Rust client sending 100% brightness and first 8 LEDs

client/.gitignore

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+/target
+/Cargo.lock

client/Cargo.toml

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+[package]
+name = "LEDboardClient"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

client/src/main.rs

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+use std::net::UdpSocket;
+use std::env;
+
+const IMAGE_WIDTH_BYTE : usize = (5*32) / 8; /* one byte contains 8 lets, one in each bit */
+const IMAGE_HEIGHT_BYTE : usize = 40;
+
+fn send_package(ipaddress: String) {
+    let mut image = [0; (IMAGE_WIDTH_BYTE*IMAGE_HEIGHT_BYTE)+1];
+    image[0] = 0xFF;
+    image[1] = 0xFF;
+    let socket = UdpSocket::bind("0.0.0.0:4242").expect("couldn't bind to address");
+    socket.send_to(&image, ipaddress + ":4242").expect("couldn't send data");
+    println!("Packet sent");
+}
+
+fn help() {
+    println!("usage:
+LEDboardClient <ip address>");
+println!("one argument necessary!");
+            println!("<ip address>");
+}
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+
+    match args.len() {
+        // no arguments passed
+        1 => {
+            // show a help message
+            help();
+        },
+        // one argument passed
+        2 => {
+            let ip = &args[1];
+            send_package(ip.to_string());
+        },
+        // all the other cases
+        _ => {
+            // show a help message
+            help();
+        }
+    }
+}