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+//
+// Copyright 2017 Garrett D'Amore <garrett@damore.org>
+//
+// This software is supplied under the terms of the MIT License, a
+// copy of which should be located in the distribution where this
+// file was obtained (LICENSE.txt). A copy of the license may also be
+// found online at https://opensource.org/licenses/MIT.
+//
+
+#ifndef CORE_DEVICE_H
+#define CORE_DEVICE_H
+
+// Device takes messages from one side, and forwards them to the other.
+// It works in both directions. Arguably we should build versions of this
+// that are unidirectional, and we could extend this API with user-defined
+// filtering functions.
+extern int nni_device(nni_sock *, nni_sock *);
+
+#endif // CORE_DEVICE_H