diff --git a/README.md b/README.md
index 9044c42..fed8aa9 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,27 @@
 # LED-Board
 ## Project Page
 [C3MA](https://www.ccc-mannheim.de/wiki/LED-Board)
+
+## Controller 
+* PlatformIO
+
+### Hardware
+* Arduino MEGA2560
+* Ethernet shield
+
+### Firmware
+* PlatformIO based
+
+see **platformio.ini**
+
+## Client Software
+stored in folder **/client**
+
+### Dependency
+* rust
+* cargo
+
+### Build
+go to **/client**
+* cargo build
+* cargo run
diff --git a/client/.gitignore b/client/.gitignore
new file mode 100644
index 0000000..4fffb2f
--- /dev/null
+++ b/client/.gitignore
@@ -0,0 +1,2 @@
+/target
+/Cargo.lock
diff --git a/client/Cargo.toml b/client/Cargo.toml
new file mode 100644
index 0000000..9366195
--- /dev/null
+++ b/client/Cargo.toml
@@ -0,0 +1,8 @@
+[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]
diff --git a/client/src/main.rs b/client/src/main.rs
new file mode 100644
index 0000000..9b19b8f
--- /dev/null
+++ b/client/src/main.rs
@@ -0,0 +1,43 @@
+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();
+        }
+    }
+}