open62541

This crate provides high-level, safe bindings for the C99 library open62541, an open source and free implementation of OPC UA.

lib.rs:

Rust wrapper for the open62541 library.

Examples

Connect to server

use open62541::AsyncClient;

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let client = AsyncClient::new("opc.tcp://opcuademo.sterfive.com:26543")?;
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Read node's value attribute

use open62541::ua::NodeId;

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

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

println!("Received value: {value:?}");
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Watch node for changes in value attribute

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// 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:?}");
}
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