Ensure TcpIo not blocking when reading into empty slice

embassy-net/src/tcp.rs

@@ -390,6 +390,13 @@ impl<'d> TcpIo<'d> {
             // CAUTION: smoltcp semantics around EOF are different to what you'd expect
             // from posix-like IO, so we have to tweak things here.
             self.with_mut(|s, _| match s.recv_slice(buf) {
+                // Reading into empty buffer
+                Ok(0) if buf.is_empty() => {
+                    // embedded_io_async::Read's contract is to not block if buf is empty. While
+                    // this function is not a direct implementor of the trait method, we still don't
+                    // want our future to never resolve.
+                    Poll::Ready(Ok(0))
+                }
                 // No data ready
                 Ok(0) => {
                     s.register_recv_waker(cx.waker());