Obtain serial device path from cli arg, enable LTO for release builds

Cargo.toml

@@ -3,6 +3,9 @@ name = "kulifuli-host"
 version = "0.1.0"
 edition = "2024"
 
+[profile.release]
+lto = true
+
 [dependencies]
 eyre = "0.6.12"
 serialport = "4.7.2"

src/main.rs

@@ -1,11 +1,21 @@
 use eyre::{Result, bail, ensure, eyre};
 use serialport::TTYPort;
+use std::env::args;
 use std::io::{Read, Write, stdin, stdout};
+use std::process::exit;
 use std::str::FromStr;
 use std::time::Duration;
 
 fn main() -> Result<()> {
-    let mut port = serialport::new("/dev/ttyACM0", 9600)
+    let args = args().collect::<Vec<_>>();
+    let serial_device = args.get(1);
+    if serial_device.is_none() {
+        println!("Please give a serial device path as program argument");
+        exit(1);
+    }
+    let serial_device = serial_device.unwrap();
+
+    let mut port = serialport::new(serial_device, 9600)
         .timeout(Duration::from_secs(3600))
         .open_native()?;