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95 lines
3.3 KiB
C
95 lines
3.3 KiB
C
/* This work is licensed under a Creative Commons CCZero 1.0 Universal License.
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* See http://creativecommons.org/publicdomain/zero/1.0/ for more information. */
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/**
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* Faking source timestamp
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* ----------------------------
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*
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* This example shows how to write data with a modified source timestamp
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* When showing the data in UAExpert, the source timestamp will always be half an hour behind the server timestamp
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*/
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#include <open62541/plugin/log_stdout.h>
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#include <open62541/server.h>
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#include <open62541/server_config_default.h>
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#include <signal.h>
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#include <stdlib.h>
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static void
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addVariable(UA_Server *server) {
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/* Define the attribute of the myInteger variable node */
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UA_VariableAttributes attr = UA_VariableAttributes_default;
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UA_Int32 myInteger = 0;
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UA_Variant_setScalar(&attr.value, &myInteger, &UA_TYPES[UA_TYPES_INT32]);
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attr.description = UA_LOCALIZEDTEXT("en-US","fake source_timestamp");
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attr.displayName = UA_LOCALIZEDTEXT("en-US","fake source_timestamp");
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attr.dataType = UA_TYPES[UA_TYPES_INT32].typeId;
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attr.accessLevel = UA_ACCESSLEVELMASK_READ | UA_ACCESSLEVELMASK_WRITE;
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/* Add the variable node to the information model */
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UA_NodeId myIntegerNodeId = UA_NODEID_STRING(1, "fake.source_timestamp");
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UA_QualifiedName myIntegerName = UA_QUALIFIEDNAME(1, "fake source_timestamp");
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UA_NodeId parentNodeId = UA_NS0ID(OBJECTSFOLDER);
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UA_NodeId parentReferenceNodeId = UA_NS0ID(ORGANIZES);
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UA_Server_addVariableNode(server, myIntegerNodeId, parentNodeId,
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parentReferenceNodeId, myIntegerName,
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UA_NS0ID(BASEDATAVARIABLETYPE), attr, NULL, NULL);
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}
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/**
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* Now we change the value with the write service. This uses the same service
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* implementation that can also be reached over the network by an OPC UA client.
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*/
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static void
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writeVariable(UA_Server *server, UA_Int32 myInteger ) {
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UA_NodeId myIntegerNodeId = UA_NODEID_STRING(1, "fake.source_timestamp");
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/* Write a different integer value */
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UA_VariableAttributes Attr;
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UA_Variant_init(&Attr.value);
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UA_Variant_setScalar(&Attr.value, &myInteger, &UA_TYPES[UA_TYPES_INT32]);
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// Use a more detailed write function than UA_Server_writeValue
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UA_WriteValue wv;
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UA_WriteValue_init(&wv);
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wv.nodeId = myIntegerNodeId;
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wv.attributeId = UA_ATTRIBUTEID_VALUE;
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wv.value.hasStatus = false;
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wv.value.value = Attr.value;
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wv.value.hasValue = true;
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UA_DateTime currentTime = UA_DateTime_now();
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wv.value.hasSourceTimestamp = true;
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wv.value.sourceTimestamp = currentTime - 1800 * UA_DATETIME_SEC;
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UA_Server_writeDataValue(server, myIntegerNodeId, wv.value );
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}
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/** It follows the main server code, making use of the above definitions. */
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static volatile UA_Boolean running = true;
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static void stopHandler(int sign) {
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UA_LOG_INFO(UA_Log_Stdout, UA_LOGCATEGORY_SERVER, "received ctrl-c");
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running = false;
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}
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int main(void) {
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signal(SIGINT, stopHandler);
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signal(SIGTERM, stopHandler);
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UA_Server *server = UA_Server_new();
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UA_ServerConfig_setDefault(UA_Server_getConfig(server));
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addVariable(server);
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writeVariable(server,42);
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UA_StatusCode retval = UA_Server_run(server, &running);
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UA_Server_delete(server);
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return retval == UA_STATUSCODE_GOOD ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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