Historizing a variable

[Jacky Bek]

I read that it is possible to create a node and make it 'history-capable'.

Is there any sample code?

[Jan Hecht]

I haven't tried it yet, but maybe you have a look into this:

https://github.com/open62541/open62541/blob/master/examples/tutorial_server_historicaldata.c

BR,

Jan

[Jacky Bek]

Hi Jan,

Thanks for pointing me to the tutorial - https://github.com/open62541/open62541/blob/master/examples/tutorial_server_historicaldata.c

There are 2 compile error which i don't quite understand:

1.

In file included from myNewServer.c:25:

/usr/include/open62541/plugin/history_database.h:20:19: error: expected declaration specifiers or ‘...’ before ‘UA_HistoryDatabase’

     void (*clear)(UA_HistoryDatabase *hdb);

                   ^~~~~~~~~~~~~~~~~~

2.

myNewServer.c: In function ‘ConnectToAirgard’:

myNewServer.c:2226:10: error: ‘UA_ServerConfig’ {aka ‘struct UA_ServerConfig’} has no member named ‘historyDatabase’

    config->historyDatabase = UA_HistoryDatabase_default(HistoryDataGathering);

In the 2nd error, config is declared as UA_ServerConfig *config = UA_Server_getConfig(server) which is from the standard build.

For the historizing tutorial, it makes a reference to an element 'historyDatabase' which is non existent.

Is there a new structure defined somewhere that inherits the properties from?

Many thanks.

[Jacky Bek]

Hi,

I thought it would be easier to show you my codes and order of the header files as follows.

Initially, I got a compile error complaining : UA_HistoryDatabase not defined.

I then tried to modify open62541.h by adding :

struct UA_HistoryDatabase;

typedef struct UA_HistoryDatabase UA_HistoryDatabase;

it then complain : expected specifier-qualifier-list before typedef.

(see left bottom screen).

The funny thing is further down the file in open62541.h, a similar declaration but it did not complain error:

struct UA_Server;

typedef struct UA_Server UA_Server;

[Jacky Bek]

sorry, the last statement should be:

The funny thing is further down the file in open62541.h, a similar declaration but it did not complain error:

struct UA_Client;

typedef struct UA_Client UA_Client;

I tried to move the header files around (e.g. move historydatabase.h before open62541.h but it introduced more errors).

Please advise how I can go about resolving this circular reference error.

[Jacky Bek]

I manage to compile my code that contains historizing capabilities.

However, I am still getting the following messages within UAExpert when i add a historizing node:

- found session for ServerId 0

- HistoryReadRawModified succeeded

- HistoryReadDataResults[0] has bad status BadHistoryOperationInvalid

- No history values received for node 'NS1|Numeric|10302'

i combed through the documentations relating to Historizing function.  See below:

Did i miss anything?

***********************************************************************************************************************

in SV_StartOPCUAServer.c:, i have the following functions declared:

=========

static UA_Boolean allowHistoryUpdateUpdateData(UA_Server *server, UA_AccessControl *ac,

                const UA_NodeId *sessionId, void *sessionContext,

                const UA_NodeId *nodeId,

                UA_PerformUpdateType performInsertReplace,

                const UA_DataValue *value) {

return true;

}

static UA_Boolean allowHistoryUpdateDeleteRawModified(UA_Server *server, UA_AccessControl *ac,

                const UA_NodeId *sessionId, void *sessionContext,

                const UA_NodeId *nodeId,

                UA_DateTime startTimestamp,

                UA_DateTime endTimestamp,

                bool isDeleteModified) {

return true;

}

=========

In my main() function, i have:

main()

{

UA_Server myServer;

UA_ServerConfig config1;

...

                config1.accessHistoryDataCapability = true;

                config1.maxReturnDataValues = 0 ;  // 0 means unlimited size

                config1.accessHistoryEventsCapability = true;

                config1.maxReturnEventValues = 0;  // 0 means unlimted size

                config1.insertDataCapability = true;

                config1.insertEventCapability = true;

                config1.insertAnnotationsCapability = true;

                config1.replaceDataCapability = true;

                config1.replaceEventCapability = true;

                config1.updateDataCapability = true;

                config1.updateEventCapability = true;

                config1.deleteRawCapability = true;

                config1.deleteEventCapability = true;

                config1.deleteAtTimeDataCapability = true;

                config1.accessControl.allowHistoryUpdateUpdateData = allowHistoryUpdateUpdateData;

                config1.accessControl.allowHistoryUpdateDeleteRawModified = allowHistoryUpdateDeleteRawModified;

CreateOPCUANodes(myServer); // verified ok

CreateServerMethodItems(myServer); // verified ok

CreateServerHistorizingItems(myServer); // error messages shown in UAExpert

CreateServerMonitoredItems(myServer); // server log shows successful

}

==================

In CreateOPCUANodes() function::

---------------------

// In SV_CreateOPCUANodes.c

extern UA_NodeId outIgramPP_Id;

CreateOPCUANodes(myServer)

{

...

UA_VariableAttributes vIgramPPAttr = UA_VariableAttributes_default;

        vIgramPPAttr.description = UA_LOCALIZEDTEXT("en-US", "IgramPPInfo");

        vIgramPPAttr.displayName = UA_LOCALIZEDTEXT("en-US", "01. Igram PP");

        vIgramPPAttr.accessLevel = UA_ACCESSLEVELMASK_READ | UA_ACCESSLEVELMASK_WRITE | UA_ACCESSLEVELMASK_HISTORYREAD;

        vIgramPPAttr.historizing = true;

        //UA_Float IgramPP = (UA_Float) XMLIgramPP;     // value is set in print_element_names

        UA_Variant_setScalar(&vIgramPPAttr.value, &IgramPP, &UA_TYPES[UA_TYPES_FLOAT]);

        UA_Server_addVariableNode(uaServer, UA_NODEID_NUMERIC(1, 10301),        // 1 refers to namespace : NS1

            r2_airgard_diagnostics_Id,

            UA_NODEID_NUMERIC(0, UA_NS0ID_HASPROPERTY),

            UA_QUALIFIEDNAME(1, "Igram PP"),

            UA_NODEID_NUMERIC(0, UA_NS0ID_BASEDATAVARIABLETYPE),

            vIgramPPAttr, NULL, &outIgramPP_Id);

        //vIgramPPAttr, NULL, &ds1IgramPPId);

}

---------------------

In CreateServerHistorizingItems() function::

// In SV_Historizing.c

extern UA_NodeId outIgramPP_Id;

..

void CreateServerHistorizingItems(UA_Server *server)

{

                       size_t initialNodeIdStoreSize = 100000;

                        UA_HistoryDataGathering HistoryDataGathering = UA_HistoryDataGathering_Default(initialNodeIdStoreSize); // initial NodeStore Size = 1

                        UA_ServerConfig *config = UA_Server_getConfig(server);

                        config->historyDatabase = UA_HistoryDatabase_default(HistoryDataGathering);

                        UA_HistorizingNodeIdSettings HistorizingSetting;

                        HistorizingSetting.historizingBackend = UA_HistoryDataBackend_Memory(21, 20); // 21 nodes, 20 values

                        HistorizingSetting.maxHistoryDataResponseSize = 20;

                        HistorizingSetting.pollingInterval = 100;

                        HistorizingSetting.historizingUpdateStrategy = UA_HISTORIZINGUPDATESTRATEGY_POLL;

                        int retval;

                        retval = HistoryDataGathering.registerNodeId(server, HistoryDataGathering.context, &outIgramPP_Id, HistorizingSetting);

                        retval = HistoryDataGathering.registerNodeId(server, HistoryDataGathering.context, &outIgramDC_Id, HistorizingSetting);

                        retval = HistoryDataGathering.registerNodeId(server, HistoryDataGathering.context, &outLaserPP_Id, HistorizingSetting);

                        retval = HistoryDataGathering.registerNodeId(server, HistoryDataGathering.context, &outLaserDC_Id, HistorizingSetting);

                        retval = HistoryDataGathering.registerNodeId(server, HistoryDataGathering.context, &outSingleBeamAt900_Id, HistorizingSetting);

====================

[Jacky Bek]

see attached for easy reference.

1. HistorizingError3.txt - code snippets
2. HistorizingChart.png - screen capture of UAExpert showing error message

[Jacky Bek]

I made some changes to my server code:

Now there is no more errors relating to the instantiation of historizing nodes.

I also added a rand() function to my code to force a change to the value set in the Node in every data update cycle.

I verified using UAExpert that in the 'data access view', the nodeId is correct and the value changes.

But when i drag and drop the same Node to the HistoryTrend View in UAExpert,  the log shows:

1. History Plugin - Found session for ServerId 1

2. History Plugin - HistoryReadRawModified succeeded

3. History Plugin - No history values received for node 'NS1|Numeric|10301'

See the attached code snippets.

For your advice please.

Thanks.

[Jacky Bek]

resolved.