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client.c
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client.c
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/* This work is licensed under a Creative Commons CCZero 1.0 Universal License.
* See http://creativecommons.org/publicdomain/zero/1.0/ for more information. */
#include <open62541/client_config_default.h>
#include <open62541/client_highlevel.h>
#include <open62541/client_subscriptions.h>
#include <open62541/plugin/log_stdout.h>
#include <stdlib.h>
#ifdef UA_ENABLE_SUBSCRIPTIONS
static void
handler_TheAnswerChanged(UA_Client *client, UA_UInt32 subId, void *subContext,
UA_UInt32 monId, void *monContext, UA_DataValue *value) {
printf("The Answer has changed!\n");
}
#endif
static UA_StatusCode
nodeIter(UA_NodeId childId, UA_Boolean isInverse, UA_NodeId referenceTypeId, void *handle) {
if(isInverse)
return UA_STATUSCODE_GOOD;
UA_NodeId *parent = (UA_NodeId *)handle;
printf("%d, %d --- %d ---> NodeId %d, %d\n",
parent->namespaceIndex, parent->identifier.numeric,
referenceTypeId.identifier.numeric, childId.namespaceIndex,
childId.identifier.numeric);
return UA_STATUSCODE_GOOD;
}
int main(int argc, char *argv[]) {
UA_Client *client = UA_Client_new();
UA_ClientConfig_setDefault(UA_Client_getConfig(client));
/* Listing endpoints */
UA_EndpointDescription* endpointArray = NULL;
size_t endpointArraySize = 0;
UA_StatusCode retval = UA_Client_getEndpoints(client, "opc.tcp://localhost:4840",
&endpointArraySize, &endpointArray);
if(retval != UA_STATUSCODE_GOOD) {
UA_Array_delete(endpointArray, endpointArraySize, &UA_TYPES[UA_TYPES_ENDPOINTDESCRIPTION]);
UA_Client_delete(client);
return EXIT_FAILURE;
}
printf("%i endpoints found\n", (int)endpointArraySize);
for(size_t i=0;i<endpointArraySize;i++) {
printf("URL of endpoint %i is %.*s\n", (int)i,
(int)endpointArray[i].endpointUrl.length,
endpointArray[i].endpointUrl.data);
}
UA_Array_delete(endpointArray,endpointArraySize, &UA_TYPES[UA_TYPES_ENDPOINTDESCRIPTION]);
/* Connect to a server */
/* anonymous connect would be: retval = UA_Client_connect(client, "opc.tcp://localhost:4840"); */
retval = UA_Client_connectUsername(client, "opc.tcp://localhost:4840", "user1", "password");
if(retval != UA_STATUSCODE_GOOD) {
UA_Client_delete(client);
return EXIT_FAILURE;
}
/* Browse some objects */
printf("Browsing nodes in objects folder:\n");
UA_BrowseRequest bReq;
UA_BrowseRequest_init(&bReq);
bReq.requestedMaxReferencesPerNode = 0;
bReq.nodesToBrowse = UA_BrowseDescription_new();
bReq.nodesToBrowseSize = 1;
bReq.nodesToBrowse[0].nodeId = UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER); /* browse objects folder */
bReq.nodesToBrowse[0].resultMask = UA_BROWSERESULTMASK_ALL; /* return everything */
UA_BrowseResponse bResp = UA_Client_Service_browse(client, bReq);
printf("%-9s %-16s %-16s %-16s\n", "NAMESPACE", "NODEID", "BROWSE NAME", "DISPLAY NAME");
for(size_t i = 0; i < bResp.resultsSize; ++i) {
for(size_t j = 0; j < bResp.results[i].referencesSize; ++j) {
UA_ReferenceDescription *ref = &(bResp.results[i].references[j]);
if(ref->nodeId.nodeId.identifierType == UA_NODEIDTYPE_NUMERIC) {
printf("%-9d %-16d %-16.*s %-16.*s\n", ref->nodeId.nodeId.namespaceIndex,
ref->nodeId.nodeId.identifier.numeric, (int)ref->browseName.name.length,
ref->browseName.name.data, (int)ref->displayName.text.length,
ref->displayName.text.data);
} else if(ref->nodeId.nodeId.identifierType == UA_NODEIDTYPE_STRING) {
printf("%-9d %-16.*s %-16.*s %-16.*s\n", ref->nodeId.nodeId.namespaceIndex,
(int)ref->nodeId.nodeId.identifier.string.length,
ref->nodeId.nodeId.identifier.string.data,
(int)ref->browseName.name.length, ref->browseName.name.data,
(int)ref->displayName.text.length, ref->displayName.text.data);
}
/* TODO: distinguish further types */
}
}
UA_BrowseRequest_clear(&bReq);
UA_BrowseResponse_clear(&bResp);
/* Same thing, this time using the node iterator... */
UA_NodeId *parent = UA_NodeId_new();
*parent = UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER);
UA_Client_forEachChildNodeCall(client, UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER),
nodeIter, (void *) parent);
UA_NodeId_delete(parent);
#ifdef UA_ENABLE_SUBSCRIPTIONS
/* Create a subscription */
UA_CreateSubscriptionRequest request = UA_CreateSubscriptionRequest_default();
UA_CreateSubscriptionResponse response = UA_Client_Subscriptions_create(client, request,
NULL, NULL, NULL);
UA_UInt32 subId = response.subscriptionId;
if(response.responseHeader.serviceResult == UA_STATUSCODE_GOOD)
printf("Create subscription succeeded, id %u\n", subId);
UA_MonitoredItemCreateRequest monRequest =
UA_MonitoredItemCreateRequest_default(UA_NODEID_STRING(1, "the.answer"));
UA_MonitoredItemCreateResult monResponse =
UA_Client_MonitoredItems_createDataChange(client, response.subscriptionId,
UA_TIMESTAMPSTORETURN_BOTH,
monRequest, NULL, handler_TheAnswerChanged, NULL);
if(monResponse.statusCode == UA_STATUSCODE_GOOD)
printf("Monitoring 'the.answer', id %u\n", monResponse.monitoredItemId);
/* The first publish request should return the initial value of the variable */
UA_Client_run_iterate(client, 1000);
#endif
/* Read attribute */
UA_Int32 value = 0;
printf("\nReading the value of node (1, \"the.answer\"):\n");
UA_Variant *val = UA_Variant_new();
retval = UA_Client_readValueAttribute(client, UA_NODEID_STRING(1, "the.answer"), val);
if(retval == UA_STATUSCODE_GOOD && UA_Variant_isScalar(val) &&
val->type == &UA_TYPES[UA_TYPES_INT32]) {
value = *(UA_Int32*)val->data;
printf("the value is: %i\n", value);
}
UA_Variant_delete(val);
/* Write node attribute */
value++;
printf("\nWriting a value of node (1, \"the.answer\"):\n");
UA_WriteRequest wReq;
UA_WriteRequest_init(&wReq);
wReq.nodesToWrite = UA_WriteValue_new();
wReq.nodesToWriteSize = 1;
wReq.nodesToWrite[0].nodeId = UA_NODEID_STRING_ALLOC(1, "the.answer");
wReq.nodesToWrite[0].attributeId = UA_ATTRIBUTEID_VALUE;
wReq.nodesToWrite[0].value.hasValue = true;
wReq.nodesToWrite[0].value.value.type = &UA_TYPES[UA_TYPES_INT32];
wReq.nodesToWrite[0].value.value.storageType = UA_VARIANT_DATA_NODELETE; /* do not free the integer on deletion */
wReq.nodesToWrite[0].value.value.data = &value;
UA_WriteResponse wResp = UA_Client_Service_write(client, wReq);
if(wResp.responseHeader.serviceResult == UA_STATUSCODE_GOOD)
printf("the new value is: %i\n", value);
UA_WriteRequest_clear(&wReq);
UA_WriteResponse_clear(&wResp);
/* Write node attribute (using the highlevel API) */
value++;
UA_Variant *myVariant = UA_Variant_new();
UA_Variant_setScalarCopy(myVariant, &value, &UA_TYPES[UA_TYPES_INT32]);
UA_Client_writeValueAttribute(client, UA_NODEID_STRING(1, "the.answer"), myVariant);
UA_Variant_delete(myVariant);
#ifdef UA_ENABLE_SUBSCRIPTIONS
/* Take another look at the.answer */
UA_Client_run_iterate(client, 100);
/* Delete the subscription */
if(UA_Client_Subscriptions_deleteSingle(client, subId) == UA_STATUSCODE_GOOD)
printf("Subscription removed\n");
#endif
#ifdef UA_ENABLE_METHODCALLS
/* Call a remote method */
UA_Variant input;
UA_String argString = UA_STRING("Hello Server");
UA_Variant_init(&input);
UA_Variant_setScalarCopy(&input, &argString, &UA_TYPES[UA_TYPES_STRING]);
size_t outputSize;
UA_Variant *output;
retval = UA_Client_call(client, UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER),
UA_NODEID_NUMERIC(1, 62541), 1, &input, &outputSize, &output);
if(retval == UA_STATUSCODE_GOOD) {
printf("Method call was successful, and %lu returned values available.\n",
(unsigned long)outputSize);
UA_Array_delete(output, outputSize, &UA_TYPES[UA_TYPES_VARIANT]);
} else {
printf("Method call was unsuccessful, and %x returned values available.\n", retval);
}
UA_Variant_clear(&input);
#endif
#ifdef UA_ENABLE_NODEMANAGEMENT
/* Add new nodes*/
/* New ReferenceType */
UA_NodeId ref_id;
UA_ReferenceTypeAttributes ref_attr = UA_ReferenceTypeAttributes_default;
ref_attr.displayName = UA_LOCALIZEDTEXT("en-US", "NewReference");
ref_attr.description = UA_LOCALIZEDTEXT("en-US", "References something that might or might not exist");
ref_attr.inverseName = UA_LOCALIZEDTEXT("en-US", "IsNewlyReferencedBy");
retval = UA_Client_addReferenceTypeNode(client,
UA_NODEID_NUMERIC(1, 12133),
UA_NODEID_NUMERIC(0, UA_NS0ID_ORGANIZES),
UA_NODEID_NUMERIC(0, UA_NS0ID_HASSUBTYPE),
UA_QUALIFIEDNAME(1, "NewReference"),
ref_attr, &ref_id);
if(retval == UA_STATUSCODE_GOOD )
printf("Created 'NewReference' with numeric NodeID %u\n", ref_id.identifier.numeric);
/* New ObjectType */
UA_NodeId objt_id;
UA_ObjectTypeAttributes objt_attr = UA_ObjectTypeAttributes_default;
objt_attr.displayName = UA_LOCALIZEDTEXT("en-US", "TheNewObjectType");
objt_attr.description = UA_LOCALIZEDTEXT("en-US", "Put innovative description here");
retval = UA_Client_addObjectTypeNode(client,
UA_NODEID_NUMERIC(1, 12134),
UA_NODEID_NUMERIC(0, UA_NS0ID_BASEOBJECTTYPE),
UA_NODEID_NUMERIC(0, UA_NS0ID_HASSUBTYPE),
UA_QUALIFIEDNAME(1, "NewObjectType"),
objt_attr, &objt_id);
if(retval == UA_STATUSCODE_GOOD)
printf("Created 'NewObjectType' with numeric NodeID %u\n", objt_id.identifier.numeric);
/* New Object */
UA_NodeId obj_id;
UA_ObjectAttributes obj_attr = UA_ObjectAttributes_default;
obj_attr.displayName = UA_LOCALIZEDTEXT("en-US", "TheNewGreatNode");
obj_attr.description = UA_LOCALIZEDTEXT("de-DE", "Hier koennte Ihre Webung stehen!");
retval = UA_Client_addObjectNode(client,
UA_NODEID_NUMERIC(1, 0),
UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER),
UA_NODEID_NUMERIC(0, UA_NS0ID_ORGANIZES),
UA_QUALIFIEDNAME(1, "TheGreatNode"),
UA_NODEID_NUMERIC(1, 12134),
obj_attr, &obj_id);
if(retval == UA_STATUSCODE_GOOD )
printf("Created 'NewObject' with numeric NodeID %u\n", obj_id.identifier.numeric);
/* New Integer Variable */
UA_NodeId var_id;
UA_VariableAttributes var_attr = UA_VariableAttributes_default;
var_attr.displayName = UA_LOCALIZEDTEXT("en-US", "TheNewVariableNode");
var_attr.description =
UA_LOCALIZEDTEXT("en-US", "This integer is just amazing - it has digits and everything.");
UA_Int32 int_value = 1234;
/* This does not copy the value */
UA_Variant_setScalar(&var_attr.value, &int_value, &UA_TYPES[UA_TYPES_INT32]);
var_attr.dataType = UA_TYPES[UA_TYPES_INT32].typeId;
retval = UA_Client_addVariableNode(client,
UA_NODEID_NUMERIC(1, 0), // Assign new/random NodeID
UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER),
UA_NODEID_NUMERIC(0, UA_NS0ID_ORGANIZES),
UA_QUALIFIEDNAME(0, "VariableNode"),
UA_NODEID_NULL, // no variable type
var_attr, &var_id);
if(retval == UA_STATUSCODE_GOOD )
printf("Created 'NewVariable' with numeric NodeID %u\n", var_id.identifier.numeric);
#endif
UA_Client_disconnect(client);
UA_Client_delete(client);
return EXIT_SUCCESS;
}