chore: Update async example after embedded io fix/rework. (#89)

Author: jettify

examples/local_async.rs

@@ -1,5 +1,6 @@
 use embedded_io_adapters::tokio_1::FromTokio;
 use std::env;
+use std::io::ErrorKind;
 use std::process::exit;
 use std::time::Duration;
 
@@ -8,21 +9,36 @@ use uf_crsf::async_io::AsyncCrsfReader;
 
 #[tokio::main]
 async fn main() {
-    let path = env::args().nth(1).unwrap_or_else(|| {
-        println!("No serial port specified. Usage: local_async <PATH>");
+    let ports = match serialport::available_ports() {
+        Ok(ports) => ports,
+        Err(e) => {
+            eprintln!("Failed to enumerate serial ports: {}", e);
+            exit(1);
+        }
+    };
 
-        let ports = match serialport::available_ports() {
-            Ok(ports) => ports,
-            Err(e) => {
-                eprintln!("Failed to enumerate serial ports: {}", e);
-                exit(1);
+    if ports.is_empty() {
+        eprintln!("No serial ports found.");
+        eprintln!("Please specify a serial port path as an argument.");
+        exit(1);
+    }
+
+    let path = env::args().nth(1).unwrap_or_else(|| {
+        const DEFAULT_PORT: &str = "/dev/tty.usbmodem00000000001B1";
+        if ports.iter().any(|p| p.port_name == DEFAULT_PORT) {
+            println!(
+                "No serial port specified. Using default port: {}",
+                DEFAULT_PORT
+            );
+            DEFAULT_PORT.to_string()
+        } else {
+            println!("No serial port specified. Available ports:");
+            for p in &ports {
+                println!("  {}", p.port_name);
             }
-        };
-        println!("Available ports:");
-        for p in &ports {
-            println!("  {}", p.port_name);
+            println!("\nUsing first available port: {}", ports[0].port_name);
+            ports[0].port_name.clone()
         }
-        exit(1);
     });
 
     let mut port = tokio_serial::new(&path, 420_000)
@@ -44,7 +60,6 @@ async fn main() {
             }
             Err(e) => {
                 eprintln!("Error reading from serial port: {:?}", e);
-                break;
             }
         }
     }

justfile

@@ -54,6 +54,11 @@ example_raw:
 example_simple:
   cargo run --example=simple
 
+# Run example local_simple that parses hard coded buffer.
+[group('examples')]
+example_async:
+  cargo run --example=async --all-features
+
 # Lint source code with strict linter
 [group('lint')]
 pedantic: