1 files changed, 35 insertions, 0 deletions
diff --git a/pw_router/public/pw_router/egress.h b/pw_router/public/pw_router/egress.h
new file mode 100644
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+++ b/pw_router/public/pw_router/egress.h
@@ -0,0 +1,35 @@
+// Copyright 2021 The Pigweed Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+#pragma once
+
+#include <span>
+
+#include "pw_bytes/span.h"
+#include "pw_status/status.h"
+
+namespace pw::router {
+
+// Data egress for a router to send packets over some transport system.
+class Egress {
+ public:
+  virtual ~Egress() = default;
+
+  // Sends a complete packet/frame over the transport. Returns OK on success, or
+  // an error status on failure.
+  //
+  // TODO(frolv): Document possible return values.
+  virtual Status SendPacket(ConstByteSpan packet) = 0;
+};
+
+}  // namespace pw::router