Crate open62541

Rust wrapper for the open62541 library.

Examples

Connect to server

use open62541::AsyncClient;

let client = AsyncClient::new(
    "opc.tcp://opcuademo.sterfive.com:26543",
    tokio::time::Duration::from_millis(100),
)?;

Read node’s value attribute

use open62541::ua::NodeId;

let node_id = NodeId::numeric(0, 2258); // Server/ServerStatus/CurrentTime

let value = client.read_value(&node_id).await?;

println!("Received value: {value:?}");

Watch node for changes in value attribute

// Create subscription that receives the updates.
let subscription = client.create_subscription().await?;
// Create monitored item to receive node updates.
let mut monitored_item = subscription.create_monitored_item(&node_id).await?;

while let Some(value) = monitored_item.next().await {
    println!("Received value: {value:?}");
}

Modules

• ua
  Thin wrappers for open62541_sys types.

Structs

• AsyncClient
  Connected OPC UA client (with asynchronous API).
• AsyncMonitoredItem
  Monitored item (with asynchronous API).
• AsyncSubscription
  Subscription (with asynchronous API).
• CallbackOnce
  Type-removed one-shot callback.
• CallbackStream
  Type-removed stream sender.
• Client
  Connected OPC UA client.
• ClientBuilder
  Builder for Client.

Enums

• Error
  Generic error.

Traits

• DataType
  Transparent wrapper for OPC UA data type.