Add poll functions on UdpSocket.

embassy-net/src/udp.rs

@@ -102,7 +102,10 @@ impl<'a> UdpSocket<'a> {
     ///
     /// Returns the number of bytes received and the remote endpoint.
     pub async fn recv_from(&self, buf: &mut [u8]) -> Result<(usize, IpEndpoint), Error> {
-        poll_fn(move |cx| {
+        poll_fn(move |cx| self.poll_recv_from(buf, cx)).await
+    }
+
+    pub fn poll_recv_from(&self, buf: &mut[u8], cx: Context) -> Poll<Result<(usize, IpEndpoint), Error>> {
         self.with_mut(|s, _| match s.recv_slice(buf) {
             Ok((n, meta)) => Poll::Ready(Ok((n, meta.endpoint))),
             // No data ready
@@ -111,17 +114,21 @@ impl<'a> UdpSocket<'a> {
                 Poll::Pending
             }
         })
-        })
-        .await
     }
 
     /// Send a datagram to the specified remote endpoint.
     pub async fn send_to<T>(&self, buf: &[u8], remote_endpoint: T) -> Result<(), Error>
+    where
+        T: Into<IpEndpoint>,
+    {
+        poll_fn(move |cx| self.poll_send_to(buf, remote_endpoint, cx)).await
+    }
+
+    pub fn poll_send_to<T>(&self, buf: &[u8], remote_endpoint: T, cx: Context) -> Poll<Result<(), Error>>
     where
         T: Into<IpEndpoint>,
     {
         let remote_endpoint = remote_endpoint.into();
-        poll_fn(move |cx| {
         self.with_mut(|s, _| match s.send_slice(buf, remote_endpoint) {
             // Entire datagram has been sent
             Ok(()) => Poll::Ready(Ok(())),
@@ -131,8 +138,6 @@ impl<'a> UdpSocket<'a> {
             }
             Err(udp::SendError::Unaddressable) => Poll::Ready(Err(Error::NoRoute)),
         })
-        })
-        .await
     }
 
     /// Returns the local endpoint of the socket.