diff --git a/problem_04/.gitignore b/problem_04/.gitignore
new file mode 100644
index 0000000..bef0727
--- /dev/null
+++ b/problem_04/.gitignore
@@ -0,0 +1,2 @@
+/target/
+.idea
diff --git a/problem_04/Cargo.toml b/problem_04/Cargo.toml
new file mode 100644
index 0000000..74cf7d9
--- /dev/null
+++ b/problem_04/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "problem_04"
+version = "0.1.0"
+edition = "2021"
+
+[[bin]]
+name = "server"
+path = "bin/server.rs"
+
+[[bin]]
+name = "client"
+path = "bin/client.rs"
+
+[dependencies]
+tokio = { version = "1.14.0", features = ["full"] }
+tracing = "0.1.37"
+tracing-subscriber = "0.3.17"
diff --git a/problem_04/bin/client.rs b/problem_04/bin/client.rs
new file mode 100644
index 0000000..e69de29
diff --git a/problem_04/bin/server.rs b/problem_04/bin/server.rs
new file mode 100644
index 0000000..c6e9f69
--- /dev/null
+++ b/problem_04/bin/server.rs
@@ -0,0 +1,15 @@
+use std::io;
+use tokio::net::UdpSocket;
+
+#[tokio::main]
+async fn main() -> io::Result<()> {
+    let sock = UdpSocket::bind("0.0.0.0:8080").await?;
+    let mut buf = [0; 1024];
+    loop {
+        let (len, addr) = sock.recv_from(&mut buf).await?;
+        println!("{:?} bytes received from {:?}", len, addr);
+
+        let len = sock.send_to(&buf[..len], addr).await?;
+        println!("{:?} bytes sent", len);
+    }
+}
diff --git a/problem_04/src/lib.rs b/problem_04/src/lib.rs
new file mode 100644
index 0000000..e7a11a9
--- /dev/null
+++ b/problem_04/src/lib.rs
@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}