split ADDR and PORT

src/main.rs

@@ -8,7 +8,8 @@ use std::io;
 
 use tokio::net::TcpListener;
 
-const ADDR: &'static str = "0.0.0.0:7701";
+const ADDR: &'static str = "0.0.0.0";
+const PORT: u64 = 7701;
 const BUFSIZE: usize = 1024;
 
 #[tokio::main]
@@ -29,7 +30,7 @@ fn test() {
 }
 
 async fn apiserver() -> io::Result<()> {
-    let listener = match TcpListener::bind(ADDR).await {
+    let listener = match TcpListener::bind(format!("{}:{}", ADDR, PORT)).await {
         Ok(o) => o,
         Err(e) => {
             println!("error: {e}");