node-opcua subscribe to event and get all fields - opc-ua

Question

i've found here an example code that works ok as a subscription to events (code below),
i'm trying to use it on a custom serve that send some other fields, but if i add those fileds name to the const fields, i get null value, so i would like to get all the fields available in the event to understand what the server send but if i remove the eventFilter option i just get empty events
any suggestion on how to get all the fields from an event?
import {
AttributeIds,
constructEventFilter,
ObjectIds,
OPCUAClient,
TimestampsToReturn,
Variant,
} from "node-opcua-client";
async function main(): Promise<void> {
const client = OPCUAClient.create({});
const endpointUrl = "opc.tcp://opcua.demo-this.com:62544/Quickstarts/AlarmConditionServer";
const subscriptionParamters = {
requestedPublishingInterval: 1000,
maxNotificationsPerPublish: 100,
publishingEnabled: true,
priority: 10,
};
await client.withSubscriptionAsync(endpointUrl, subscriptionParamters, async (session, subscription) => {
const fields = [
"EventId",
"EventType",
"SourceNode",
"SourceName",
"Time",
"ReceiveTime",
"Message",
"Severity",
];
const eventFilter = constructEventFilter(fields);
const event_monitoringItem = await subscription.monitor(
{
nodeId: ObjectIds.Server,
attributeId: AttributeIds.EventNotifier,
},
{
queueSize: 10,
filter: eventFilter,
discardOldest: true,
},
TimestampsToReturn.Both
);
event_monitoringItem.on("changed", (events: Variant[]) => {
for(let i=0;i<events.length;i++) {
console.log(fields[i],"=", events[i].toString());
}
console.log("----------------\n\n")
});
console.log("CTRL+C to stop");
await new Promise<void>((resolve) => process.once("SIGINT", resolve));
}
);
}
main();

Answer 1

I think you have to add the namespace index for your single event fields as well. And if they are sub properties the full path.
So it could look like this:
const fields = [
"EventId",
"EventType",
"3:MyProp1",
"3:MyProp2",
"3:SomeSubObject/SomeOtherProperty",
];