在open62541中從客戶端單個請求中讀取多個節點

Question

任何人都可以告訴我在open62541中對服務器的單個請求中讀取多個節點的語法。

我一直在從open62541客戶端到服務器的UA_Client_readValueAttribute(client, UA_NODEID_STRING(1, "variable"), &value)執行單個讀取請求。

Answer 1

您可以使用標准讀取服務：

UA_Client_Service_read(UA_Client *client, const UA_ReadRequest request)

請參閱： https ： //github.com/open62541/open62541/blob/6c82b082c8a6c3b1faebc43387a1b0cb3eced051/include/ua_client.h#L203

例如：

UA_ReadRequest request;
UA_ReadRequest_init(&request);
UA_ReadValueId ids[2];
UA_ReadValueId_init(&ids[0]);
ids[0].attributeId = UA_ATTRIBUTEID_VALUE;
ids[0].nodeId = UA_NODEID_NUMERIC(0, UA_NS0ID_SERVER_NAMESPACEARRAY);

UA_ReadValueId_init(&ids[1]);
ids[1].attributeId = UA_ATTRIBUTEID_VALUE;
ids[1].nodeId = UA_NODEID_NUMERIC(0, UA_NS0ID_SERVER_STATUS);

// set here the nodes you want to read
request.nodesToRead = ids;
request.nodesToReadSize = 2;

UA_ReadResponse response = UA_Client_Service_read(client, request);

// do something with the response

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Crosspost： https ： //github.com/open62541/open62541/issues/1426