diff --git a/hptp-recv/src/main.rs b/hptp-recv/src/main.rs
index 7956ae5..7eba27b 100644
--- a/hptp-recv/src/main.rs
+++ b/hptp-recv/src/main.rs
@@ -6,7 +6,7 @@ extern crate thiserror;
 
 use hptp::log::Logger;
 use hptp::msg::Msg;
-use hptp::peer::DownloadPeer;
+use hptp::peer::Peer;
 use tokio::io::AsyncWrite;
 
 #[derive(Error, Debug)]
@@ -42,20 +42,23 @@ async fn start(log: &mut Logger) -> Result<(), Error> {
         .await
         .map_err(|_| Error::NoPortAvail)?;
     log.bound(sock.local_addr()?.port()).await;
-    let mut peer = DownloadPeer::new(tokio::io::stdout(), sock);
-    download(log, &mut peer).await
+    let mut out = tokio::io::stdout();
+    let mut peer = Peer::new(sock);
+    download(log, &mut peer, &mut out).await
 }
 
-async fn download<OUT>(log: &mut Logger, peer: &mut DownloadPeer<OUT>) -> Result<(), Error>
+async fn download<OUT>(log: &mut Logger, peer: &mut Peer, out: &mut OUT) -> Result<(), Error>
 where
     OUT: AsyncWrite + Unpin,
 {
+    use tokio::io::AsyncWriteExt;
     let mut pos = 0;
     loop {
         match peer.recv().await? {
             Msg::Data(data) => {
                 let len = data.len();
-                peer.write_output(&data).await;
+                out.write_all(&data).await?;
+                out.flush().await?;
                 log.recv_data_accepted(pos, len, hptp::log::InOrder).await;
                 pos += len;
             }
diff --git a/hptp-send/src/main.rs b/hptp-send/src/main.rs
index d429eec..eb41959 100644
--- a/hptp-send/src/main.rs
+++ b/hptp-send/src/main.rs
@@ -6,8 +6,8 @@ extern crate thiserror;
 
 use hptp::log::Logger;
 use hptp::msg::Msg;
-use hptp::peer::UploadPeer;
-use std::net::SocketAddrV4;
+use hptp::peer::Peer;
+use std::net::SocketAddr;
 use tokio::io::AsyncRead;
 // use tokio::net::UdpSocket;
 
@@ -56,24 +56,40 @@ async fn start(log: &mut Logger) -> Result<(), Error> {
         .map_err(|_| Error::NoAvailPort)?;
     log.debug_msg(format!("bound on {}", sock.local_addr()?))
         .await;
-    let mut peer = UploadPeer::new(tokio::io::stdin(), sock, targ_addr);
-    upload(log, &mut peer).await
+    let mut out = tokio::io::stdin();
+    let mut peer = Peer::new(sock);
+    peer.set_known_target(targ_addr);
+    upload(log, &mut peer, &mut out).await
 }
 
-fn parse_args(mut args: impl Iterator<Item = String>) -> Result<SocketAddrV4, Error> {
+fn parse_args(mut args: impl Iterator<Item = String>) -> Result<SocketAddr, Error> {
     args.nth(1)
         .ok_or(Error::InvalidArgs)?
         .parse()
         .map_err(|_| Error::InvalidArgs)
 }
 
-async fn upload<IN>(log: &mut Logger, peer: &mut UploadPeer<IN>) -> Result<(), Error>
+async fn read_some<IN>(inp: &mut IN) -> Result<Option<Vec<u8>>, Error>
+where
+    IN: AsyncRead + Unpin,
+{
+    use tokio::io::AsyncReadExt;
+    let mut buf = [0u8; 512];
+    let len = inp.read(&mut buf).await?;
+    Ok(if len > 0 {
+        Some(buf[..len].into())
+    } else {
+        None
+    })
+}
+
+async fn upload<IN>(log: &mut Logger, peer: &mut Peer, inp: &mut IN) -> Result<(), Error>
 where
     IN: AsyncRead + Unpin,
 {
     let mut pos = 0;
     loop {
-        match peer.read_input().await {
+        match read_some(inp).await? {
             Some(data) => {
                 let len = data.len();
                 peer.send(Msg::Data(data)).await?;
diff --git a/hptp/src/peer.rs b/hptp/src/peer.rs
index 7435087..cde4a83 100644
--- a/hptp/src/peer.rs
+++ b/hptp/src/peer.rs
@@ -1,83 +1,39 @@
-use std::net::SocketAddrV4;
-use tokio::io::{AsyncRead, AsyncWrite};
+use std::net::SocketAddr;
 use tokio::net::UdpSocket;
 
 use super::msg::Msg;
 
-pub struct UploadPeer<IN> {
-    input: IN,
-    sock: UdpSocket,
-    targ: SocketAddrV4,
-}
-
-pub struct DownloadPeer<OUT> {
-    output: OUT,
+pub struct Peer {
     sock: UdpSocket,
+    targ: Option<SocketAddr>,
 }
 
 const BUFFER_SIZE: usize = 1000;
 
-impl<IN> UploadPeer<IN> {
-    pub fn new(input: IN, sock: UdpSocket, targ: SocketAddrV4) -> Self {
-        UploadPeer { input, sock, targ }
+impl Peer {
+    pub fn new(sock: UdpSocket) -> Self {
+        Peer { sock, targ: None }
+    }
+
+    pub fn set_known_target(&mut self, addr: SocketAddr) {
+        self.targ = Some(addr);
     }
 
     pub async fn send(&mut self, msg: Msg) -> Result<(), tokio::io::Error> {
+        let targ = self.targ.expect("no target to send to");
         let bs = msg.ser();
         let mut i = 0;
         while i < bs.len() {
-            let n = self.sock.send_to(&bs[i..], self.targ).await?;
+            let n = self.sock.send_to(&bs[i..], targ).await?;
             i += n
         }
         Ok(())
     }
-}
-
-impl<IN> UploadPeer<IN>
-where
-    IN: AsyncRead + Unpin,
-{
-    pub async fn read_input(&mut self) -> Option<Vec<u8>> {
-        use tokio::io::AsyncReadExt;
-        let mut buf = [0u8; BUFFER_SIZE];
-        let len = self
-            .input
-            .read(&mut buf)
-            .await
-            .expect("failed to read from stdin");
-        if len == 0 {
-            None
-        } else {
-            Some(buf[..len].into())
-        }
-    }
-}
-
-impl<OUT> DownloadPeer<OUT> {
-    pub fn new(output: OUT, sock: UdpSocket) -> Self {
-        DownloadPeer { output, sock }
-    }
 
     pub async fn recv(&mut self) -> Result<Msg, tokio::io::Error> {
         let mut buf = [0u8; BUFFER_SIZE];
-        let (len, _who) = self.sock.recv_from(&mut buf).await?;
+        let (len, who) = self.sock.recv_from(&mut buf).await?;
+        self.set_known_target(who);
         Ok(Msg::des(&buf[..len]))
     }
 }
-
-impl<OUT> DownloadPeer<OUT>
-where
-    OUT: AsyncWrite + Unpin,
-{
-    pub async fn write_output(&mut self, data: &[u8]) {
-        use tokio::io::AsyncWriteExt;
-        self.output
-            .write_all(data)
-            .await
-            .expect("failed to write to stdout");
-        self.output
-            .flush()
-            .await
-            .expect("failed to write to stdout")
-    }
-}