diff --git a/runtime/src/main.rs b/runtime/src/main.rs
index f56043b2..2c9168ce 100644
--- a/runtime/src/main.rs
+++ b/runtime/src/main.rs
@@ -4,23 +4,16 @@
 extern crate alloc;
 
 use core::{cmp, str};
-use core::mem::transmute;
 
 use libboard_zynq::{
     println,
     self as zynq, clocks::Clocks, clocks::source::{ClockSource, ArmPll, IoPll},
-    smoltcp::{
-        wire::{EthernetAddress, IpAddress, IpCidr},
-        iface::{NeighborCache, EthernetInterfaceBuilder, Routes},
-        time::Instant,
-    },
 };
-use libsupport_zynq::{
-    ram, alloc::{vec, vec::Vec},
-};
-use libasync::smoltcp::Sockets;
+use libsupport_zynq::ram;
+
 
 mod pl;
+mod network;
 
 fn identifier_read(buf: &mut [u8]) -> &str {
     unsafe {
@@ -35,8 +28,6 @@ fn identifier_read(buf: &mut [u8]) -> &str {
     }
 }
 
-const HWADDR: [u8; 6] = [0, 0x23, 0xab, 0xad, 0x1d, 0xea];
-
 #[no_mangle]
 pub fn main_core0() {
     println!("ARTIQ runtime starting...");
@@ -46,52 +37,13 @@ pub fn main_core0() {
     ArmPll::setup(2 * CPU_FREQ);
     Clocks::set_cpu_freq(CPU_FREQ);
     IoPll::setup(1_000_000_000);
-    libboard_zynq::stdio::drop_uart(); // why?
+    libboard_zynq::stdio::drop_uart(); // reinitialize UART after clocking change
     let mut ddr = zynq::ddr::DdrRam::new();
     ram::init_alloc(&mut ddr);
 
     println!("Detected gateware: {}", identifier_read(&mut [0; 64]));
 
-    let eth = zynq::eth::Eth::default(HWADDR.clone());
-    const RX_LEN: usize = 8;
-    let mut rx_descs = (0..RX_LEN)
-        .map(|_| zynq::eth::rx::DescEntry::zeroed())
-        .collect::<Vec<_>>();
-    let mut rx_buffers = vec![zynq::eth::Buffer::new(); RX_LEN];
-    // Number of transmission buffers (minimum is two because with
-    // one, duplicate packet transmission occurs)
-    const TX_LEN: usize = 8;
-    let mut tx_descs = (0..TX_LEN)
-        .map(|_| zynq::eth::tx::DescEntry::zeroed())
-        .collect::<Vec<_>>();
-    let mut tx_buffers = vec![zynq::eth::Buffer::new(); TX_LEN];
-    let eth = eth.start_rx(&mut rx_descs, &mut rx_buffers);
-    let mut eth = eth.start_tx(
-        // HACK
-        unsafe { transmute(tx_descs.as_mut_slice()) },
-        unsafe { transmute(tx_buffers.as_mut_slice()) },
-    );
-    let ethernet_addr = EthernetAddress(HWADDR);
-
-    let local_addr = IpAddress::v4(192, 168, 1, 52);
-    let mut ip_addrs = [IpCidr::new(local_addr, 24)];
-    let mut routes_storage = vec![None; 4];
-    let routes = Routes::new(&mut routes_storage[..]);
-    let mut neighbor_storage = vec![None; 256];
-    let neighbor_cache = NeighborCache::new(&mut neighbor_storage[..]);
-    let mut iface = EthernetInterfaceBuilder::new(&mut eth)
-        .ethernet_addr(ethernet_addr)
-        .ip_addrs(&mut ip_addrs[..])
-        .routes(routes)
-        .neighbor_cache(neighbor_cache)
-        .finalize();
-
-    Sockets::init(32);
-    let mut time = 0u32;
-    Sockets::run(&mut iface, || {
-        time += 1;
-        Instant::from_millis(time)
-    });
+    network::network_main();
 }
 
 #[no_mangle]
diff --git a/runtime/src/network.rs b/runtime/src/network.rs
new file mode 100644
index 00000000..2bde3d2d
--- /dev/null
+++ b/runtime/src/network.rs
@@ -0,0 +1,100 @@
+use core::{mem::transmute, task::Poll};
+
+use alloc::{borrow::ToOwned, format};
+use libboard_zynq::{
+    println,
+    self as zynq,
+    smoltcp::{
+        self,
+        wire::{EthernetAddress, IpAddress, Ipv4Address, IpCidr},
+        iface::{NeighborCache, EthernetInterfaceBuilder, Routes},
+        time::Instant,
+    },
+};
+use libsupport_zynq::alloc::{vec, vec::Vec};
+
+use libasync::smoltcp::{Sockets, TcpStream};
+
+
+async fn handle_connection(stream: TcpStream) -> smoltcp::Result<()> {
+    stream.send("Enter your name: ".bytes()).await?;
+    let name = stream.recv(|buf| {
+        for (i, b) in buf.iter().enumerate() {
+            if *b == '\n' as u8 {
+                return match core::str::from_utf8(&buf[0..i]) {
+                    Ok(name) =>
+                        Poll::Ready((i + 1, Some(name.to_owned()))),
+                    Err(_) =>
+                        Poll::Ready((i + 1, None))
+                };
+            }
+        }
+        if buf.len() > 100 {
+            // Too much input, consume all
+            Poll::Ready((buf.len(), None))
+        } else {
+            Poll::Pending
+        }
+    }).await?;
+    match name {
+        Some(name) =>
+            stream.send(format!("Hello {}!\n", name).bytes()).await?,
+        None =>
+            stream.send("I had trouble reading your name.\n".bytes()).await?,
+    }
+    stream.flush().await;
+    Ok(())
+}
+
+
+const HWADDR: [u8; 6] = [0, 0x23, 0xab, 0xad, 0x1d, 0xea];
+const IPADDR: IpAddress = IpAddress::Ipv4(Ipv4Address([192, 168, 1, 52]));
+
+pub fn network_main() {
+    let eth = zynq::eth::Eth::default(HWADDR.clone());
+    const RX_LEN: usize = 8;
+    let mut rx_descs = (0..RX_LEN)
+        .map(|_| zynq::eth::rx::DescEntry::zeroed())
+        .collect::<Vec<_>>();
+    let mut rx_buffers = vec![zynq::eth::Buffer::new(); RX_LEN];
+    // Number of transmission buffers (minimum is two because with
+    // one, duplicate packet transmission occurs)
+    const TX_LEN: usize = 8;
+    let mut tx_descs = (0..TX_LEN)
+        .map(|_| zynq::eth::tx::DescEntry::zeroed())
+        .collect::<Vec<_>>();
+    let mut tx_buffers = vec![zynq::eth::Buffer::new(); TX_LEN];
+    let eth = eth.start_rx(&mut rx_descs, &mut rx_buffers);
+    let mut eth = eth.start_tx(
+        // HACK
+        unsafe { transmute(tx_descs.as_mut_slice()) },
+        unsafe { transmute(tx_buffers.as_mut_slice()) },
+    );
+    let ethernet_addr = EthernetAddress(HWADDR);
+
+    let mut ip_addrs = [IpCidr::new(IPADDR, 24)];
+    let mut routes_storage = vec![None; 4];
+    let routes = Routes::new(&mut routes_storage[..]);
+    let mut neighbor_storage = vec![None; 256];
+    let neighbor_cache = NeighborCache::new(&mut neighbor_storage[..]);
+    let mut iface = EthernetInterfaceBuilder::new(&mut eth)
+        .ethernet_addr(ethernet_addr)
+        .ip_addrs(&mut ip_addrs[..])
+        .routes(routes)
+        .neighbor_cache(neighbor_cache)
+        .finalize();
+
+    Sockets::init(32);
+
+    TcpStream::listen(1381, 2048, 2048, 8, |stream| async {
+        let _ = handle_connection(stream)
+            .await
+            .map_err(|e| println!("Connection: {:?}", e));
+    });
+
+    let mut time = 0u32;
+    Sockets::run(&mut iface, || {
+        time += 1;
+        Instant::from_millis(time)
+    });
+}