UA_StatusCode
__UA_Client_readAttribute(UA_Client *client, const UA_NodeId *nodeId, UA_AttributeId attributeId,
void *out, const UA_DataType *outDataType) {
UA_ReadValueId item;
UA_ReadValueId_init(&item);
item.nodeId = *nodeId;
item.attributeId = attributeId;
UA_ReadRequest request;
UA_ReadRequest_init(&request);
request.nodesToRead = &item;
request.nodesToReadSize = 1;
UA_ReadResponse response = UA_Client_Service_read(client, request);
UA_StatusCode retval = response.responseHeader.serviceResult;
if(retval == UA_STATUSCODE_GOOD && response.resultsSize != 1)
retval = UA_STATUSCODE_BADUNEXPECTEDERROR;
if(retval != UA_STATUSCODE_GOOD) {
UA_ReadResponse_deleteMembers(&response);
return retval;
}
UA_DataValue *res = response.results;
if(res->hasStatus != UA_STATUSCODE_GOOD)
retval = res->hasStatus;
else if(!res->hasValue || !UA_Variant_isScalar(&res->value))
retval = UA_STATUSCODE_BADUNEXPECTEDERROR;
if(retval != UA_STATUSCODE_GOOD) {
UA_ReadResponse_deleteMembers(&response);
return retval;
}
if(attributeId == UA_ATTRIBUTEID_VALUE) {
memcpy(out, &res->value, sizeof(UA_Variant));
UA_Variant_init(&res->value);
} else if(UA_Variant_isScalar(&res->value) &&
res->value.type == outDataType) {
memcpy(out, res->value.data, res->value.type->memSize);
UA_free(res->value.data);
res->value.data = NULL;
} else {
retval = UA_STATUSCODE_BADUNEXPECTEDERROR;
}
UA_ReadResponse_deleteMembers(&response);
return retval;
}
UA_StatusCode
UA_Client_readArrayDimensionsAttribute(UA_Client *client, const UA_NodeId nodeId,
UA_Int32 **outArrayDimensions, size_t *outArrayDimensionsSize) {
UA_ReadValueId item;
UA_ReadValueId_init(&item);
item.nodeId = nodeId;
item.attributeId = UA_ATTRIBUTEID_ARRAYDIMENSIONS;
UA_ReadRequest request;
UA_ReadRequest_init(&request);
request.nodesToRead = &item;
request.nodesToReadSize = 1;
UA_ReadResponse response = UA_Client_Service_read(client, request);
UA_StatusCode retval = response.responseHeader.serviceResult;
if(retval == UA_STATUSCODE_GOOD && response.resultsSize != 1)
retval = UA_STATUSCODE_BADUNEXPECTEDERROR;
if(retval != UA_STATUSCODE_GOOD)
goto cleanup;
UA_DataValue *res = response.results;
if(res->hasStatus != UA_STATUSCODE_GOOD)
retval = res->hasStatus;
else if(!res->hasValue || UA_Variant_isScalar(&res->value))
retval = UA_STATUSCODE_BADUNEXPECTEDERROR;
if(retval != UA_STATUSCODE_GOOD)
goto cleanup;
if(UA_Variant_isScalar(&res->value) ||
res->value.type != &UA_TYPES[UA_TYPES_INT32]) {
retval = UA_STATUSCODE_BADUNEXPECTEDERROR;
goto cleanup;
}
*outArrayDimensions = res->value.data;
*outArrayDimensionsSize = res->value.arrayLength;
UA_free(res->value.data);
res->value.data = NULL;
res->value.arrayLength = 0;
cleanup:
UA_ReadResponse_deleteMembers(&response);
return retval;
}
UA_StatusCode
UA_Client_NamespaceGetIndex(UA_Client *client, UA_String *namespaceUri, UA_UInt16 *namespaceIndex) {
UA_ReadRequest request;
UA_ReadRequest_init(&request);
UA_ReadValueId id;
id.attributeId = UA_ATTRIBUTEID_VALUE;
id.nodeId = UA_NODEID_NUMERIC(0, UA_NS0ID_SERVER_NAMESPACEARRAY);
request.nodesToRead = &id;
request.nodesToReadSize = 1;
UA_ReadResponse response = UA_Client_Service_read(client, request);
UA_StatusCode retval = UA_STATUSCODE_GOOD;
if(response.responseHeader.serviceResult != UA_STATUSCODE_GOOD)
retval = response.responseHeader.serviceResult;
else if(response.resultsSize != 1 || !response.results[0].hasValue)
retval = UA_STATUSCODE_BADNODEATTRIBUTESINVALID;
else if(response.results[0].value.type != &UA_TYPES[UA_TYPES_STRING])
retval = UA_STATUSCODE_BADTYPEMISMATCH;
if(retval != UA_STATUSCODE_GOOD) {
UA_ReadResponse_deleteMembers(&response);
return retval;
}
retval = UA_STATUSCODE_BADNOTFOUND;
UA_String *ns = response.results[0].value.data;
for(size_t i = 0; i < response.results[0].value.arrayLength; i++){
if(UA_String_equal(namespaceUri, &ns[i])) {
*namespaceIndex = (UA_UInt16)i;
retval = UA_STATUSCODE_GOOD;
break;
}
}
UA_ReadResponse_deleteMembers(&response);
return retval;
}
OV_DLLFNCEXPORT OV_RESULT opcuafb_Read_Execute_set(
OV_INSTPTR_opcuafb_Read pinst,
const OV_BOOL value
) {
OV_INSTPTR_opcuafb_Connect pConnect = NULL;
OV_INSTPTR_opcuafb_NodeGetHandle pNodeGetHandle = NULL;
UA_ReadRequest ReadRequest;
UA_ReadResponse ReadResponse;
unsigned long int tempulong = 0;
char *endPtr = NULL;
if(value == FALSE || pinst->v_Execute == TRUE){
//only react on the rising edge
pinst->v_Execute = value;
return OV_ERR_OK;
}
pConnect = Ov_DynamicPtrCast(opcuafb_Connect, fb_connection_getFirstConnectedObject(Ov_PtrUpCast(fb_object, pinst), FALSE, TRUE, "ConnectionHdl"));
if(pConnect == NULL){
pinst->v_Error = TRUE;
pinst->v_ErrorID = 1; //todo
return OV_ERR_BADVALUE;
}
if(pConnect->v_ConnectionHdl == 0){
pinst->v_Error = TRUE;
pinst->v_ErrorID = 1; //todo
return OV_ERR_BADVALUE;
}
if(pConnect->v_Client == NULL){
//internal error
pinst->v_Error = TRUE;
pinst->v_ErrorID = 1; //todo
return OV_ERR_BADVALUE;
}
pNodeGetHandle = Ov_DynamicPtrCast(opcuafb_NodeGetHandle, fb_connection_getFirstConnectedObject(Ov_PtrUpCast(fb_object, pinst), FALSE, TRUE, "NodeHdl"));
if(pNodeGetHandle == NULL){
pinst->v_Error = TRUE;
pinst->v_ErrorID = 1; //todo
return OV_ERR_BADVALUE;
}
if(pNodeGetHandle->v_NodeHdl == 0){
pinst->v_Error = TRUE;
pinst->v_ErrorID = 1; //todo
return OV_ERR_BADVALUE;
}
//free memory of old ANY variable
if(pinst->v_Variable.value.vartype == OV_VT_STRING){
ov_string_setvalue(&pinst->v_Variable.value.valueunion.val_string, NULL);
pinst->v_Variable.value.vartype = OV_VT_VOID;
}else if(pinst->v_Variable.value.vartype & OV_VT_ISVECTOR){
Ov_SetAnyValue(&pinst->v_Variable, NULL);
}
UA_ReadRequest_init(&ReadRequest);
ReadRequest.nodesToRead = UA_ReadValueId_new();
ReadRequest.nodesToReadSize = 1;
ReadRequest.nodesToRead[0].attributeId = UA_ATTRIBUTEID_VALUE;
if(pNodeGetHandle->v_NodeID.IdentifierType == UA_IDTYPE_STRING){
ReadRequest.nodesToRead[0].nodeId = UA_NODEID_STRING_ALLOC(pNodeGetHandle->v_NodeID.NamespaceIndex, pNodeGetHandle->v_NodeID.Identifier);
}else if(pNodeGetHandle->v_NodeID.IdentifierType == UA_IDTYPE_NUMERIC){
tempulong = strtoul(pNodeGetHandle->v_NodeID.Identifier, &endPtr, 10);
if (ERANGE != errno &&
tempulong < UINT16_MAX &&
endPtr != pNodeGetHandle->v_NodeID.Identifier)
{
ReadRequest.nodesToRead[0].nodeId = UA_NODEID_NUMERIC(pNodeGetHandle->v_NodeID.NamespaceIndex, (UA_UInt16)tempulong);
}
// }else if(pNodeGetHandle->v_NodeID.IdentifierType == UA_IDTYPE_GUID){
//todo
//ReadRequest.nodesToRead[0].nodeId = UA_NODEID_GUID(pNodeGetHandle->v_NodeID.NamespaceIndex, pNodeGetHandle->v_NodeID.Identifier);
}else{
UA_ReadRequest_deleteMembers(&ReadRequest);
return OV_ERR_BADVALUE;
}
ReadResponse = UA_Client_Service_read(pConnect->v_Client, ReadRequest);
if(ReadResponse.responseHeader.serviceResult == UA_STATUSCODE_GOOD &&
ReadResponse.resultsSize > 0 && ReadResponse.results[0].hasValue){
pinst->v_Error = FALSE;
pinst->v_ErrorID = 0;
pinst->v_Done = TRUE;
if(UA_Variant_isScalar(&ReadResponse.results[0].value)){
if(ReadResponse.results[0].hasSourceTimestamp){
pinst->v_TimeStamp = ov_1601nsTimeToOvTime(ReadResponse.results[0].sourceTimestamp);
//todo }else if(ReadResponse.results[0].hasSourcePicoseconds){
}else if(ReadResponse.results[0].hasServerTimestamp){
pinst->v_TimeStamp = ov_1601nsTimeToOvTime(ReadResponse.results[0].sourceTimestamp);
//todo }else if(ReadResponse.results[0].hasServerPicoseconds){
}else{
ov_time_gettime(&pinst->v_TimeStamp);
}
if(ReadResponse.results[0].value.type == &UA_TYPES[UA_TYPES_INT32]){
pinst->v_Variable.value.vartype = OV_VT_INT;
pinst->v_Variable.value.valueunion.val_int = (OV_INT)*(UA_Int32*)ReadResponse.results[0].value.data;
}else if(ReadResponse.results[0].value.type == &UA_TYPES[UA_TYPES_UINT32]){
pinst->v_Variable.value.vartype = OV_VT_UINT;
pinst->v_Variable.value.valueunion.val_uint = (OV_UINT)*(UA_UInt32*)ReadResponse.results[0].value.data;
}else if(ReadResponse.results[0].value.type == &UA_TYPES[UA_TYPES_FLOAT]){
pinst->v_Variable.value.vartype = OV_VT_SINGLE;
pinst->v_Variable.value.valueunion.val_single = (OV_SINGLE)*(UA_Float*)ReadResponse.results[0].value.data;
}else if(ReadResponse.results[0].value.type == &UA_TYPES[UA_TYPES_DOUBLE]){
pinst->v_Variable.value.vartype = OV_VT_DOUBLE;
pinst->v_Variable.value.valueunion.val_double = (OV_DOUBLE)*(UA_Double*)ReadResponse.results[0].value.data;
}else if(ReadResponse.results[0].value.type == &UA_TYPES[UA_TYPES_STRING]){
pinst->v_Variable.value.vartype = OV_VT_STRING;
pinst->v_Variable.value.valueunion.val_string = Ov_DbMalloc(((UA_String*)ReadResponse.results[0].value.data)->length);
if(pinst->v_Variable.value.valueunion.val_string != NULL){
memcpy(((UA_String*)ReadResponse.results[0].value.data)->data, pinst->v_Variable.value.valueunion.val_string, ((UA_String*)ReadResponse.results[0].value.data)->length);
}
}else if(ReadResponse.results[0].value.type == &UA_TYPES[UA_TYPES_DATETIME]){
pinst->v_Variable.value.vartype = OV_VT_TIME;
pinst->v_Variable.value.valueunion.val_time = ov_1601nsTimeToOvTime((OV_INT64)*(UA_DateTime*)ReadResponse.results[0].value.data);
}else{
if(ReadResponse.results[0].value.type == &UA_TYPES[UA_TYPES_STRING]){
//free memory
Ov_SetAnyValue(&pinst->v_Variable, NULL);
//set length and type
Ov_SetDynamicVectorLength(&pinst->v_Variable.value.valueunion.val_string_vec, ReadResponse.results[0].value.arrayLength, STRING);
for(size_t iterator = 0; iterator < ReadResponse.results[0].value.arrayLength;iterator++){
pinst->v_Variable.value.valueunion.val_string = Ov_DbMalloc(((UA_String*)ReadResponse.results[0].value.data)[iterator].length);
if(pinst->v_Variable.value.valueunion.val_string != NULL){
memcpy(((UA_String*)ReadResponse.results[0].value.data)[iterator].data, pinst->v_Variable.value.valueunion.val_string_vec.value[iterator], ((UA_String*)ReadResponse.results[0].value.data)[iterator].length);
}
}
}else{
//not implemented
pinst->v_Done = TRUE;
pinst->v_Error = TRUE;
pinst->v_ErrorID = 1; //todo
}
}
}else{
//not implemented
pinst->v_Done = TRUE;
pinst->v_Error = TRUE;
pinst->v_ErrorID = 1; //todo
}
}else{
pinst->v_Done = FALSE;
pinst->v_Error = TRUE;
pinst->v_ErrorID = 1; //todo
}
UA_ReadResponse_deleteMembers(&ReadResponse);
UA_ReadRequest_deleteMembers(&ReadRequest);
pinst->v_Execute = value;
return OV_ERR_OK;
}
int main(int argc, char *argv[]) {
UA_Client *client = UA_Client_new(UA_ClientConfig_standard, Logger_Stdout);
UA_StatusCode retval = UA_Client_connect(client, ClientNetworkLayerTCP_connect,
"opc.tcp://localhost:16664");
if(retval != UA_STATUSCODE_GOOD) {
UA_Client_delete(client);
return retval;
}
// 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->browseName.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->browseName.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_deleteMembers(&bReq);
UA_BrowseResponse_deleteMembers(&bResp);
#ifdef ENABLE_SUBSCRIPTIONS
// Create a subscription with interval 0 (immediate)...
UA_UInt32 subId;
UA_Client_Subscriptions_new(client, UA_SubscriptionSettings_standard, &subId);
if(subId)
printf("Create subscription succeeded, id %u\n", subId);
// .. and monitor TheAnswer
UA_NodeId monitorThis = UA_NODEID_STRING(1, "the.answer");
UA_UInt32 monId;
UA_Client_Subscriptions_addMonitoredItem(client, subId, monitorThis,
UA_ATTRIBUTEID_VALUE, &handler_TheAnswerChanged, NULL, &monId);
if (monId)
printf("Monitoring 'the.answer', id %u\n", subId);
// First Publish always generates data (current value) and call out handler.
UA_Client_Subscriptions_manuallySendPublishRequest(client);
// This should not generate anything
UA_Client_Subscriptions_manuallySendPublishRequest(client);
#endif
UA_Int32 value = 0;
// Read node's value
printf("\nReading the value of node (1, \"the.answer\"):\n");
UA_ReadRequest rReq;
UA_ReadRequest_init(&rReq);
rReq.nodesToRead = UA_ReadValueId_new();
rReq.nodesToReadSize = 1;
rReq.nodesToRead[0].nodeId = UA_NODEID_STRING_ALLOC(1, "the.answer"); /* assume this node exists */
rReq.nodesToRead[0].attributeId = UA_ATTRIBUTEID_VALUE;
UA_ReadResponse rResp = UA_Client_Service_read(client, rReq);
if(rResp.responseHeader.serviceResult == UA_STATUSCODE_GOOD &&
rResp.resultsSize > 0 && rResp.results[0].hasValue &&
UA_Variant_isScalar(&rResp.results[0].value) &&
rResp.results[0].value.type == &UA_TYPES[UA_TYPES_INT32]) {
value = *(UA_Int32*)rResp.results[0].value.data;
printf("the value is: %i\n", value);
}
UA_ReadRequest_deleteMembers(&rReq);
UA_ReadResponse_deleteMembers(&rResp);
value++;
// Write node's 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"); /* assume this node exists */
wReq.nodesToWrite[0].attributeId = UA_ATTRIBUTEID_VALUE;
wReq.nodesToWrite[0].value.hasValue = UA_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_deleteMembers(&wReq);
UA_WriteResponse_deleteMembers(&wResp);
#ifdef ENABLE_SUBSCRIPTIONS
// Take another look at the.answer... this should call the handler.
UA_Client_Subscriptions_manuallySendPublishRequest(client);
// Delete our subscription (which also unmonitors all items)
if(!UA_Client_Subscriptions_remove(client, subId))
printf("Subscription removed\n");
#endif
#ifdef ENABLE_METHODCALLS
/* Note: This example requires Namespace 0 Node 11489 (ServerType -> GetMonitoredItems)
FIXME: Provide a namespace 0 independant example on the server side
*/
UA_Variant input;
UA_String argString = UA_STRING("Hello Server");
UA_Variant_init(&input);
UA_Variant_setScalarCopy(&input, &argString, &UA_TYPES[UA_TYPES_STRING]);
UA_Int32 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 successfull, and %i returned values available.\n", outputSize);
UA_Array_delete(output, outputSize, &UA_TYPES[UA_TYPES_VARIANT]);
} else {
printf("Method call was unsuccessfull, and %x returned values available.\n", retval);
}
UA_Variant_deleteMembers(&input);
#endif
#ifdef ENABLE_NODEMANAGEMENT
/* New ReferenceType */
UA_NodeId ref_id;
UA_ReferenceTypeAttributes ref_attr;
UA_ReferenceTypeAttributes_init(&ref_attr);
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_init(&objt_attr);
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_ORGANIZES),
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_init(&obj_attr);
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_init(&var_attr);
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 UA_STATUSCODE_GOOD;
}
int main(void)
{
UA_Client *clt; //client
UA_StatusCode retval;
UA_ReadRequest req; //read request
UA_ReadResponse resp; //response
/*
* Step 1.
* create & init the client
*/
clt = UA_Client_new(UA_ClientConfig_standard);
retval = UA_Client_connect(clt, URL);
if(retval != UA_STATUSCODE_GOOD){
UA_Client_delete(clt);
return retval;
}
/*
* Step 2.
* Create read request
*/
UA_ReadRequest_init(&req); // memset 0 in req
req.nodesToRead = UA_Array_new(1, &UA_TYPES[UA_TYPES_READVALUEID]);
req.nodesToReadSize = 1;
/*
* Step 3.
* define which node and attribute to be read
*/
req.nodesToRead[0].nodeId = UA_NODEID_STRING_ALLOC(1, "the.f****r");
req.nodesToRead[0].attributeId = UA_ATTRIBUTEID_VALUE;
/*
* Step 4.
* call the `UA_Client_Service_read` to read
*/
UA_ReadResponse_init(&resp);
resp = UA_Client_Service_read(clt, req);
/* if(resp.responseHeader.serviceResult == UA_STATUSCODE_GOOD &&
resp.resultsSize > 0 &&
resp.results[0].hasValue &&
UA_Variant_isScalar(&resp.results[0].value) &&
resp.results[0].value.type == &UA_TYPES[UA_TYPES_INT32])
{*/
if(resp.responseHeader.serviceResult == UA_STATUSCODE_GOOD &&
resp.resultsSize > 0 &&
resp.results[0].hasValue &&
UA_Variant_isScalar(&resp.results[0].value) &&
resp.results[0].value.type == &UA_TYPES[UA_TYPES_STRING])
{
UA_String *str = (UA_String *)resp.results[0].value.data;
printf("The string : %s\n", str->data);
/*
UA_Int32 *val = (UA_Int32 *)resp.results[0].value.data;
printf("The value is: %d\n", *val);*/
}
/*
* Step 5.
* free resource
*/
UA_ReadRequest_deleteMembers(&req);
UA_ReadResponse_deleteMembers(&resp);
UA_Client_disconnect(clt);
UA_Client_delete(clt);
return UA_STATUSCODE_GOOD;
}