Grabs port name from command line

src/main.rs

@@ -8,11 +8,7 @@ mod process;
 mod signal;
 
 use base64::encode;
-use std::{
-    io::{self, Read},
-    sync::{Arc, Mutex},
-    time::Duration,
-};
+use std::{env, io::{self, Read}, sync::{Arc, Mutex}, time::Duration};
 
 #[derive(strum_macros::Display)]
 pub enum PollType {
@@ -32,8 +28,10 @@ pub struct PollData {
 }
 
 fn main() {
-    // Open serial connection on /dev/ttyS2, max baud rate
-    let port = serialport::new("/dev/ttyS2", 115_200)
+    let port_name = env::args().nth(1).expect("Port name argument (1) is required");
+
+    // Open serial connection on /dev/hvc2, max baud rate
+    let port = serialport::new(port_name, 115_200)
         .timeout(Duration::from_millis(10))
         .open();