OPC-UA example from README not working

[danielpeintner]

I tried to run the OPC-UA example demo-opcua1.ts from README (see gist for full code).

When trying to run it I get the following error

Cannot figure out field category for  { name: 'value', fieldType: 'Variant', defaultValue: null }
...\node_modules\node-opcua-factory\dist\builtin_types.js:262
        throw new Error("Cannot find schema for simple type " + name);

The issue seems to come from node-opcua and not from node-wot code.
@erossignon do you have any advice?

[danielpeintner]

Interesting: IF I run the sample demo-opcua1 from https://github.com/eclipse-thingweb/node-wot/blob/master/packages/examples/src/bindings/opcua/demo-opcua1.ts I get a different error...

D:\Projects\WoT\thingweb\thingweb.node-wot-danielpeintner\packages\examples>node dist\bindings\opcua\demo-opcua1
D:\Projects\WoT\thingweb\thingweb.node-wot-danielpeintner\packages\binding-opcua\dist\opcua-protocol-client.js:117
                    throw new Error("Cannot connected to endpoint " + endpoint + "\nmsg = " + err.message);
                          ^

Error: Cannot connected to endpoint opc.tcp://opcuademo.sterfive.com:26543
msg = The connection may have been rejected by server,
Err = (ERROR in waiting for data on socket ( timeout was = 60000 ms) undefined)
    at OPCUAProtocolClient.<anonymous> (D:\Projects\WoT\thingweb\thingweb.node-wot-danielpeintner\packages\binding-opcua\dist\opcua-protocol-client.js:117:27)
    at Generator.throw (<anonymous>)
    at rejected (D:\Projects\WoT\thingweb\thingweb.node-wot-danielpeintner\packages\binding-opcua\dist\opcua-protocol-client.js:6:65)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

Node.js v18.14.2

As if the server is not reachable even though the endpointUrl "opc.tcp://opcuademo.sterfive.com:26543" is the same?

[erossignon]

opcuademo.sterfive.com was down and should be back online.

[erossignon]

@danielpeintner

do you have any advice?

Can you share also the package.json for your gist ?

[danielpeintner]

opcuademo.sterfive.com was down and should be back online.

Mhh, not sure if it works...

Somehow the test still does not work, running node dist\bindings\opcua\demo-opcua1

D:\Projects\WoT\thingweb\thingweb.node-wot-danielpeintner\packages\examples>node dist\bindings\opcua\demo-opcua1
D:\Projects\WoT\thingweb\thingweb.node-wot-danielpeintner\packages\binding-opcua\dist\opcua-protocol-client.js:117
                    throw new Error("Cannot connected to endpoint " + endpoint + "\nmsg = " + err.message);
                          ^

Error: Cannot connected to endpoint opc.tcp://opcuademo.sterfive.com:26543
msg = The connection may have been rejected by server,
Err = (ERROR in waiting for data on socket ( timeout was = 60000 ms) undefined)
    at OPCUAProtocolClient.<anonymous> (D:\Projects\WoT\thingweb\thingweb.node-wot-danielpeintner\packages\binding-opcua\dist\opcua-protocol-client.js:117:27)
    at Generator.throw (<anonymous>)
    at rejected (D:\Projects\WoT\thingweb\thingweb.node-wot-danielpeintner\packages\binding-opcua\dist\opcua-protocol-client.js:6:65)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

Node.js v18.14.2

[danielpeintner]

do you have any advice?

Can you share also the package.json for your gist ?

What I would like to achieve is to run it with JS as we do with other bindings examples.
For doing so.. you can copy the JS gist in an empty folder and then

npm install @node-wot/core
npm install @node-wot/binding-opcua

--> package.json is automatically generated.

and run the example with
node demo-opcua1.js

and you will see the error

D:\Projects\2023\2023-OPC-UA\test3>node demo-opcua1.js
11:18:11.488Z :structured_type_schema        :32    Cannot figure out field category for  { name: 'value', fieldType: 'Variant', defaultValue: null }
D:\Projects\2023\2023-OPC-UA\test3\node_modules\node-opcua-data-value\node_modules\node-opcua-factory\dist\builtin_types.js:262
        throw new Error("Cannot find schema for simple type " + name);
        ^

Error: Cannot find schema for simple type Variant

[egekorkan]

I and @hasanheroglu have observed the same behavior when trying to integrate opc ua into WADE.

[danielpeintner]

@erossignon do you have any idea how we can work around it?

[erossignon]

OK,

• @node-wot/binding-opcua relies on node-opcua-pubsub-client and other node-opcua-xx libraries.
• in @node-wot/binding-opcua, are imported with fixed version.
• node-opcua-pubsub-client is relying on peerDependencies to include its relevant node-opcua-xx library ( no version fixed)
• for this reason any node-opcua-xxx libraries used by node-opcua-pubsub-client must be declared in the package.json of the main application.
• by default, if not specified, npm use the latest version it found, leading to version conflicts that are only highlighted at runtime.

        "node-opcua": "2.77.0",
        "node-opcua-address-space": "2.77.0",
        "node-opcua-basic-types": "2.77.0",
        "node-opcua-binary-stream": "2.77.0",
        "node-opcua-buffer-utils": "2.77.0",
        "node-opcua-data-model": "2.77.0",
        "node-opcua-data-value": "2.77.0",
        "node-opcua-extension-object": "2.77.0",
        "node-opcua-json": "0.19.1",
        "node-opcua-nodeid": "2.77.0",
        "node-opcua-pubsub-client": "0.19.1",
        "node-opcua-types": "2.77.0",
        "node-opcua-variant": "2.77.0"

from node-opcua-pubsub-client

    "node-opcua-basic-types": ">=2.64.0",
    "node-opcua-client": ">=2.64.0",
    "node-opcua-constants": ">=2.64.0",
    "node-opcua-data-model": ">=2.64.0",
    "node-opcua-debug": ">=2.64.0",
    "node-opcua-nodeid": ">=2.64.0",
    "node-opcua-pseudo-session": ">=2.64.0",
    "node-opcua-service-browse": ">=2.64.0",
    "node-opcua-service-translate-browse-path": ">=2.64.0",
    "node-opcua-status-code": ">=2.64.0",
    "node-opcua-types": ">=2.64.0",
    "node-opcua-variant": ">=2.64.0"

from node-opcua-pubsub-json

  "peerDependencies": {
    "node-opcua-basic-types": ">=2.64.0",
    "node-opcua-binary-stream": ">=2.64.0",
    "node-opcua-buffer-utils": ">=2.64.0",
    "node-opcua-data-model": ">=2.64.0",
    "node-opcua-data-value": ">=2.64.0",
    "node-opcua-date-time": ">=2.64.0",
    "node-opcua-debug": ">=2.64.0",
    "node-opcua-extension-object": ">=2.64.0",
    "node-opcua-factory": ">=2.64.0",
    "node-opcua-nodeid": ">=2.64.0",
    "node-opcua-numeric-range": ">=2.64.0",
    "node-opcua-status-code": ">=2.64.0",
    "node-opcua-types": ">=2.64.0",
    "node-opcua-variant": ">=2.64.0"
  },

those packages defined for node-opcua-pubsub-client are missing in binding-opcua or in the top-level package.json.

    "node-opcua-client": "2.77.0",
     "node-opcua-constants": "2.77.0",
     "node-opcua-debug": "2.77.0",
     "node-opcua-pseudo-session": "2.77.0",
     "node-opcua-service-browse": "2.77.0",
     "node-opcua-service-translate-browse-path": "2.77.0",
     "node-opcua-status-code": "2.77.0",
     "node-opcua-factory": "2.77.0",
     "node-opcua-date-time": "2.77.0",
     "node-opcua-numeric-range": "2.77.0"

I am going to provide a PR to fix the package.json in binding-opcua

[erossignon]

Also found out that rxjs@5.5.11 need to be explictely installed in top level package.json of the demo1.ts