static UA_StatusCode
setMonitoredItemSettings(UA_Server *server, UA_MonitoredItem *mon,
UA_MonitoringMode monitoringMode,
const UA_MonitoringParameters *params,
const UA_DataType* dataType) {
/* Filter */
if(params->filter.encoding != UA_EXTENSIONOBJECT_DECODED) {
UA_DataChangeFilter_init(&(mon->filter.dataChangeFilter));
mon->filter.dataChangeFilter.trigger = UA_DATACHANGETRIGGER_STATUSVALUE;
} else if(params->filter.content.decoded.type == &UA_TYPES[UA_TYPES_DATACHANGEFILTER]) {
UA_DataChangeFilter *filter = (UA_DataChangeFilter *)params->filter.content.decoded.data;
// TODO implement EURange to support UA_DEADBANDTYPE_PERCENT
switch(filter->deadbandType) {
case UA_DEADBANDTYPE_NONE:
break;
case UA_DEADBANDTYPE_ABSOLUTE:
if(!dataType || !UA_DataType_isNumeric(dataType))
return UA_STATUSCODE_BADFILTERNOTALLOWED;
break;
case UA_DEADBANDTYPE_PERCENT:
return UA_STATUSCODE_BADMONITOREDITEMFILTERUNSUPPORTED;
default:
return UA_STATUSCODE_BADMONITOREDITEMFILTERUNSUPPORTED;
}
UA_DataChangeFilter_copy(filter, &mon->filter.dataChangeFilter);
#ifdef UA_ENABLE_SUBSCRIPTIONS_EVENTS
} else if (params->filter.content.decoded.type == &UA_TYPES[UA_TYPES_EVENTFILTER]) {
UA_EventFilter_copy((UA_EventFilter *)params->filter.content.decoded.data,
&mon->filter.eventFilter);
#endif
} else {
return UA_STATUSCODE_BADMONITOREDITEMFILTERINVALID;
}
/* <-- The point of no return --> */
/* Unregister the callback */
UA_MonitoredItem_unregisterSampleCallback(server, mon);
/* Remove the old samples */
UA_ByteString_deleteMembers(&mon->lastSampledValue);
UA_Variant_deleteMembers(&mon->lastValue);
/* ClientHandle */
mon->clientHandle = params->clientHandle;
/* SamplingInterval */
UA_Double samplingInterval = params->samplingInterval;
if(mon->attributeId == UA_ATTRIBUTEID_VALUE) {
mon->monitoredItemType = UA_MONITOREDITEMTYPE_CHANGENOTIFY;
const UA_VariableNode *vn = (const UA_VariableNode *)
UA_Nodestore_get(server, &mon->monitoredNodeId);
if(vn) {
if(vn->nodeClass == UA_NODECLASS_VARIABLE &&
samplingInterval < vn->minimumSamplingInterval)
samplingInterval = vn->minimumSamplingInterval;
UA_Nodestore_release(server, (const UA_Node *)vn);
}
} else if(mon->attributeId == UA_ATTRIBUTEID_EVENTNOTIFIER) {
/* TODO: events should not need a samplinginterval */
samplingInterval = 10000.0f; // 10 seconds to reduce the load
mon->monitoredItemType = UA_MONITOREDITEMTYPE_EVENTNOTIFY;
} else {
mon->monitoredItemType = UA_MONITOREDITEMTYPE_CHANGENOTIFY;
}
mon->samplingInterval = samplingInterval;
UA_BOUNDEDVALUE_SETWBOUNDS(server->config.samplingIntervalLimits,
samplingInterval, mon->samplingInterval);
if(samplingInterval != samplingInterval) /* Check for nan */
mon->samplingInterval = server->config.samplingIntervalLimits.min;
UA_assert(mon->monitoredItemType != 0);
/* QueueSize */
UA_BOUNDEDVALUE_SETWBOUNDS(server->config.queueSizeLimits,
params->queueSize, mon->maxQueueSize);
/* DiscardOldest */
mon->discardOldest = params->discardOldest;
/* Register sample callback if reporting is enabled */
mon->monitoringMode = monitoringMode;
if(monitoringMode == UA_MONITORINGMODE_REPORTING)
return UA_MonitoredItem_registerSampleCallback(server, mon);
return UA_STATUSCODE_GOOD;
}
/* When a change is detected, encoding contains the heap-allocated binary
* encoded value. The default for changed is false. */
static UA_StatusCode
detectValueChangeWithFilter(UA_Server *server, UA_MonitoredItem *mon, UA_DataValue *value,
UA_ByteString *encoding, UA_Boolean *changed) {
if(UA_DataType_isNumeric(value->value.type) &&
(mon->filter.dataChangeFilter.trigger == UA_DATACHANGETRIGGER_STATUSVALUE ||
mon->filter.dataChangeFilter.trigger == UA_DATACHANGETRIGGER_STATUSVALUETIMESTAMP)) {
if(mon->filter.dataChangeFilter.deadbandType == UA_DEADBANDTYPE_ABSOLUTE) {
if(!updateNeededForFilteredValue(&value->value, &mon->lastValue,
mon->filter.dataChangeFilter.deadbandValue))
return UA_STATUSCODE_GOOD;
}
#ifdef UA_ENABLE_DA
else if(mon->filter.dataChangeFilter.deadbandType == UA_DEADBANDTYPE_PERCENT) {
UA_QualifiedName qn = UA_QUALIFIEDNAME(0, "EURange");
UA_BrowsePathResult bpr = UA_Server_browseSimplifiedBrowsePath(server, mon->monitoredNodeId, 1, &qn);
if(bpr.statusCode != UA_STATUSCODE_GOOD || bpr.targetsSize < 1) { //if branch is not entried, property has been found
UA_BrowsePathResult_deleteMembers(&bpr);
return UA_STATUSCODE_GOOD;
}
const UA_VariableNode* node =
(const UA_VariableNode*) UA_Nodestore_getNode(server->nsCtx, &bpr.targets->targetId.nodeId);
UA_Range* euRange = (UA_Range*) node->value.data.value.value.data;
if(!updateNeededForFilteredPercentValue(&value->value, &mon->lastValue,
mon->filter.dataChangeFilter.deadbandValue, euRange)) {
if(!updateNeededForStatusCode(value, mon)) //when same value, but different status code is written
return UA_STATUSCODE_GOOD;
}
}
#endif
}
/* Stack-allocate some memory for the value encoding. We might heap-allocate
* more memory if needed. This is just enough for scalars and small
* structures. */
UA_STACKARRAY(UA_Byte, stackValueEncoding, UA_VALUENCODING_MAXSTACK);
UA_ByteString valueEncoding;
valueEncoding.data = stackValueEncoding;
valueEncoding.length = UA_VALUENCODING_MAXSTACK;
/* Encode the value */
UA_Byte *bufPos = valueEncoding.data;
const UA_Byte *bufEnd = &valueEncoding.data[valueEncoding.length];
UA_StatusCode retval = UA_encodeBinary(value, &UA_TYPES[UA_TYPES_DATAVALUE],
&bufPos, &bufEnd, NULL, NULL);
if(retval == UA_STATUSCODE_BADENCODINGERROR) {
size_t binsize = UA_calcSizeBinary(value, &UA_TYPES[UA_TYPES_DATAVALUE]);
if(binsize == 0)
return UA_STATUSCODE_BADENCODINGERROR;
if(binsize > UA_VALUENCODING_MAXSTACK) {
retval = UA_ByteString_allocBuffer(&valueEncoding, binsize);
if(retval == UA_STATUSCODE_GOOD) {
bufPos = valueEncoding.data;
bufEnd = &valueEncoding.data[valueEncoding.length];
retval = UA_encodeBinary(value, &UA_TYPES[UA_TYPES_DATAVALUE],
&bufPos, &bufEnd, NULL, NULL);
}
}
}
if(retval != UA_STATUSCODE_GOOD) {
if(valueEncoding.data != stackValueEncoding)
UA_ByteString_deleteMembers(&valueEncoding);
return retval;
}
/* Has the value changed? */
valueEncoding.length = (uintptr_t)bufPos - (uintptr_t)valueEncoding.data;
*changed = (!mon->lastSampledValue.data ||
!UA_String_equal(&valueEncoding, &mon->lastSampledValue));
/* No change */
if(!(*changed)) {
if(valueEncoding.data != stackValueEncoding)
UA_ByteString_deleteMembers(&valueEncoding);
return UA_STATUSCODE_GOOD;
}
/* Change detected. Copy encoding on the heap if necessary. */
if(valueEncoding.data == stackValueEncoding)
return UA_ByteString_copy(&valueEncoding, encoding);
*encoding = valueEncoding;
return UA_STATUSCODE_GOOD;
}
