At this time server_end_point.js has a few hardcoded strings in _makeEndpointDescription.:
endpointUrl
server.applicationUri
server.productUri
server.applicationName

Hello i am using Prosys OPC UA client to test the sample server. However it give us the errors:

"""
buffer.js:582
throw new RangeError('Trying to access beyond buffer length');
^
RangeError: Trying to access beyond buffer length
at checkOffset (buffer.js:582:11)
at Buffer.readUInt32LE (buffer.js:609:5)
"""
Can u give me some advice?
Thank you
Best regard,
Long Tran

function constructBrowsePath(startingNode ,path)
exports.constructBrowsePath = constructBrowsePath;

can not use require('node-opcua').AddressSpace constructBrowsePath.

please add:
AddressSpace.prototype.constructBrowsePath = constructBrowsePath;

node simple_client.js
connected !
{ namespaceIndex: 0, name: 'FolderType' }
{ namespaceIndex: 0, name: 'Views' }
{ namespaceIndex: 0, name: 'Objects' }
{ namespaceIndex: 0, name: 'Types' }
MessageBuilder : ERROR DETECTED IN event handler
[Error: String cannot be coerced to a nodeId : S7:S7_Connection_1.db1.0,x0]
Error: String cannot be coerced to a nodeId : S7:S7_Connection_1.db1.0,x0

When CreateMonitoredItemResponse comes with ServiceResult = 0x802b0000, response.results is empty array, and in client_subscription.js at line 229 module checks result[0].StatusCode. Node throw exception:

TypeError: Cannot read property 'statusCode' of undefined  
    at ClientMonitoredItem._monitor (project\node_modules\node-opcua\lib\client\client_subscription.js:229:32)
    at OPCUASession._defaultRequest (project\node_modules\node-opcua\lib\client\opcua_client.js:366:13)
    at Object.OPCUASession.performMessageTransaction (project\node_modules\node-opcua\lib\client\opcua_client.js:552:9)
   ...

at this point err is ‌‌Error: ServiceResult is BadTimestampsToReturnInvalid (0x802b0000)

capture: https://drive.google.com/file/d/0B98-p8X89-Btakt6Z3JxZUZGVjg/edit?usp=sharing

Error disapear when i added
timestampsToReturn: 2,
on line 216 in client_subscription.js

There does not seem to be a way to provide the source time stamp for a variable. How would you prefer to do this API wise if I can help?

'node --use_strict "sample_client.js"' throw error but 'node "sample_client.js"' is OK:

e:\nodejs\global\node_modules\node-opcua\lib\misc\encode_decode.js:119
isValidBoolean = exports.isValidBoolean = function(value) {
^
ReferenceError: isValidBoolean is not defined
at Object. (e:\nodejs\global\node_modules\node-opcua\lib\misc\encode_decode.js:119:16)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:349:32)
at Function.Module._load (module.js:305:12)
at Module.require (module.js:357:17)
at require (module.js:373:17)
at Object. (e:\nodejs\global\node_modules\node-opcua\lib\misc\factories.js:8:10)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)

Hi, I tried to create a simple client. So I started to write some kind of main-Method. After I did the connect, I want to create a session. Unfortunately I got an error:
... \node-opcua\lib\client\opcua_client.js:638
this.serverUri = endpoint.server.applicationUri;
TypeError: Cannot read property 'server' of undefined at OPCUAClient._createSession (... \node_modules\node-opcua\lib\client\opcua_client.js:639:30)
at OPCUAClient.createSession

Here is the corresponding code snippet:

console.log("BP0");
var client      = new opcua.OPCUAClient();
var endpointUrl = "opc.tcp://" + require("os").hostname() + ":48010";
client.connect(endpointUrl, function(err){
    if (err) {
        console.log(" failure ",err);
    } else {
        console.log("done!")
    }
});
console.log("Connected!");
var userIdentityToken = new s.AnonymousIdentityToken({policyId: "0"});
client.createSession(userIdentityToken, function(err, ses){
    if(!err){
        session = ses;
    } else {
        console.log("ERROR 100");
    }
});
console.log("Session created!");
client.disconnect(function(err){
    if (!err){
        console.log("Disconnected!")
    } else {
        console.log("ERROR 101");
    }
});
console.log("Disconnected!");
console.log("BP1");

Could you share an example for subscribing events from A&E server? Thanks.

Your code looks great... thanks for all your hard work in developing this module.
We're looking to potentially use it in an upcoming project of ours, however I have a question/request. From your example documentation, it looks like the only way to return a requested value on the server side is through a synchronous getter such as:

server.nodeVariable1 = server.engine.addVariableInFolder("MyDevice",{
browseName: "MyVariable1",
dataType: "Double",
value: {
get: function () {
return new opcua.Variant({dataType: opcua.DataType.Double, value: variable1 });
}
}
});

However, for our needs (due to wireless latencies and other issues), we will need to asynchronously read this value on the server, and return it via a callback of some sort. Is this functionality planned in the near future, or could you give me some guidance on where to look if you would like us to potentially modify and send a pull request?

Cheers--

server:
[root@py myserver]# node sample_server.js
using URSA
FAST: using node-expat
initialized
LISTENING TO PORT 4334
Server is now listening ... ( press CTRL+C to stop)
port 4334
the primary server endpoint url is opc.tcp://py:4334/UA/SampleServer

client:
[root@py sample_client]# node sample_client.js
using URSA
FAST: using node-expat
cannot connect to endpoint : opc.tcp://py:4334/UA/SampleServer
failure { [Error: getaddrinfo EIO] code: 'EIO', errno: 'EIO', syscall: 'getaddrinfo' }

Great work.

Running simple test:

var http = require('http');
var opcua = require('node-opcua');

http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello World\n');
}).listen(3000, '127.0.0.1');
console.log('Server running at http://127.0.0.1:3000/');

I get out:

../testOPCuaSDK/node-opcua-sample/node_modules/node-opcua/node_modules/better-assert/index.js:37
throw err;
^
AssertionError: offset === 11644473600000
at /home/prjsprod/prjdpsystem/testOPCuaSDK/node-opcua-sample/node_modules/node-opcua/lib/misc/encode_decode.js:231:9
at exports.isValidDateTime (/home/prjsprod/prjdpsystem/testOPCuaSDK/node-opcua-sample/node_modules/node-opcua/lib/misc/encode_decode.js:235:7)
at Object. (/home/prjsprod/prjdpsystem/testOPCuaSDK/node-opcua-sample/node_modules/node-opcua/lib/misc/encode_decode.js:277:2)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object. (/home/prjsprod/prjdpsystem/testOPCuaSDK/node-opcua-sample/node_modules/node-opcua/lib/misc/factories.js:8:10)

If commet line 231 in file 'encode_decode.js'
//assert(offset === 11644473600000);

Out is:
../testOPCuaSDK/node-opcua-sample$ node simple_client.js
FAST: using node-expat
Server running at http://127.0.0.1:3000/

PS: I like help with this project.

Best regards,
Aurélio.

I'm having problems generating a public key on windows.

I do ..

openssl req -x509 -days 365 -nodes -newkey rsa:1024 -keyout key.pem -out cert.pem

then ...

openssl rsa -in cert.pem -pubout > public_key.pub

but it gives me..

unable to load Private Key
7876:error:0906D06C:PEM routines:PEM_read_bio:no start line:.\crypto\pem\pem_lib.c:703:Expecting: ANY PRIVATE KEY

any advice/help would be massively appreciated

In UAExpert i see the attributes are changed realtime. But using this module the on changed event is not fired. Also console.log("keepalive"); is not printed. Somebody have any suggestions? Thank you in advance...

Code that works (getting variable value 1 time):

    function(callback) {
       the_session.readVariableValue("ns=2;s=WINDSAMP/Variables/fWindspeed1_1s_var", function(err,dataValues) {
           if (!err) {
               console.log(" Winddirection 1 = " , dataValues);
           }
           callback(err);
       });
    }

Code that does not work:

    function(callback) {
       the_subscription=new opcua.ClientSubscription(the_session,{
           requestedPublishingInterval: 500,
           requestedLifetimeCount: 1000,
           requestedMaxKeepAliveCount: 10,
           maxNotificationsPerPublish: 10,
           publishingEnabled: true,
           priority: 0
       });

       the_subscription.on("started",function(){
           console.log("subscription started for 2 seconds - subscriptionId=",the_subscription.subscriptionId);
       }).on("keepalive",function(){
           console.log("keepalive");
       }).on("terminated",function(){
           callback();
       });

       setTimeout(function(){
           the_subscription.terminate();
       },10000);

        var monitoredItem  = the_subscription.monitor({
              nodeId: opcua.resolveNodeId("ns=2;s=WINDSAMP/Variables/fWindspeed1_1s_var"),
              attributeId: 13
          },
          {
              samplingInterval: 100,
              discardOldest: true,
              queueSize: 10
          },
          opcua.read_service.TimestampsToReturn.Both
        );   

        console.log("-------------------------------------");

       monitoredItem.on("changed",function(dataValue){
          console.log(" Windspeed = ",dataValue.value.value);
       });

    },

Hi,

currently I am playing around with node crawler. I would like to browse through all nodes and fill an object with the hierachy of all browsed nodes. Summing up, I try to build the tree of i.e. UAExpert in nodejs-opcua. Any ideas or code snippets how to solve this issue?

Hello. I am new to the opcUA.
I am doing a small change in the sample client which just try to read the "MyVariable1" from the sample server.
I changed "ns=4,s="free_mem" to "ns=1,s="1001".
The change come from reading data from UAExpert application. I guessed that i should change this.

The result is just "keep alive" or there is no variable found.

Could you please tell me how can i read the NodeID and Attribute ?.
Thank you very much for considering my problem.

documentation]# node sample_server,js
.......
documentation]# node sample_client,js
using URSA
FAST:using node-expat

stoping
????

Hi Etienne,
The following code fails with the OPC-F standard server

   var monitoredItem = subscription.monitor(
    {
        nodeId: resolveNodeId(startnode),
        attributeId: 13
    },
    {
        samplingInterval: 1000,
        discardOldest: true,
        queueSize: 100
    });

The servers fails with a BadTimestampsToReturn. Looks like the timestampToReturn field is not initialized in the monitor request (subscription_client.js) that's why the server rejects the monitor request.

    var browseDescription = {
        nodeId: "RootFolder",
      //  referenceTypeId: "Organizes",
        browseDirection: BrowseDirection.Inverse
    }
   the_session.browse(browseDescription, function (err, results, diagnostics) {
   results[0].references.forEach(ref => { console.log(ref); });
   callback(err);
    });

says ReferenceError: BrowseDirection is not defined.

Hello,

I am trying to browserify the node-opcua module withouth success. Is it possible in the current stage of developement? I have tried setting transform option with requirish module but still it can't resolve the modules. File sample_client.js contains one line wich basically just requires the node-opcua module.

It works if I run it as 'node sample_client.js'. Browserify command works with other modules (like async). The error I am receiving:

$ browserify -t requirish ./opcua/sample_client.js > bundle.js 
Error: Cannot find module 'lib/datamodel/structures' from '/home/jkochman/Work/MTViewCenter2/node_modules/node-opcua'
    at /usr/local/lib/node_modules/browserify/node_modules/browser-resolve/node_modules/resolve/lib/async.js:51:17
    at process (/usr/local/lib/node_modules/browserify/node_modules/browser-resolve/node_modules/resolve/lib/async.js:159:43)
    at /usr/local/lib/node_modules/browserify/node_modules/browser-resolve/node_modules/resolve/lib/async.js:168:21
    at load (/usr/local/lib/node_modules/browserify/node_modules/browser-resolve/node_modules/resolve/lib/async.js:99:43)
    at /usr/local/lib/node_modules/browserify/node_modules/browser-resolve/node_modules/resolve/lib/async.js:105:22
    at /usr/local/lib/node_modules/browserify/node_modules/browser-resolve/node_modules/resolve/lib/async.js:22:47
    at Object.oncomplete (fs.js:107:15)

Kind regards,
Jakub

Hi!

I' m testing your client example with Kepware product but i got error when i try to read a variable. my code is:
the_session.readVariableValue("ns=3;s=MOYNOSFNE12.SFNE12.pippo", function(err,dataValues,diagnostics) {

Where MOYNOSFNE12 is Channel and SFNE12 is device.... Have you tested with Kepware? Can you help me?

Hi, in the released version, the add method to the objects is lacking. However, in the codes that are in development, I notice addMethod() function has been implemented in the server-engine. I tried implementing it but to no avail.

Currently, I have this error:
Cannot find module 'generated/_auto_generated_CallMethodRequest'

How do I generate this file and the others that are not included in the released version?

How can i connect to an opc server by using an username, password and encryption? I'm not able to write any value. I just got error messages. Using a testing tool i have to type a username and password to connect and it works fine. Is there anything i have to take care by writing values an setting up the connection?

readVariableValue doesn't return serverTimestamp & sourceTimestamp.

OPCUASession.prototype.readVariableValue = function (nodes, callback) {
...

var request = new read_service.ReadRequest({
    nodesToRead: nodesToRead,
    timestampsToReturn: read_service.TimestampsToReturn.Neither
});

I used your simple_client (https://github.com/node-opcua/node-opcua/blob/master/documentation/creating_a_client.md with a minor modification: dataValue.value.value --> dataValue in line 92) to read items in a OPC Server. Then I got

% free mem = { value:
{ dataType: [Getter/Setter],
arrayType: [Getter/Setter],
value: 67 },
statusCode: undefined,
sourceTimestamp: null,
sourcePicoseconds: 0,
serverTimestamp: null,
serverPicoseconds: 0 }

Why it could not read SourceTimestamp and serverTimestamp? I tried it with other OPC UA client (e.g Kepware Quick Client) and their items have these properties.

Decoding dates seem to be offset incorrectly, possibly encoding too?

I had a look at test_date_to_64bits_conversion.js and the test "should decode 92c253d3 0cf7ce01 DateTime as Dec 12, 2013 08:36:09.747317000" lacks asserts. If I correct the assert it fails because the decoding doesn't match the expected output.

Works:

"dependencies": {
    "async": "^0.9.0",
    "node-expat": "^2.3.3",
    "node-opcua": "0.0.35",
    "ursa": "^0.8.0"

doesnt:

"dependencies": {
    "async": "^0.9.0",
    "node-expat": "^2.3.3",
    "node-opcua": "0.0.36",
    "ursa": "^0.8.0"

stacktrace:

using URSA
FAST: using node-expat

buffer.js:582
    throw new RangeError('Trying to access beyond buffer length');
          ^
RangeError: Trying to access beyond buffer length
    at checkOffset (buffer.js:582:11)
    at Buffer.readUInt32LE (buffer.js:609:5)
    at BinaryStream.readUInt32 (/home/vincent/Documents/MesDashboard/Mes/test/node_modules/node-opcua/lib/misc/binaryStream.js:201:31)
    at exports.decodeUInt32 (/home/vincent/Documents/MesDashboard/Mes/test/node_modules/node-opcua/lib/misc/encode_decode.js:136:19)
    at SequenceHeader.decode (/home/vincent/Documents/MesDashboard/Mes/test/node_modules/node-opcua/_generated_/_auto_generated_SequenceHeader.js:77:27)
    at MessageBuilder._read_headers (/home/vincent/Documents/MesDashboard/Mes/test/node_modules/node-opcua/lib/misc/message_builder.js:329:29)
    at MessageBuilderBase._append (/home/vincent/Documents/MesDashboard/Mes/test/node_modules/node-opcua/lib/misc/message_builder_base.js:107:15)
    at MessageBuilderBase._feed_messageChunk (/home/vincent/Documents/MesDashboard/Mes/test/node_modules/node-opcua/lib/misc/message_builder_base.js:167:14)
    at null.<anonymous> (/home/vincent/Documents/MesDashboard/Mes/test/node_modules/node-opcua/lib/misc/message_builder_base.js:44:14)
    at emit (events.js:95:17)
    at PacketAssembler.feed (/home/vincent/Documents/MesDashboard/Mes/test/node_modules/node-opcua/lib/transport/packet_assembler.js:73:14)
    at MessageBuilderBase.feed (/home/vincent/Documents/MesDashboard/Mes/test/node_modules/node-opcua/lib/misc/message_builder_base.js:147:30)
    at ClientSecureChannelLayer._on_receive_message_chunk (/home/vincent/Documents/MesDashboard/Mes/test/node_modules/node-opcua/lib/client/client_secure_channel_layer.js:505:25)
    at null.<anonymous> (/home/vincent/Documents/MesDashboard/Mes/test/node_modules/node-opcua/lib/client/client_secure_channel_layer.js:258:18)
    at emit (events.js:95:17)
    at null.<anonymous> (/home/vincent/Documents/MesDashboard/Mes/test/node_modules/node-opcua/lib/transport/tcp_transport.js:288:14)
    at emit (events.js:95:17)
    at PacketAssembler.feed (/home/vincent/Documents/MesDashboard/Mes/test/node_modules/node-opcua/lib/transport/packet_assembler.js:73:14)
    at on_data_received_for_packet_assembler [as _on_data_received] (/home/vincent/Documents/MesDashboard/Mes/test/node_modules/node-opcua/lib/transport/tcp_transport.js:294:30)
    at Socket.<anonymous> (/home/vincent/Documents/MesDashboard/Mes/test/node_modules/node-opcua/lib/transport/tcp_transport.js:163:18)
    at Socket.emit (events.js:95:17)
    at Socket.<anonymous> (_stream_readable.js:764:14)
    at Socket.emit (events.js:92:17)
    at emitReadable_ (_stream_readable.js:426:10)
    at emitReadable (_stream_readable.js:422:5)
    at readableAddChunk (_stream_readable.js:165:9)
    at Socket.Readable.push (_stream_readable.js:127:10)
    at TCP.onread (net.js:528:21)

The code:

var opcua = require("node-opcua");
var async = require("async");

var client = new opcua.OPCUAClient();
var endpointUrl = "opc.tcp://10.24.24.112:49321/"
var the_session, the_subscription;

var tags = [  "ns=2;s=Simulation Examples.Functions.Sine1", 
              'ns=2;s=Channel1.Device1.Tag1',
              "ns=2;s=Simulation Examples.Functions.Ramp1",
              "ns=2;s=Simulation Examples.Functions.Ramp2"];


async.series([
    // step 1 : connect to
    function(callback)  {
        client.connect(endpointUrl,function (err) {
            if(err) {
                console.log(" cannot connect to endpoint :" , endpointUrl );
            } else {
                console.log("connected !");
            }
            callback(err);
        });
    },
    // step 2 : createSession
    function(callback) {
        client.createSession( function(err,session) {
            if(!err) {
                the_session = session;
            }
            callback(err);
        });
    },

    // step 3 : browse
    function(callback) {
       the_session.browse("RootFolder", function(err,browse_result){
           if(!err) {
               browse_result[0].references.forEach(function(reference) {
                   console.log("browseName: ", reference.browseName);
               });
           }
           callback(err);
       });
    },

    // step 4' : read a variable with read
    function(callback) {
      tags.forEach(function(tag){
         var max_age = 0;
         var nodes_to_read = [
            { nodeId: tag, attributeId: 13} 
         ];
         the_session.read(nodes_to_read, max_age, function(err,nodes_to_read,dataValues) {
             if (!err) {
                 console.log("Tag: " + tag + " :" , dataValues[0]);
             }else
              callback(err);
         });
     });
      //no error has occurred
      callback(null);
    },

    // step 5: install a subscription and install a monitored item for 10 seconds
    function(callback) {
       the_subscription=new opcua.ClientSubscription(the_session,{
           requestedPublishingInterval: 1000,
           requestedLifetimeCount: 10,
           requestedMaxKeepAliveCount: 2,
           maxNotificationsPerPublish: 10,
           publishingEnabled: true,
           priority: 10
       });

       the_subscription.on("started",function(){
           console.log("subscription started for 2 seconds - subscriptionId=",the_subscription.subscriptionId);
       }).on("keepalive",function(){
           console.log("keepalive");
       }).on("terminated",function(){
           callback();
       });

       // install monitored item
       tags.forEach(function(tag){
        (function(subscriptor, tag){
        var monitoredItem  = subscriptor.monitor({
          nodeId: opcua.resolveNodeId(tag),attributeId: 13
          },
          {
            samplingInterval: 100,
            discardOldest: true,
            queueSize: 10
          },
            opcua.read_service.TimestampsToReturn.Both
          );
          console.log("-------------------------------------");

          monitoredItem.on("changed",function(dataValue){
          console.log("Tag: " + tag + ' :' ,dataValue.value.value);
          });

       })(the_subscription, tag);
      });

    },

    // close session
    function(callback) {
        the_session.close(function(err){
            if(err) {
                console.log("session closed failed ?");
            }
            callback();
        });
    }

],
function(err) {
    if (err) {
        console.log(" failure ",err);
    } else {
        console.log("done!");
    }
    client.disconnect(function(){});
}) ;

I connecting with a kepserver 5.15

In UA-Expert, GUID identiers are shown in lower case. node-opcua-client is accepting only uppercase browse strings. See my code example below.

var browseDescription = { // TODO use uppercase-function
nodeId : new opcua.NodeId(datamodelNodeId.NodeIdType.GUID,"360273AA-F2B9-4A7F-A5E3-37B7074E2529",3)
}
the_session.browse(browseDescription, function(err, browse_result, diagnostics){

There is a timeout mechanism in place to let the server drops a connection if the time between a the client connection and the first HEL message.
The default value is currently 1000ms. This timeout parameter shall be made configurable to cope with slow client devices.

Hi erossignon,

How could I recursive browse all items of a OPC UA server?

I tried browse function with many type of browseDescription. However, it returns only one level up/down from the browsed node.

I also try crawler (as you used in /bin/simple_client.js) but I got following error message with KepWareEX Server or your sample server (https://github.com/node-opcua/node-opcua/blob/master/documentation/sample_server.js). It is ok with your server in /bin/simple_server.js!

Error message:
`[31mMessageBuilder : ERROR DETECTED IN event handler
[TypeError: Cannot call method 'substring' of undefined]
TypeError: Cannot call method 'substring' of undefined
at lowerize (D:\WorkSpace\Node.js\testopcua\node_modules\node-opcua\lib\client\node_crawler.js:351:20)
at D:\WorkSpace\Node.js\testopcua\node_modules\node-opcua\lib\client\node_crawler.js:393:27
at Array.map (native)
at _reconstruct_manageable_object (D:\WorkSpace\Node.js\testopcua\node_modules\node-opcua\lib\client\node_crawler.js:387:27)
at done (D:\WorkSpace\Node.js\testopcua\node_modules\node-opcua\lib\client\node_crawler.js:423:17)
at Object.self.q.drain (D:\WorkSpace\Node.js\testopcua\node_modules\node-opcua\lib\client\node_crawler.js:296:13)
at next (D:\WorkSpace\Node.js\testopcua\node_modules\node-opcua\node_modules\async\lib\async.js:804:31)
[...]

see #35

Hi,

I tried modifying the sample server to talk to a real PLC as a test. It worked well, but I wasn't sure how to return a bad status code to the client. Possibly:

return new opcua.Variant({dataType: opcua.DataType.Double, value: pump_speed, statusCode: opcua.StatusCodes.BadCommunicationError });

But that obviously isn't the right way. What is the best way to do this? Or will the status code always be "Good"?

Thanks...
Dana

We tried using the OPC NET API to connect to a running node-opcua server and were unable to. Is this action supported?

The monitored item samplingInterval may be set to 0 by a client.
(for instance UaExpert may specify a value of 0 for a publish interval)
In this case the server will emit a timer with a 0ms interval causing high CPU demand.
The samplingInterval interval shall be clamped to prevent server to be overwhelmed.

I'm running a simple OPC UA server on my BeagleBoneBlack and get the data via a OPC UA client (on another computer) from the server. Both, client und server are written with the node-opcua tool. I read every second some variables with the client and the CPU load of the BBB (the server) is about 100%!
Obviously needs the software much more hardware performance to run the node-opcua module on a Raspberry Pi or BBB.
Any experience with BBB and this module or any idea to reduce the cpu load?

Hey, just stumpled on your repo and I'm really interested in it, I've been working with OPC in languages like C# and Java and it also occured to me that Node.js would be perfect for handling asynchronous OPC polling.

I tried getting started with your code, but was unsure how to get started. Any chance you could make an example where it discovers OPC applications installed on the machine and allows connecting to them?

And is there a way I can help out with anything? :)

At this time sign&encrypt is not supported yet.
However, a server should reject any attempt by a client to establish a secure connection without crashing.

Hi,
The path in index.js file for VariantArrayType shows:
module.exports.VariantArrayType = require("lib/datamodel/datavalue").VariantArrayType;

But, I could not find any VariantArrayType declaration in datavalue.

Should it be lib/datamodel/variant instead?

I tried testing the nodejs server using Prosys java sdk 2.0.2 evaluation version. I used the SampleConsoleClient to connect to the server. After awhile, I received a recurring error on the client:

Client console output:
02/05/2015 15:15:01.560 ERROR 66 Failed to renew security token.
org.opcfoundation.ua.common.ServiceResultException: Bad_UnexpectedError (code=0x80010000, description="Sequence number mismatch")
at org.opcfoundation.ua.transport.tcp.io.TcpConnection$ReadThread.run(Unknown Source)
ServerState changed from Running to CommunicationFault

Test server console output:

Which side would be causing the problem?

with node flag --use_strict

subscription started for 2 seconds - subscriptionId= 17
�[31mMessageBuilder : ERROR DETECTED IN event handler�[39m
[TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them]
[ {},
{},
...

without --use_strict

subscription started for 2 seconds - subscriptionId= 18
�[31mMessageBuilder : ERROR DETECTED IN event handler�[39m
{ [AssertionError: response instanceof subscription_service.CreateMonitoredItemsResponse]
name: 'AssertionError',
actual: undefined,
expected: undefined,
operator: undefined,
message: 'response instanceof subscription_service.CreateMonitoredItemsResponse',
generatedMessage: false }
AssertionError: response instanceof subscription_service.CreateMonitoredItemsResponse

While running the subscription, it sometimes throw out the following error, and it will cause the subscription suspended, would you please suggest what happend ?
I'm using the opc foundation's Com Opc Server Wrapper with Kepeware 4 to monitor a simulator tag configured in kepware 4. If I tried to reboot the nodejs process for several times, then the error will disappear, but I don't know how to make it more stable.
Thanks a lot !

cannot find constructor for expandedId
{ identifierType: { key: 'NUMERIC', value: 1 },
  value: 820,
  namespace: 0 }

looks like the browseRequest always fails from the interactive_client..

b ObjectsFolder
StatusCode = Bad_NodeNotInView

the reason is that there is a piece of code in the C# which enforces to be sure we are in the default view.

if (NodeId.IsNull(view.m_viewId) && view.m_viewVersion == 0 && view.m_timestamp == DateTime.MinValue)
{
return true;
}

so you must not fill the m_timestamp attribute of the view parameter with the current date if you want a successful browse request

Hi,
I didn't found any example somewhere on how to use node-opcua to write data to an opc server.
I tried to use both writeSingleNode and write.
I did somethin like:

  function(callback) {
         var nodesToWrite = [
             { nodeId: "ns=4;s=S7-1500 station_1.PLC System.CAN_message_DB.CAN_CMD",
               attributeId: 1,
               indexRange: 0,
               value: 0
               }
         ];
       var value = 0;
       the_session.write(nodesToWrite, function(err,statusCode,diagnosticInfo) {
           if (!err) {
               console.log(" write ok" );
               console.log(diagnosticInfo);
               console.log(statusCode);
           }
           callback(err);
       });
    },

But I always get BadNotWritable or BadTypeMismatch, while trying different options.
There is a very useful sample code for reading data, is there something similar for writing data around there?
Thanks in advance for your help

Hi, I am trying to run some existing tests. How do I get this done?
I forked this project, imported it to Eclipse Enide and started Windows Power Shell, cd to node-opcua folder and ran 'nodeunit ./test/test_nodeopcua.js'.

I got this error message:

Cannot find module '_generated_/_auto_generated_DiagnosticInfo'

In fact my auto_generated folder of my project is empty.

UPDATE: ok the first step is to identify the correct testing framework. I found out that you are able to run all tests by calling 'npm test' after running 'npm install' - people on stackoverflow told me that probably 'mocha' is the name of the testing framework.

Hi Etienne,

Not sure where to ask this but, I'm just wondering if node-opcua supports reading/writing values from/to OPC DA Servers?

Thank you.

Hi Etienne,

I wanted to test your command line interface mentioned in line 10 of simple_client.js. I was not able to set an accepted NodeId name, i.e. if I call

    node bin/simple_client.js --endpoint opc.tcp://ehome09:48010 --node "ns=3,s={360273AA-F2B9-4A7F-A5E3-37B7074E2529}.MechanicalDomain"

I will get an error:

throw new Error("String cannot be coerced to a nodeId : " + value)
                  ^
Error: String cannot be coerced to a nodeId : ns=3,s={360273AA-F2B9-4A7F-A5E3-37B7074E2529}.MechanicalDomain
    at TypeSchema.coerceNodeId ...

Can you verify that your example in your code is still working or are you able to add one more example call?

This is the corresponding file in node-opcua-project:
https://github.com/node-opcua/node-opcua/blob/master/bin/simple_client.js