diff --git a/apps/magpie/src/protocol.rs b/apps/magpie/src/protocol.rs
index 133d59f..87c89c6 100644
--- a/apps/magpie/src/protocol.rs
+++ b/apps/magpie/src/protocol.rs
@@ -214,10 +214,23 @@ impl<T: Read, I: DeserializeOwned, O> Messenger<T, I, O> {
 #[cfg(feature = "async")]
 mod async_messages {
     use super::*;
-    use futures_util::AsyncReadExt;
+    use futures_util::{AsyncReadExt, AsyncWriteExt};
     use std::marker::Unpin;
 
-    impl<T: AsyncReadExt + Unpin, I: DeserializeOwned, O: Serialize> Messenger<T, I, O> {
+    impl<T: AsyncWriteExt + Unpin, I, O: Serialize> Messenger<T, I, O> {
+        pub async fn send_async(&mut self, msg: &O) -> std::io::Result<()> {
+            use byteorder::{LittleEndian, WriteBytesExt};
+            let payload = serde_json::to_vec(msg).unwrap();
+            let len = payload.len() as u32;
+            let mut msg = Vec::with_capacity(4 + payload.len());
+            msg.write_u32::<LittleEndian>(len)?;
+            msg.extend_from_slice(&payload);
+            self.transport.write_all(&msg).await?;
+            Ok(())
+        }
+    }
+
+    impl<T: AsyncReadExt + Unpin, I: DeserializeOwned, O> Messenger<T, I, O> {
         pub async fn recv(&mut self) -> std::io::Result<I> {
             let mut buf = [0u8; 1024];