ctrl c listener for producer

examples/simple_producer/src/main.rs

@@ -123,9 +123,18 @@ async fn main() -> Result<(), Box<dyn Error>> {
     let sin_tlm_handle = tlm.register("simple_producer/sin".into(), TelemetryDataType::Float32).await?;
     let cos_tlm_handle = tlm.register("simple_producer/cos".into(), TelemetryDataType::Float64).await?;
 
+    let cancellation_token = CancellationToken::new();
+    {
+        let cancellation_token = cancellation_token.clone();
+        tokio::spawn(async move {
+            let _ = tokio::signal::ctrl_c().await;
+            cancellation_token.cancel();
+        });
+    }
+
     let mut next_time = Instant::now();
     let mut index = 0;
-    for _ in 0..100 {
+    while !cancellation_token.is_cancelled() {
         next_time += Duration::from_millis(100);
         index += 10;
         tokio::time::sleep_until(next_time).await;