Merge #1281

1281: Wait for waker when no data is available on UDP socket. r=Dirbaio a=royb3



Co-authored-by: Roy Buitenhuis <roy.buitenhuis@technolution.nl>

embassy-net/src/udp.rs

@@ -94,8 +94,7 @@ impl<'a> UdpSocket<'a> {
                 Ok(x) => Poll::Ready(Ok(x)),
                 // No data ready
                 Err(udp::RecvError::Exhausted) => {
-                    //s.register_recv_waker(cx.waker());
-                    cx.waker().wake_by_ref();
+                    s.register_recv_waker(cx.waker());
                     Poll::Pending
                 }
             })