用于添加具有正确类型的节点ID的结构

Question

我正在尝试在我的服务器上指定节点ID，但不了解我应该遵循的结构。我遵循看似简单的结构来更改节点ID，并且没有收到错误或警告。我成功创建了节点，如下所示，但没有创建node_id。我想添加一个简单的节点id，我将遵循相同的结构，并添加带有$$$$的行;

// opcua_server.c

#include "ua_types.h"
#define HANDLE_PDU1 15

const uint8_t EN_DISPLAYNAME_PDU1[] = "PDU1";
const UA_UTF8_string_t ENGLISH_TEXT[] = {
    {0, 0}, {sizeof(EN_DISPLAYNAME_PDU1) - 1, EN_DISPLAYNAME_PDU1}};

void opcua_add_nodes(void) {
    UA_Status_t status = 0;

    // Add PDU1 Folder
    UA_Folder_t PDU1;
    UAServer_Init_config_structure_Folder(&PDU1);
    PDU1.node_handle = HANDLE_PDU1;
    PDU1.display_name_handle = HANDLE_PDU1;
    UA_NodeId_Config_t randomHANDLE; // $$$$ Not creating node id
    PDU1.node_id = randomHANDLE;     // $$$$ Not creating node id

    status = UAServer_Create_Folder(&PDU1);
    if (status != 0) {
        UA_SERVER_PRINTF("UAServer_Create_Folder returned: %d\n",
                         (uint16_t)status);
    }
    status = UAServer_Add_to_folder(folder.node_handle, PDU1.node_handle);
    if (status != 0) {
        UA_SERVER_PRINTF("UAServer_Add_to_objects_folder returned: %d\n",
                         (uint16_t)status);
    }
}

// ua_types.h
typedef struct {
    /**
     * A mandatory unique identifier that identifies the node in the library.
     * The value zero is invalid.
     */
    uint32_t node_handle;
    /**
     * A mandatory unique identifier that allows the host to efficiently look up
     * the
     * node name text to display in a translate callback. The value zero is
     * invalid.
     */
    uint32_t display_name_handle;
    /**
     * An optional unique identifier that allows the host to efficiently look up
     * the
     * node description text to display in a translate callback. The value zero
     * is
     * invalid.
     */
    uint32_t description_handle;
    /**
     * An optional visibility mask that restricts the visibility of the node
     * depending
     * on which user is logged in. The anonymous user is bit 0 and bits 1 - 15
     * represent the corresponding users
     */
    uint16_t user_visibility;
    /**
     * Specifies the namespace index for this node. The UA namespace is 0 and
     * cannot
     * be used. The default server namespace is 1. Other namespaces may be added
     * to the configuration data structure.
     */
    uint16_t namespace_index;
    /**
     * An optional parameter set that defines the NodeId for the node as a
     * string
     * or a GUID. If this parameter is set to default values then the SDK will
     * assign
     * an opaque node id to the node. Opaque node ids are easily decoded by the
     * SDK
     * and offer the best performance. Only populate this parameter set if your
     * application requires it.
     */
    UA_NodeId_Config_t node_id;
} UA_Base_t;

/*****************************************************************************/
/** \brief A configuration structure for Folder address space nodes.
 *
 */
typedef UA_Base_t UA_Folder_t;

/*****************************************************************************/
/** \brief A configuration structure for View address space nodes.
 *
*/
typedef UA_Folder_t UA_View_t;

/*****************************************************************************/
/** \brief A configuration structure for Method address space nodes.
 *
 */
typedef struct {
    /**
     * Configuration common to all nodes
     */
    UA_Base_t base_config;
    /**
     * The file size in bytes
     */
    uint64_t size;
    /**
     * The file is writable
     */
    bool_t writable;
    /**
     * An optional writable mask that restricts write access of the file
     * depending
     * on which user is logged in. The anonymous user is bit 0 and bits 1 - 15
     * represent the corresponding users
     */
    uint16_t user_writable;
} UA_File_t;

Answer 1

定义PDU1时，已创建node_id并与之关联。您只需访问node_id并为其每个元素分配值。

替换

UA_NodeId_Config_t randomHANDLE; // $$$$ Not creating node id
PDU1.node_id = randomHANDLE;     // $$$$ Not creating node id

与

PDU1.node_id.identifier_type = xxxx;  // xxxx, yyyy, zzz is whatever valid value for their type.
PDU1.node_id.string_identifier = yyyy; 
PDU1.node_id.guid_identifier = zzzz; 

Answer 2

结果我需要指定标识符类型（我通过查看标识符类型来做）并将其设置为等于opcua_node_encoding_string。结果是我创建的字符串节点ID。

    //Add PDU1 Folder
    UA_Folder_t PDU1;
    UAServer_Init_config_structure_Folder(&PDU1);

    PDU1.node_handle             = HANDLE_PDU1;
    PDU1.display_name_handle     = HANDLE_PDU1;
    PDU1.node_id.identifier_type = opcua_node_encoding_string;

    const char TEST_STRING_ID2[]          = "PDU1";
    PDU1.node_id.string_identifier.length = sizeof(TEST_STRING_ID2) - 1;
    PDU1.node_id.string_identifier.data   = (uint8_t*)TEST_STRING_ID2;

    status = UAServer_Create_Folder(&PDU1);
    if (status != 0)
    {
        UA_SERVER_PRINTF("UAServer_Create_Folder returned: %d\n",        (uint16_t)status);
    }
    status = UAServer_Add_to_folder(folder.node_handle, PDU1.node_handle);
    if (status != 0)
    {
        UA_SERVER_PRINTF("UAServer_Add_to_objects_folder returned: %d\n", (uint16_t)status);
    }