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simple_client_es8.js
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simple_client_es8.js
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const {
OPCUAClient,
AttributeIds,
TimestampsToReturn,
StatusCodes,
DataType,
} = require("node-opcua");
const endpointUrl = "opc.tcp://opcuademo.sterfive.com:26543";
const nodeId = "ns=7;s=Scalar_Simulation_Double";
async function main() {
try {
const client = OPCUAClient.create({
endpointMustExist: false,
connectionStrategy: {
maxRetry: 2,
initialDelay: 2000,
maxDelay: 10 * 1000,
},
});
client.on("backoff", () => console.log("retrying connection"));
await client.withSessionAsync(endpointUrl, async (session) => {
const browseResult = await session.browse("RootFolder");
console.log(
browseResult.references.map((r) => r.browseName.toString()).join("\n")
);
const dataValue = await session.read({
nodeId,
attributeId: AttributeIds.Value,
});
if (dataValue.statusCode.isBad()) {
console.log("err", dataValue.statusCode.toString());
} else {
console.log(` value = ${dataValue.value.toString()}`);
}
// step 5: install a subscription and monitored item
const subscription = await session.createSubscription2({
requestedPublishingInterval: 1000,
requestedLifetimeCount: 100, // 1000ms *100 every 2 minutes or so
requestedMaxKeepAliveCount: 10, // every 10 seconds
maxNotificationsPerPublish: 10,
publishingEnabled: true,
priority: 10,
});
subscription
.on("started", () =>
console.log(
"subscription started - subscriptionId=",
subscription.subscriptionId
)
)
.on("keepalive", () => console.log("keepalive"))
.on("terminated", () => console.log("subscription terminated"));
const monitoredItem = await subscription.monitor(
{
nodeId: nodeId,
attributeId: AttributeIds.Value,
},
{
samplingInterval: 1000,
discardOldest: true,
queueSize: 10,
},
TimestampsToReturn.Both
);
monitoredItem.on("changed", (dataValue) =>
console.log(` value = ${dataValue.value.value.toString()}`)
);
const statusCode = await session.write({
nodeId: "ns=7;s=Scalar_Static_Double",
attributeId: AttributeIds.Value,
value: {
statusCode: StatusCodes.Good,
sourceTimestamp: new Date(),
value: {
dataType: DataType.Double,
value: 25.0,
},
},
});
console.log("statusCode = ", statusCode.toString());
console.log("CTRL+C to stop");
await new Promise((resolve) => process.on("SIGINT", resolve));
await subscription.terminate();
});
} catch (err) {
console.log("Error !!!", err);
process.exit();
}
console.log("Bye!");
}
main();