diff --git a/prototypes/quic_demo/src/bin/quic_demo_end_server.rs b/prototypes/quic_demo/src/bin/quic_demo_end_server.rs
new file mode 100644
index 0000000..dcfc6df
--- /dev/null
+++ b/prototypes/quic_demo/src/bin/quic_demo_end_server.rs
@@ -0,0 +1,29 @@
+use quic_demo::prelude::*;
+
+#[tokio::main]
+async fn main () -> anyhow::Result <()> {
+	tracing_subscriber::fmt::init ();
+	
+	let server_cert = tokio::fs::read ("quic_server.crt").await?;
+	let server_addr = "127.0.0.1:30380".parse ()?;
+	let endpoint = make_client_endpoint ("0.0.0.0:0".parse ()?, &[&server_cert])?;
+	
+	debug! ("Connecting to relay server");
+	
+	let quinn::NewConnection {
+		mut bi_streams,
+		..
+	} = endpoint.connect (&server_addr, "localhost")?.await?;
+	
+	debug! ("Waiting for incoming bi stream");
+	
+	let (mut send, mut recv) = bi_streams.next ().await.ok_or_else (|| anyhow::anyhow! ("Relay server didn't open a bi stream"))??;
+	
+	let mut buf = vec! [0u8; 65_536];
+	while let Some (bytes_read) = recv.read (&mut buf).await? {
+		let s = format! ("bytes_read: {}\n", bytes_read);
+		send.write_all (s.as_bytes ()).await?;
+	}
+	
+	Ok (())
+}
diff --git a/prototypes/quic_demo/src/bin/quic_demo_server.rs b/prototypes/quic_demo/src/bin/quic_demo_relay_server.rs
similarity index 89%
rename from prototypes/quic_demo/src/bin/quic_demo_server.rs
rename to prototypes/quic_demo/src/bin/quic_demo_relay_server.rs
index f28f873..01d934e 100644
--- a/prototypes/quic_demo/src/bin/quic_demo_server.rs
+++ b/prototypes/quic_demo/src/bin/quic_demo_relay_server.rs
@@ -1,18 +1,10 @@
-use futures_util::StreamExt;
-use tracing::{
-	debug,
-	error,
-	info,
-	warn,
-};
-
-use quic_demo::quinn_utils::*;
+use quic_demo::prelude::*;
 
 #[tokio::main]
 async fn main () -> anyhow::Result <()> {
 	tracing_subscriber::fmt::init ();
 	
-	let server_addr = "0.0.0.0:5000".parse ()?;
+	let server_addr = "0.0.0.0:30380".parse ()?;
 	let (mut incoming, server_cert) = make_server_endpoint (server_addr)?;
 	tokio::fs::write ("quic_server.crt", &server_cert).await?;
 	
@@ -57,7 +49,7 @@ async fn main () -> anyhow::Result <()> {
 		let mut buf = vec! [0u8; 65_536];
 		while let Some (bytes_read) = client_recv.read (&mut buf).await? {
 			let buf_slice = &buf [0..bytes_read];
-			server_send.write (buf_slice).await?;
+			server_send.write_all (buf_slice).await?;
 		}
 		
 		debug! ("Uplink closed");
@@ -71,7 +63,7 @@ async fn main () -> anyhow::Result <()> {
 		let mut buf = vec! [0u8; 65_536];
 		while let Some (bytes_read) = server_recv.read (&mut buf).await? {
 			let buf_slice = &buf [0..bytes_read];
-			client_send.write (buf_slice).await?;
+			client_send.write_all (buf_slice).await?;
 		}
 		
 		debug! ("Downlink closed");
diff --git a/prototypes/quic_demo/src/lib.rs b/prototypes/quic_demo/src/lib.rs
index fdfefeb..d102ef4 100644
--- a/prototypes/quic_demo/src/lib.rs
+++ b/prototypes/quic_demo/src/lib.rs
@@ -1 +1,2 @@
+pub mod prelude;
 pub mod quinn_utils;
diff --git a/prototypes/quic_demo/src/prelude.rs b/prototypes/quic_demo/src/prelude.rs
new file mode 100644
index 0000000..2ab0c75
--- /dev/null
+++ b/prototypes/quic_demo/src/prelude.rs
@@ -0,0 +1,9 @@
+pub use futures_util::StreamExt;
+pub use tracing::{
+	debug,
+	error,
+	info,
+	warn,
+};
+
+pub use crate::quinn_utils::*;
diff --git a/prototypes/quic_demo/src/quinn_utils.rs b/prototypes/quic_demo/src/quinn_utils.rs
index 727110f..2a34319 100644
--- a/prototypes/quic_demo/src/quinn_utils.rs
+++ b/prototypes/quic_demo/src/quinn_utils.rs
@@ -7,6 +7,23 @@ use quinn::{
 };
 use std::{error::Error, net::SocketAddr, sync::Arc};
 
+/// Constructs a QUIC endpoint configured for use a client only.
+///
+/// ## Args
+///
+/// - server_certs: list of trusted certificates.
+#[allow(unused)]
+pub fn make_client_endpoint(
+	bind_addr: SocketAddr,
+	server_certs: &[&[u8]],
+) -> anyhow::Result<Endpoint> {
+	let client_cfg = configure_client(server_certs)?;
+	let mut endpoint_builder = Endpoint::builder();
+	endpoint_builder.default_client_config(client_cfg);
+	let (endpoint, _incoming) = endpoint_builder.bind(&bind_addr)?;
+	Ok(endpoint)
+}
+
 /// Constructs a QUIC endpoint configured to listen for incoming connections
 /// on a certain address and port.
 ///
@@ -23,6 +40,19 @@ pub fn make_server_endpoint(bind_addr: SocketAddr) -> anyhow::Result<(Incoming,
 	Ok((incoming, server_cert))
 }
 
+/// Builds default quinn client config and trusts given certificates.
+///
+/// ## Args
+///
+/// - server_certs: a list of trusted certificates in DER format.
+fn configure_client(server_certs: &[&[u8]]) -> anyhow::Result<ClientConfig> {
+	let mut cfg_builder = ClientConfigBuilder::default();
+	for cert in server_certs {
+		cfg_builder.add_certificate_authority(Certificate::from_der(&cert)?)?;
+	}
+	Ok(cfg_builder.build())
+}
+
 /// Returns default server configuration along with its certificate.
 #[allow(clippy::field_reassign_with_default)] // https://github.com/rust-lang/rust-clippy/issues/6527
 fn configure_server() -> anyhow::Result<(ServerConfig, Vec<u8>)> {