID_BASEOBJECTTYPE, "BaseObjectType",

                           &baseobj_attr, &UA_TYPES[UA_TYPES_OBJECTTYPEATTRIBUTES]);

    UA_ObjectTypeAttributes folder_attr = UA_ObjectTypeAttributes_default;

    folder_attr.displayName = UA_LOCALIZEDTEXT("", "FolderType");

    ret |= addNode(server, UA_NODECLASS_OBJECTTYPE,

                   UA_NS0ID(FOLDERTYPE), UA_NS0ID(BASEOBJECTTYPE),

                   UA_NODEID_NULL, UA_QUALIFIEDNAME(0, "FolderType"),

                   UA_NODEID_NULL,

                   &folder_attr, &UA_TYPES[UA_TYPES_OBJECTTYPEATTRIBUTES], NULL, NULL);

    /******************/

    /* Root and below */

    /******************/

    ret |= addObjectNode(server, "Root", UA_NS0ID_ROOTFOLDER, 0, 0, UA_NS0ID_FOLDERTYPE);

    ret |= addObjectNode(server, "Objects", UA_NS0ID_OBJECTSFOLDER, UA_NS0ID_ROOTFOLDER,

                  UA_NS0ID_ORGANIZES, UA_NS0ID_FOLDERTYPE);

    ret |= addObjectNode(server, "Types", UA_NS0ID_TYPESFOLDER, UA_NS0ID_ROOTFOLDER,

                  UA_NS0ID_ORGANIZES, UA_NS0ID_FOLDERTYPE);

    ret |= addObjectNode(server, "ReferenceTypes", UA_NS0ID_REFERENCETYPESFOLDER, UA_NS0ID_TYPESFOLDER,

                  UA_NS0ID_ORGANIZES, UA_NS0ID_FOLDERTYPE);

    ret |= ns0_addNode_finish(server, UA_NS0ID_REFERENCES,

                              UA_NS0ID_REFERENCETYPESFOLDER, UA_NS0ID_ORGANIZES);

    ret |= addObjectNode(server, "DataTypes", UA_NS0ID_DATATYPESFOLDER, UA_NS0ID_TYPESFOLDER,

                  UA_NS0ID_ORGANIZES, UA_NS0ID_FOLDERTYPE);

    ret |= ns0_addNode_finish(server, UA_NS0ID_BASEDATATYPE,

                              UA_NS0ID_DATATYPESFOLDER, UA_NS0ID_ORGANIZES);

    ret |= addObjectNode(server, "VariableTypes", UA_NS0ID_VARIABLETYPESFOLDER, UA_NS0ID_TYPESFOLDER,

                  UA_NS0ID_ORGANIZES, UA_NS0ID_FOLDERTYPE);

    ret |= ns0_addNode_finish(server, UA_NS0ID_BASEVARIABLETYPE,

                              UA_NS0ID_VARIABLETYPESFOLDER, UA_NS0ID_ORGANIZES);

    ret |= addObjectNode(server, "ObjectTypes", UA_NS0ID_OBJECTTYPESFOLDER, UA_NS0ID_TYPESFOLDER,

                  UA_NS0ID_ORGANIZES, UA_NS0ID_FOLDERTYPE);

    ret |= ns0_addNode_finish(server, UA_NS0ID_BASEOBJECTTYPE,

                              UA_NS0ID_OBJECTTYPESFOLDER, UA_NS0ID_ORGANIZES);

    ret |= addObjectNode(server, "EventTypes", UA_NS0ID_EVENTTYPESFOLDER, UA_NS0ID_TYPESFOLDER,

                  UA_NS0ID_ORGANIZES, UA_NS0ID_FOLDERTYPE);

    ret |= addObjectNode(server, "Views", UA_NS0ID_VIEWSFOLDER, UA_NS0ID_ROOTFOLDER,

                  UA_NS0ID_ORGANIZES, UA_NS0ID_FOLDERTYPE);

    /* Add BaseEventType */

    UA_ObjectTypeAttributes eventtype_attr = UA_ObjectTypeAttributes_default;

    eventtype_attr.displayName = UA_LOCALIZEDTEXT("", "BaseEventType");

    ret |= addNode(server, UA_NODECLASS_OBJECTTYPE, UA_NS0ID(BASEEVENTTYPE),

                   UA_NS0ID(BASEOBJECTTYPE), UA_NODEID_NULL,

                   UA_QUALIFIEDNAME(0, "BaseEventType"), UA_NODEID_NULL, &eventtype_attr,

                   &UA_TYPES[UA_TYPES_OBJECTTYPEATTRIBUTES], NULL, NULL);

    ret |= addRef(server, UA_NS0ID(EVENTTYPESFOLDER), UA_NS0ID(ORGANIZES),

                  UA_NS0ID(BASEEVENTTYPE), true);

    if(ret != UA_STATUSCODE_GOOD)

        ret = UA_STATUSCODE_BADINTERNALERROR;

    return ret;

}

/****************/

/* Data Sources */

/****************/

static UA_StatusCode

writeStatus(UA_Server *server, const UA_NodeId *sessionId,

            void *sessionContext, const UA_NodeId *nodeId,

            void *nodeContext, const UA_NumericRange *range,

            const UA_DataValue *value) {

    if(range)

        return UA_STATUSCODE_BADINDEXRANGEINVALID;

    if(nodeId->identifier.numeric != UA_NS0ID_SERVER_SERVERSTATUS_SECONDSTILLSHUTDOWN)

        return UA_STATUSCODE_BADINTERNALERROR;

    /* Only the local user can write into this variable */

    if(sessionId != &server->adminSession.sessionId)

        return UA_STATUSCODE_BADUSERACCESSDENIED;

    if(!UA_Variant_hasScalarType(&value->value, &UA_TYPES[UA_TYPES_UINT32]))

        return UA_STATUSCODE_BADTYPEMISMATCH;

    UA_EventLoop *el = server->config.eventLoop;

    UA_UInt32 *endTime = (UA_UInt32*)value->value.data;

    server->endTime = el->dateTime_now(el) + (UA_DateTime)(*endTime * UA_DATETIME_SEC);

    return UA_STATUSCODE_GOOD;

}

static UA_StatusCode

readStatus(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext,

           const UA_NodeId *nodeId, void *nodeContext, UA_Boolean sourceTimestamp,

           const UA_NumericRange *range, UA_DataValue *value) {

    UA_EventLoop *el = server->config.eventLoop;

    if(range) {

        value->hasStatus = true;

        value->status = UA_STATUSCODE_BADINDEXRANGEINVALID;

        return UA_STATUSCODE_GOOD;

    }

    if(sourceTimestamp) {

        value->hasSourceTimestamp = true;

        value->sourceTimestamp = el->dateTime_now(el);

    }

    void *data = NULL;

    UA_assert(nodeId->identifierType == UA_NODEIDTYPE_NUMERIC);

    switch(nodeId->identifier.numeric) {

    case UA_NS0ID_SERVER_SERVERSTATUS_SECONDSTILLSHUTDOWN: {

        UA_UInt32 *shutdown = UA_UInt32_new();

        if(!shutdown)

            return UA_STATUSCODE_BADOUTOFMEMORY;

        if(server->endTime != 0)

            *shutdown = (UA_UInt32)((server->endTime - el->dateTime_now(el)) / UA_DATETIME_SEC);

        value->value.data = shutdown;

        value->value.type = &UA_TYPES[UA_TYPES_UINT32];

        value->hasValue = true;

        return UA_STATUSCODE_GOOD;

    }

    case UA_NS0ID_SERVER_SERVERSTATUS_STATE: {

        UA_ServerState *state = UA_ServerState_new();

        if(!state)

            return UA_STATUSCODE_BADOUTOFMEMORY;

        if(server->endTime != 0)

            *state = UA_SERVERSTATE_SHUTDOWN;

        value->value.data = state;

        value->value.type = &UA_TYPES[UA_TYPES_SERVERSTATE];

        value->hasValue = true;

        return UA_STATUSCODE_GOOD;

    }

    case UA_NS0ID_SERVER_SERVERSTATUS: {

        UA_ServerStatusDataType *statustype = UA_ServerStatusDataType_new();

        if(!statustype)

            return UA_STATUSCODE_BADOUTOFMEMORY;

        statustype->startTime = server->startTime;

        statustype->currentTime = el->dateTime_now(el);

        statustype->state = UA_SERVERSTATE_RUNNING;

        statustype->secondsTillShutdown = 0;

        if(server->endTime != 0) {

            statustype->state = UA_SERVERSTATE_SHUTDOWN;

            statustype->secondsTillShutdown = (UA_UInt32)

                ((server->endTime - el->dateTime_now(el)) / UA_DATETIME_SEC);

        }

        value->value.data = statustype;

        value->value.type = &UA_TYPES[UA_TYPES_SERVERSTATUSDATATYPE];

        value->hasValue = true;

        return UA_BuildInfo_copy(&server->config.buildInfo, &statustype->buildInfo);

    }

    case UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO:

        value->value.type = &UA_TYPES[UA_TYPES_BUILDINFO];

        data = &server->config.buildInfo;

        break;

    case UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO_PRODUCTURI:

        value->value.type = &UA_TYPES[UA_TYPES_STRING];

        data = &server->config.buildInfo.productUri;

        break;

    case UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO_MANUFACTURERNAME:

        value->value.type = &UA_TYPES[UA_TYPES_STRING];

        data = &server->config.buildInfo.manufacturerName;

        break;

    case UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO_PRODUCTNAME:

        value->value.type = &UA_TYPES[UA_TYPES_STRING];

        data = &server->config.buildInfo.productName;

        break;

    case UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO_SOFTWAREVERSION:

        value->value.type = &UA_TYPES[UA_TYPES_STRING];

        data = &server->config.buildInfo.softwareVersion;

        break;

    case UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO_BUILDNUMBER:

        value->value.type = &UA_TYPES[UA_TYPES_STRING];

        data = &server->config.buildInfo.buildNumber;

        break;

    case UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO_BUILDDATE:

        value->value.type = &UA_TYPES[UA_TYPES_DATETIME];

        data = &server->config.buildInfo.buildDate;

        break;

    default:

        value->hasStatus = true;

        value->status = UA_STATUSCODE_BADINTERNALERROR;

        return UA_STATUSCODE_GOOD;

    }

    value->value.data = UA_new(value->value.type);

    if(!value->value.data) {

        value->value.type = NULL;

        return UA_STATUSCODE_BADOUTOFMEMORY;

    }

    value->hasValue = true;

    return UA_copy(data, value->value.data, value->value.type);

}

#ifdef UA_GENERATED_NAMESPACE_ZERO

static UA_StatusCode

readServiceLevel(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext,

                 const UA_NodeId *nodeId, void *nodeContext, UA_Boolean includeSourceTimeStamp,

                 const UA_NumericRange *range, UA_DataValue *value) {

    UA_EventLoop *el = server->config.eventLoop;

    if(range) {

        value->hasStatus = true;

        value->status = UA_STATUSCODE_BADINDEXRANGEINVALID;

        return UA_STATUSCODE_GOOD;

    }

    value->value.type = &UA_TYPES[UA_TYPES_BYTE];

    value->value.arrayLength = 0;

    UA_Byte *byte = UA_Byte_new();

    if(!byte)

        return UA_STATUSCODE_BADOUTOFMEMORY;

    *byte = 255;

    value->value.data = byte;

    value->value.arrayDimensionsSize = 0;

    value->value.arrayDimensions = NULL;

    value->hasValue = true;

    if(includeSourceTimeStamp) {

        value->hasSourceTimestamp = true;

        value->sourceTimestamp = el->dateTime_now(el);

    }

    return UA_STATUSCODE_GOOD;

}

static UA_StatusCode

readAuditing(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext,

             const UA_NodeId *nodeId, void *nodeContext, UA_Boolean includeSourceTimeStamp,

             const UA_NumericRange *range, UA_DataValue *value) {

    UA_EventLoop *el = server->config.eventLoop;

    if(range) {

        value->hasStatus = true;

        value->status = UA_STATUSCODE_BADINDEXRANGEINVALID;

        return UA_STATUSCODE_GOOD;

    }

    value->value.type = &UA_TYPES[UA_TYPES_BOOLEAN];

    value->value.arrayLength = 0;

    UA_Boolean *boolean = UA_Boolean_new();

    if(!boolean)

        return UA_STATUSCODE_BADOUTOFMEMORY;

    *boolean = false;

    value->value.data = boolean;

    value->value.arrayDimensionsSize = 0;

    value->value.arrayDimensions = NULL;

    value->hasValue = true;

    if(includeSourceTimeStamp) {

        value->hasSourceTimestamp = true;

        value->sourceTimestamp = el->dateTime_now(el);

    }

    return UA_STATUSCODE_GOOD;

}

#endif

static UA_StatusCode

readNamespaces(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext,

               const UA_NodeId *nodeid, void *nodeContext, UA_Boolean includeSourceTimeStamp,

               const UA_NumericRange *range,

               UA_DataValue *value) {

    UA_EventLoop *el = server->config.eventLoop;

    /* ensure that the uri for ns1 is set up from the app description */

    setupNs1Uri(server);

    if(range) {

        value->hasStatus = true;

        value->status = UA_STATUSCODE_BADINDEXRANGEINVALID;

        return UA_STATUSCODE_GOOD;

    }

    UA_StatusCode retval;

    retval = UA_Variant_setArrayCopy(&value->value, server->namespaces,

                                     server->namespacesSize, &UA_TYPES[UA_TYPES_STRING]);

    if(retval != UA_STATUSCODE_GOOD)

        return retval;

    value->hasValue = true;

    if(includeSourceTimeStamp) {

        value->hasSourceTimestamp = true;

        value->sourceTimestamp = el->dateTime_now(el);

    }

    return UA_STATUSCODE_GOOD;

}

static UA_StatusCode

writeNamespaces(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext,

                const UA_NodeId *nodeid, void *nodeContext, const UA_NumericRange *range,

                const UA_DataValue *value) {

    /* Check the data type */

    if(!value->hasValue ||

       value->value.type != &UA_TYPES[UA_TYPES_STRING])

        return UA_STATUSCODE_BADTYPEMISMATCH;

    /* Check that the variant is not empty */

    if(!value->value.data)

        return UA_STATUSCODE_BADTYPEMISMATCH;

    /* TODO: Writing with a range is not implemented */

    if(range)

        return UA_STATUSCODE_BADINTERNALERROR;

    UA_String *newNamespaces = (UA_String*)value->value.data;

    size_t newNamespacesSize = value->value.arrayLength;

    /* Test if we append to the existing namespaces */

    if(newNamespacesSize <= server->namespacesSize)

        return UA_STATUSCODE_BADTYPEMISMATCH;

    /* ensure that the uri for ns1 is set up from the app description */

    setupNs1Uri(server);

    /* Test if the existing namespaces are unchanged */

    for(size_t i = 0; i < server->namespacesSize; ++i) {

        if(!UA_String_equal(&server->namespaces[i], &newNamespaces[i]))

            return UA_STATUSCODE_BADINTERNALERROR;

    }

    /* Add namespaces */

    for(size_t i = server->namespacesSize; i < newNamespacesSize; ++i)

        addNamespace(server, newNamespaces[i]);

    return UA_STATUSCODE_GOOD;

}

static UA_StatusCode

readCurrentTime(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext,

                const UA_NodeId *nodeid, void *nodeContext, UA_Boolean sourceTimeStamp,

                const UA_NumericRange *range, UA_DataValue *value) {

    UA_EventLoop *el = server->config.eventLoop;

    if(range) {

        value->hasStatus = true;

        value->status = UA_STATUSCODE_BADINDEXRANGEINVALID;

        return UA_STATUSCODE_GOOD;

    }

    UA_DateTime currentTime = el->dateTime_now(el);

    UA_StatusCode retval = UA_Variant_setScalarCopy(&value->value, &currentTime,

                                                    &UA_TYPES[UA_TYPES_DATETIME]);

    if(retval != UA_STATUSCODE_GOOD)

        return retval;

    value->hasValue = true;

    if(sourceTimeStamp) {

        value->hasSourceTimestamp = true;

        value->sourceTimestamp = currentTime;

    }

    return UA_STATUSCODE_GOOD;

}

#ifdef UA_GENERATED_NAMESPACE_ZERO

static UA_StatusCode

readOperationLimits(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext,

                        const UA_NodeId *nodeid, void *nodeContext, UA_Boolean includeSourceTimeStamp,

                        const UA_NumericRange *range,

                        UA_DataValue *value) {

    UA_StatusCode retval = UA_STATUSCODE_GOOD;

    if(nodeid->identifierType != UA_NODEIDTYPE_NUMERIC)

        return UA_STATUSCODE_BADNOTSUPPORTED;

    switch(nodeid->identifier.numeric) {

        case UA_NS0ID_SERVER_SERVERCAPABILITIES_OPERATIONLIMITS_MAXNODESPERREAD:

            retval = UA_Variant_setScalarCopy(&value->value, &server->config.maxNodesPerRead, &UA_TYPES[UA_TYPES_UINT32]);

            break;

        case UA_NS0ID_SERVER_SERVERCAPABILITIES_OPERATIONLIMITS_MAXNODESPERWRITE:

            retval = UA_Variant_setScalarCopy(&value->value, &server->config.maxNodesPerWrite, &UA_TYPES[UA_TYPES_UINT32]);

            break;

        case UA_NS0ID_SERVER_SERVERCAPABILITIES_OPERATIONLIMITS_MAXNODESPERMETHODCALL:

            retval = UA_Variant_setScalarCopy(&value->value, &server->config.maxNodesPerMethodCall, &UA_TYPES[UA_TYPES_UINT32]);

            break;

        case UA_NS0ID_SERVER_SERVERCAPABILITIES_OPERATIONLIMITS_MAXNODESPERBROWSE:

            retval = UA_Variant_setScalarCopy(&value->value, &server->config.maxNodesPerBrowse, &UA_TYPES[UA_TYPES_UINT32]);

            break;

        case UA_NS0ID_SERVER_SERVERCAPABILITIES_OPERATIONLIMITS_MAXNODESPERREGISTERNODES:

            retval = UA_Variant_setScalarCopy(&value->value, &server->config.maxNodesPerRegisterNodes, &UA_TYPES[UA_TYPES_UINT32]);

            break;

        case UA_NS0ID_SERVER_SERVERCAPABILITIES_OPERATIONLIMITS_MAXNODESPERTRANSLATEBROWSEPATHSTONODEIDS:

            retval = UA_Variant_setScalarCopy(&value->value, &server->config.maxNodesPerTranslateBrowsePathsToNodeIds, &UA_TYPES[UA_TYPES_UINT32]);

            break;

        case UA_NS0ID_SERVER_SERVERCAPABILITIES_OPERATIONLIMITS_MAXNODESPERNODEMANAGEMENT:

            retval = UA_Variant_setScalarCopy(&value->value, &server->config.maxNodesPerNodeManagement, &UA_TYPES[UA_TYPES_UINT32]);

            break;

        case UA_NS0ID_SERVER_SERVERCAPABILITIES_OPERATIONLIMITS_MAXMONITOREDITEMSPERCALL:

            retval = UA_Variant_setScalarCopy(&value->value, &server->config.maxMonitoredItemsPerCall, &UA_TYPES[UA_TYPES_UINT32]);

            break;

        default:

            retval = UA_STATUSCODE_BADNOTSUPPORTED;

    }

    return retval;

}

static UA_StatusCode

readMinSamplingInterval(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext,

               const UA_NodeId *nodeid, void *nodeContext, UA_Boolean includeSourceTimeStamp,

               const UA_NumericRange *range, UA_DataValue *value) {

    UA_EventLoop *el = server->config.eventLoop;

    if(range) {

        value->hasStatus = true;

        value->status = UA_STATUSCODE_BADINDEXRANGEINVALID;

        return UA_STATUSCODE_GOOD;

    }

    UA_StatusCode retval;

    UA_Duration minInterval;

#ifdef UA_ENABLE_SUBSCRIPTIONS

    minInterval = server->config.samplingIntervalLimits.min;

#else

    minInterval = 0.0;

#endif

    retval = UA_Variant_setScalarCopy(&value->value, &minInterval, &UA_TYPES[UA_TYPES_DURATION]);

    if(retval != UA_STATUSCODE_GOOD)

        return retval;

    value->hasValue = true;

    if(includeSourceTimeStamp) {

        value->hasSourceTimestamp = true;

        value->sourceTimestamp = el->dateTime_now(el);

    }

    return UA_STATUSCODE_GOOD;

}

#endif

#if defined(UA_GENERATED_NAMESPACE_ZERO) && defined(UA_ENABLE_METHODCALLS) && defined(UA_ENABLE_SUBSCRIPTIONS)

static UA_StatusCode

resendData(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext,

           const UA_NodeId *methodId, void *methodContext, const UA_NodeId *objectId,

           void *objectContext, size_t inputSize, const UA_Variant *input,

           size_t outputSize, UA_Variant *output) {

    /* Get the input argument */

    if(inputSize != 1 ||

       !UA_Variant_hasScalarType(input, &UA_TYPES[UA_TYPES_UINT32]))

        return UA_STATUSCODE_BADSUBSCRIPTIONIDINVALID;

    UA_UInt32 subscriptionId = *((UA_UInt32*)(input[0].data));

    /* Get the Session */

    lockServer(server);

    UA_Session *session = getSessionById(server, sessionId);

    if(!session) {

        unlockServer(server);

        return UA_STATUSCODE_BADINTERNALERROR;

    }

    /* Get the Subscription */

    UA_Subscription *subscription = getSubscriptionById(server, subscriptionId);

    if(!subscription) {

        unlockServer(server);

        return UA_STATUSCODE_BADSUBSCRIPTIONIDINVALID;

    }

    /* The Subscription is not attached to this Session */

    if(subscription->session != session) {

        unlockServer(server);

        return UA_STATUSCODE_BADUSERACCESSDENIED;

    }

    UA_Subscription_resendData(server, subscription);

    unlockServer(server);

    return UA_STATUSCODE_GOOD;

}

static UA_StatusCode

readMonitoredItems(UA_Server *server, const UA_NodeId *sessionId, void *sessionContext,

                   const UA_NodeId *methodId, void *methodContext, const UA_NodeId *objectId,

                   void *objectContext, size_t inputSize, const UA_Variant *input,

                   size_t outputSize, UA_Variant *output) {

    /* Return two empty arrays by default */

    UA_Variant_setArray(&output[0], UA_Array_new(0, &UA_TYPES[UA_TYPES_UINT32]),

                        0, &UA_TYPES[UA_TYPES_UINT32]);

    UA_Variant_setArray(&output[1], UA_Array_new(0, &UA_TYPES[UA_TYPES_UINT32]),

                        0, &UA_TYPES[UA_TYPES_UINT32]);

    lockServer(server);

    /* Get the Session */

    UA_Session *session = getSessionById(server, sessionId);

    if(!session) {

        unlockServer(server);

        return UA_STATUSCODE_BADINTERNALERROR;

    }

    if(inputSize == 0 || !input[0].data) {

        unlockServer(server);

        return UA_STATUSCODE_BADSUBSCRIPTIONIDINVALID;

    }

    /* Get the Subscription */

    UA_UInt32 subscriptionId = *((UA_UInt32*)(input[0].data));

    UA_Subscription *subscription = getSubscriptionById(server, subscriptionId);

    if(!subscription) {

        unlockServer(server);

        return UA_STATUSCODE_BADSUBSCRIPTIONIDINVALID;

    }

    /* The Subscription is not attached to this Session */

    if(subscription->session != session) {

        unlockServer(server);

        return UA_STATUSCODE_BADUSERACCESSDENIED;

    }

    /* Count the MonitoredItems */

    UA_UInt32 sizeOfOutput = 0;

    UA_MonitoredItem* monitoredItem;

    LIST_FOREACH(monitoredItem, &subscription->monitoredItems, listEntry) {

        ++sizeOfOutput;

    }

    if(sizeOfOutput == 0) {

        unlockServer(server);

        return UA_STATUSCODE_GOOD;

    }

    /* Allocate the output arrays */

    UA_UInt32 *clientHandles = (UA_UInt32*)

        UA_Array_new(sizeOfOutput, &UA_TYPES[UA_TYPES_UINT32]);

    if(!clientHandles) {

        unlockServer(server);

        return UA_STATUSCODE_BADOUTOFMEMORY;

    }

    UA_UInt32 *serverHandles = (UA_UInt32*)

        UA_Array_new(sizeOfOutput, &UA_TYPES[UA_TYPES_UINT32]);

    if(!serverHandles) {

        unlockServer(server);

        UA_free(clientHandles);

        return UA_STATUSCODE_BADOUTOFMEMORY;

    }

    /* Fill the array */

    UA_UInt32 i = 0;

    LIST_FOREACH(monitoredItem, &subscription->monitoredItems, listEntry) {

        clientHandles[i] = monitoredItem->parameters.clientHandle;

        serverHandles[i] = monitoredItem->monitoredItemId;

        ++i;

    }

    UA_Variant_setArray(&output[0], serverHandles, sizeOfOutput, &UA_TYPES[UA_TYPES_UINT32]);

    UA_Variant_setArray(&output[1], clientHandles, sizeOfOutput, &UA_TYPES[UA_TYPES_UINT32]);

    unlockServer(server);

    return UA_STATUSCODE_GOOD;

}

#endif /* defined(UA_ENABLE_METHODCALLS) && defined(UA_ENABLE_SUBSCRIPTIONS) */

static UA_StatusCode

writeNs0VariableArray(UA_Server *server, UA_UInt32 id, void *v,

                      size_t length, const UA_DataType *type) {

    UA_Variant var;

    UA_Variant_init(&var);

    UA_Variant_setArray(&var, v, length, type);

    return writeValueAttribute(server, UA_NODEID_NUMERIC(0, id), &var);

}

#ifdef UA_GENERATED_NAMESPACE_ZERO

static UA_StatusCode

writeNs0Variable(UA_Server *server, UA_UInt32 id, void *v, const UA_DataType *type) {

    UA_Variant var;

    UA_Variant_init(&var);

    UA_Variant_setScalar(&var, v, type);

    return writeValueAttribute(server, UA_NODEID_NUMERIC(0, id), &var);

}

#endif

#ifndef UA_GENERATED_NAMESPACE_ZERO

static UA_StatusCode

addVariableNode(UA_Server *server, char* name, UA_UInt32 variableid,

                UA_UInt32 parentid, UA_UInt32 referenceid,

                UA_Int32 valueRank, UA_UInt32 dataType) {

    UA_VariableAttributes attr = UA_VariableAttributes_default;

    attr.displayName = UA_LOCALIZEDTEXT("", name);

    attr.dataType = UA_NODEID_NUMERIC(0, dataType);

    attr.valueRank = valueRank;

    attr.accessLevel = UA_ACCESSLEVELMASK_READ;

    return addNode(server, UA_NODECLASS_VARIABLE, UA_NODEID_NUMERIC(0, variableid),

                   UA_NODEID_NUMERIC(0, parentid), UA_NODEID_NUMERIC(0, referenceid),

                   UA_QUALIFIEDNAME(0, name), UA_NS0ID(BASEDATAVARIABLETYPE),

                   &attr, &UA_TYPES[UA_TYPES_VARIABLEATTRIBUTES], NULL, NULL);

}

/* A minimal server object that is not complete and does not use the mandated

 * references to a server type. To be used on very constrained devices. */

static UA_StatusCode

minimalServerObject(UA_Server *server) {

    /* Server */

    UA_StatusCode retval = addObjectNode(server, "Server", UA_NS0ID_SERVER, UA_NS0ID_OBJECTSFOLDER,

                                         UA_NS0ID_ORGANIZES, UA_NS0ID_BASEOBJECTTYPE);

    /* Use a valuerank of -2 for now. The array is added later on and the valuerank set to 1. */

    retval |= addVariableNode(server, "ServerArray", UA_NS0ID_SERVER_SERVERARRAY,

                              UA_NS0ID_SERVER, UA_NS0ID_HASPROPERTY,

                              UA_VALUERANK_ANY, UA_NS0ID_BASEDATATYPE);

    retval |= addVariableNode(server, "NamespaceArray", UA_NS0ID_SERVER_NAMESPACEARRAY,

                              UA_NS0ID_SERVER, UA_NS0ID_HASPROPERTY,

                              UA_VALUERANK_ANY, UA_NS0ID_BASEDATATYPE);

    retval |= addVariableNode(server, "ServerStatus", UA_NS0ID_SERVER_SERVERSTATUS,

                              UA_NS0ID_SERVER, UA_NS0ID_HASCOMPONENT,

                              UA_VALUERANK_SCALAR, UA_NS0ID_BASEDATATYPE);

    retval |= addVariableNode(server, "StartTime", UA_NS0ID_SERVER_SERVERSTATUS_STARTTIME,

                              UA_NS0ID_SERVER_SERVERSTATUS, UA_NS0ID_HASCOMPONENT,

                              UA_VALUERANK_SCALAR, UA_NS0ID_BASEDATATYPE);

    retval |= addVariableNode(server, "CurrentTime", UA_NS0ID_SERVER_SERVERSTATUS_CURRENTTIME,

                              UA_NS0ID_SERVER_SERVERSTATUS, UA_NS0ID_HASCOMPONENT,

                              UA_VALUERANK_SCALAR, UA_NS0ID_BASEDATATYPE);

    retval |= addVariableNode(server, "State", UA_NS0ID_SERVER_SERVERSTATUS_STATE,

                              UA_NS0ID_SERVER_SERVERSTATUS, UA_NS0ID_HASCOMPONENT,

                              UA_VALUERANK_SCALAR, UA_NS0ID_BASEDATATYPE);

    retval |= addVariableNode(server, "BuildInfo", UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO,

                              UA_NS0ID_SERVER_SERVERSTATUS, UA_NS0ID_HASCOMPONENT,

                              UA_VALUERANK_SCALAR, UA_NS0ID_BASEDATATYPE);

    retval |= addVariableNode(server, "ProductUri", UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO_PRODUCTURI,

                              UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO, UA_NS0ID_HASCOMPONENT,

                              UA_VALUERANK_SCALAR, UA_NS0ID_BASEDATATYPE);

    retval |= addVariableNode(server, "ManufacturerName",

                              UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO_MANUFACTURERNAME,

                              UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO, UA_NS0ID_HASCOMPONENT,

                              UA_VALUERANK_SCALAR, UA_NS0ID_BASEDATATYPE);

    retval |= addVariableNode(server, "ProductName",

                              UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO_PRODUCTNAME,

                              UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO, UA_NS0ID_HASCOMPONENT,

                              UA_VALUERANK_SCALAR, UA_NS0ID_BASEDATATYPE);

    retval |= addVariableNode(server, "SoftwareVersion",

                              UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO_SOFTWAREVERSION,

                              UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO, UA_NS0ID_HASCOMPONENT,

                              UA_VALUERANK_SCALAR, UA_NS0ID_BASEDATATYPE);

    retval |= addVariableNode(server, "BuildNumber",

                              UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO_BUILDNUMBER,

                              UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO, UA_NS0ID_HASCOMPONENT,

                              UA_VALUERANK_SCALAR, UA_NS0ID_BASEDATATYPE);

    retval |= addVariableNode(server, "BuildDate",

                              UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO_BUILDDATE,

                              UA_NS0ID_SERVER_SERVERSTATUS_BUILDINFO, UA_NS0ID_HASCOMPONENT,

                              UA_VALUERANK_SCALAR, UA_NS0ID_BASEDATATYPE);

    return retval;

}

#else

static void

addModellingRules(UA_Server *server) {

    /* Test if the ModellingRules folder was added. (Only for the full ns0.) */

    UA_NodeId mrNodeId = UA_NS0ID(SERVER_SERVERCAPABILITIES_MODELLINGRULES);

    const UA_Node *mrnode = UA_NODESTORE_GET(server, &mrNodeId);

    if(!mrnode)

        return;

    UA_NODESTORE_RELEASE(server, mrnode);

    /* Add ExposesItsArray */

    addRef(server, UA_NS0ID(SERVER_SERVERCAPABILITIES_MODELLINGRULES),

           UA_NS0ID(HASCOMPONENT), UA_NS0ID(MODELLINGRULE_EXPOSESITSARRAY), true);

    /* Add Mandatory */

    addRef(server, UA_NS0ID(SERVER_SERVERCAPABILITIES_MODELLINGRULES),

           UA_NS0ID(HASCOMPONENT), UA_NS0ID(MODELLINGRULE_MANDATORY), true);

    /* Add MandatoryPlaceholder */

    addRef(server, UA_NS0ID(SERVER_SERVERCAPABILITIES_MODELLINGRULES),

           UA_NS0ID(HASCOMPONENT), UA_NS0ID(MODELLINGRULE_MANDATORYPLACEHOLDER), true);

    /* Add Optional */

    addRef(server, UA_NS0ID(SERVER_SERVERCAPABILITIES_MODELLINGRULES),

           UA_NS0ID(HASCOMPONENT), UA_NS0ID(MODELLINGRULE_OPTIONAL), true);

    /* Add OptionalPlaceholder */

    addRef(server, UA_NS0ID(SERVER_SERVERCAPABILITIES_MODELLINGRULES),

           UA_NS0ID(HASCOMPONENT), UA_NS0ID(MODELLINGRULE_OPTIONALPLACEHOLDER), true);

}

#endif

/* Initialize the nodeset 0 by using the generated code of the nodeset compiler.

 * This also initialized the data sources for various variables, such as for

 * example server time. */

UA_StatusCode

initNS0(UA_Server *server) {

    UA_LOCK_ASSERT(&server->serviceMutex);

    /* Initialize base nodes which are always required an cannot be created

     * through the NS compiler */

    server->bootstrapNS0 = true;

    UA_StatusCode retVal = createNS0_base(server);

#ifdef UA_GENERATED_NAMESPACE_ZERO

    /* Load nodes and references generated from the XML ns0 definition */

    retVal |= namespace0_generated(server);

#else

    /* Create a minimal server object */

    retVal |= minimalServerObject(server);

#endif

    server->bootstrapNS0 = false;

    if(retVal != UA_STATUSCODE_GOOD) {

        UA_LOG_ERROR(server->config.logging, UA_LOGCATEGORY_SERVER,

                     "Initialization of Namespace 0 failed with %s. "

                     "See previous outputs for any error messages.",

                     UA_StatusCode_name(retVal));

        return UA_STATUSCODE_BADINTERNALERROR;

    }

    /* NamespaceArray */

    UA_CallbackValueSource namespaceDataSource = {readNamespaces, writeNamespaces};

    retVal |= setVariableNode_callbackValueSource(server, UA_NS0ID(SERVER_NAMESPACEARRAY),

                                                  namespaceDataSource);

    retVal |= writeValueRankAttribute(server, UA_NS0ID(SERVER_NAMESPACEARRAY), 1);

    /* ServerArray */

    retVal |= writeNs0VariableArray(server, UA_NS0ID_SERVER_SERVERARRAY,

                                    &server->config.applicationDescription.applicationUri,