Working Diag & artnet proto with imported led driver smi lib C

rust_sandbox/Cargo.toml

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+[package]
+name = "rust_sandbox"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+tokio = { version = "1.45.1", features = ["full"] }

rust_sandbox/src/main.rs

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+use tokio::{
+    spawn,
+    time::{Duration, sleep},
+};
+
+async fn say_hello() {
+    // Wait for a while before printing to make it a more interesting race.
+    sleep(Duration::from_millis(100)).await;
+    print!("hello ");
+}
+
+async fn say_world() {
+    sleep(Duration::from_millis(100)).await;
+    print!("world ");
+}
+
+#[tokio::main]
+async fn main() {
+    loop {
+        let handle1 = spawn(say_hello());
+        let handle2 = spawn(say_world());
+
+        let _ = handle1.await;
+        let _ = handle2.await;
+
+        println!("!");
+    }
+}