OPC UA tag data doesn't flow unless I subscribe to it with an additional client

mellerbeck · February 11, 2020, 4:39pm

This is strange to me. I have a test opc ua server setup using this http://node-opcua.github.io/

node-opcua/node-opcua/blob/v2.1.3/documentation/sample_server.js

/*global require,setInterval,console */
const opcua = require("node-opcua");

// Let's create an instance of OPCUAServer
const server = new opcua.OPCUAServer({
    port: 4334, // the port of the listening socket of the server
    resourcePath: "/UA/MyLittleServer", // this path will be added to the endpoint resource name
     buildInfo : {
        productName: "MySampleServer1",
        buildNumber: "7658",
        buildDate: new Date(2014,5,2)
    }
});

function post_initialize() {
    console.log("initialized");
    function construct_my_address_space(server) {
    
        const addressSpace = server.engine.addressSpace;
        const namespace = addressSpace.getOwnNamespace();

This file has been truncated. show original

I setup a Machine Data Source

I setup a Test Machine

But no tag data is flowing.

The instant I subscribe to it using the CommServer OPC UA Viewer the data starts flowing.

Brian_Haselton · February 11, 2020, 6:05pm

Hi,

This is definitely interesting. I would suspect there’s something going on with the implementation here. To verify, we should check with an openly available client. There are a list of publicly available clients to test this with here: https://github.com/node-opcua/node-opcua/wiki/publicly-available-OPC-UA-Servers-and-Clients
Let me know if one of these works as expected, and we can go from there.

Thanks,
Brian

mellerbeck · February 19, 2020, 9:17pm

I ended up testing it with the Prosys OPC UA Simulation Server, and it worked as expected. I did notice that tulip is using the NodeOPCUA-Client which should just work beautifully with the node-opcua server… very strange.

Topic		Replies	Views
Connecting to an OPC UA server Support, Troubleshooting, & Help devices , machines	5	3271	February 10, 2020
OPC Data did not reflect to tulip Support, Troubleshooting, & Help	3	591	June 3, 2021
Data Tag Refresh (force request from machine) Product Suggestions	0	343	January 13, 2021
Handle Arrays in OPC UA streams to Tulip Product Suggestions machines , opc-ua	2	288	February 28, 2023
OPC UA Not Connecting Support, Troubleshooting, & Help connectors , office-hours , apps , analytics	4	890	November 29, 2021

OPC UA tag data doesn't flow unless I subscribe to it with an additional client

Related topics