made the port an argument

src/main.rs

@@ -1,6 +1,7 @@
 use reqwest::Client;
 use serde::Deserialize;
 use serial::prelude::*;
+use std::env;
 use std::io;
 use std::str::from_utf8;
 use std::time::Duration;
@@ -43,7 +44,9 @@ struct ImageLinks {
 
 #[tokio::main]
 async fn main() {
-  let mut port = serial::open("/dev/ttyACM0").unwrap();
+  let args: Vec<String> = env::args().collect();
+  let path_to_scanner = &args[1];
+  let mut port = serial::open(path_to_scanner).unwrap();
   interact(&mut port).await.unwrap();
 }