net: add packet-trace feature.

2 files changed, 14 insertions, 2 deletions

diff --git a/embassy-net/Cargo.toml b/embassy-net/Cargo.toml
index 67f0bd028..864956616 100644
--- a/embassy-net/Cargo.toml
+++ b/embassy-net/Cargo.toml
@@ -28,6 +28,9 @@ std = []
 ## Enable defmt
 defmt = ["dep:defmt", "smoltcp/defmt", "embassy-net-driver/defmt", "heapless/defmt-03"]
 
+## Trace all raw received and transmitted packets using defmt or log.
+packet-trace = []
+
 #! Many of the following feature flags are re-exports of smoltcp feature flags. See 
 #! the [smoltcp feature flag documentation](https://github.com/smoltcp-rs/smoltcp#feature-flags)
 #! for more details
diff --git a/embassy-net/src/device.rs b/embassy-net/src/device.rs
index 54a0c47e8..3b1d3c47c 100644
--- a/embassy-net/src/device.rs
+++ b/embassy-net/src/device.rs
@@ -76,7 +76,11 @@ where
     where
         F: FnOnce(&mut [u8]) -> R,
     {
-        self.0.consume(|buf| f(buf))
+        self.0.consume(|buf| {
+            #[cfg(feature = "packet-trace")]
+            trace!("rx: {:?}", buf);
+            f(buf)
+        })
     }
 }
 
@@ -92,6 +96,11 @@ where
     where
         F: FnOnce(&mut [u8]) -> R,
     {
-        self.0.consume(len, |buf| f(buf))
+        self.0.consume(len, |buf| {
+            let r = f(buf);
+            #[cfg(feature = "packet-trace")]
+            trace!("tx: {:?}", buf);
+            r
+        })
     }
 }