Outdoor chime filename as global constant

src/main.rs

@@ -12,6 +12,7 @@ use tokio::{ sync::mpsc,
              time::interval };
 use warp::{Filter, sse, sse::ServerSentEvent};
 
+const OUTDOOR_CHIME_FILE: &str = "static/outdoor.mp3";
 
 const BUTTON_PIN: u8 = 26;
 
@@ -70,7 +71,7 @@ async fn main() {
           }
           debug!("Playing doorbell chime");
           match process::Command::new("mplayer")
-                                 .arg("static/outdoor.mp3")
+                                 .arg(OUTDOOR_CHIME_FILE)
                                  .stdout(process::Stdio::null())
                                  .stderr(process::Stdio::null())
                                  .spawn() {