chore: udpate to smoltcp 0.12

src/virtual_device.rs

@@ -109,11 +109,11 @@ pub struct RxToken {
 }
 
 impl smoltcp::phy::RxToken for RxToken {
-    fn consume<R, F>(mut self, f: F) -> R
+    fn consume<R, F>(self, f: F) -> R
     where
-        F: FnOnce(&mut [u8]) -> R,
+        F: FnOnce(&[u8]) -> R,
     {
-        f(&mut self.buffer)
+        f(&self.buffer)
     }
 }