2 files changed, 18 insertions, 9 deletions

diff --git a/embassy-net/Cargo.toml b/embassy-net/Cargo.toml
index e6c5ea74f..612a3d689 100644
--- a/embassy-net/Cargo.toml
+++ b/embassy-net/Cargo.toml
@@ -60,7 +60,7 @@ igmp = ["smoltcp/proto-igmp"]
 defmt = { version = "0.3", optional = true }
 log = { version = "0.4.14", optional = true }
 
-smoltcp = { git = "https://github.com/smoltcp-rs/smoltcp.git", rev = "b57e2f9e70e82a13f31d5ea17e55232c11cc2b2d", default-features = false, features = [
+smoltcp = { version = "0.11.0", default-features = false, features = [
   "socket",
   "async",
 ] }
diff --git a/embassy-net/src/udp.rs b/embassy-net/src/udp.rs
index 61058c1ba..d9df5b29d 100644
--- a/embassy-net/src/udp.rs
+++ b/embassy-net/src/udp.rs
@@ -26,13 +26,21 @@ pub enum BindError {
 /// Error returned by [`UdpSocket::recv_from`] and [`UdpSocket::send_to`].
 #[derive(PartialEq, Eq, Clone, Copy, Debug)]
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
-pub enum Error {
+pub enum SendError {
     /// No route to host.
     NoRoute,
     /// Socket not bound to an outgoing port.
     SocketNotBound,
 }
 
+/// Error returned by [`UdpSocket::recv_from`] and [`UdpSocket::send_to`].
+#[derive(PartialEq, Eq, Clone, Copy, Debug)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
+pub enum RecvError {
+    /// Provided buffer was smaller than the received packet.
+    Truncated,
+}
+
 /// An UDP socket.
 pub struct UdpSocket<'a> {
     stack: &'a RefCell<SocketStack>,
@@ -103,7 +111,7 @@ impl<'a> UdpSocket<'a> {
     /// This method will wait until a datagram is received.
     ///
     /// Returns the number of bytes received and the remote endpoint.
-    pub async fn recv_from(&self, buf: &mut [u8]) -> Result<(usize, IpEndpoint), Error> {
+    pub async fn recv_from(&self, buf: &mut [u8]) -> Result<(usize, IpEndpoint), RecvError> {
         poll_fn(move |cx| self.poll_recv_from(buf, cx)).await
     }
 
@@ -114,10 +122,11 @@ impl<'a> UdpSocket<'a> {
     ///
     /// When a datagram is received, this method will return `Poll::Ready` with the
     /// number of bytes received and the remote endpoint.
-    pub fn poll_recv_from(&self, buf: &mut [u8], cx: &mut Context<'_>) -> Poll<Result<(usize, IpEndpoint), Error>> {
+    pub fn poll_recv_from(&self, buf: &mut [u8], cx: &mut Context<'_>) -> Poll<Result<(usize, IpEndpoint), RecvError>> {
         self.with_mut(|s, _| match s.recv_slice(buf) {
             Ok((n, meta)) => Poll::Ready(Ok((n, meta.endpoint))),
             // No data ready
+            Err(udp::RecvError::Truncated) => Poll::Ready(Err(RecvError::Truncated)),
             Err(udp::RecvError::Exhausted) => {
                 s.register_recv_waker(cx.waker());
                 Poll::Pending
@@ -129,8 +138,8 @@ impl<'a> UdpSocket<'a> {
     ///
     /// This method will wait until the datagram has been sent.
     ///
-    /// When the remote endpoint is not reachable, this method will return `Err(Error::NoRoute)`
-    pub async fn send_to<T>(&self, buf: &[u8], remote_endpoint: T) -> Result<(), Error>
+    /// When the remote endpoint is not reachable, this method will return `Err(SendError::NoRoute)`
+    pub async fn send_to<T>(&self, buf: &[u8], remote_endpoint: T) -> Result<(), SendError>
     where
         T: Into<IpEndpoint>,
     {
@@ -146,7 +155,7 @@ impl<'a> UdpSocket<'a> {
     /// and register the current task to be notified when the buffer has space available.
     ///
     /// When the remote endpoint is not reachable, this method will return `Poll::Ready(Err(Error::NoRoute))`.
-    pub fn poll_send_to<T>(&self, buf: &[u8], remote_endpoint: T, cx: &mut Context<'_>) -> Poll<Result<(), Error>>
+    pub fn poll_send_to<T>(&self, buf: &[u8], remote_endpoint: T, cx: &mut Context<'_>) -> Poll<Result<(), SendError>>
     where
         T: Into<IpEndpoint>,
     {
@@ -160,9 +169,9 @@ impl<'a> UdpSocket<'a> {
             Err(udp::SendError::Unaddressable) => {
                 // If no sender/outgoing port is specified, there is not really "no route"
                 if s.endpoint().port == 0 {
-                    Poll::Ready(Err(Error::SocketNotBound))
+                    Poll::Ready(Err(SendError::SocketNotBound))
                 } else {
-                    Poll::Ready(Err(Error::NoRoute))
+                    Poll::Ready(Err(SendError::NoRoute))
                 }
             }
         })