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+//
+// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2018 Capitar IT Group BV <info@capitar.com>
+//
+// 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 NNG_COMPAT_REQREP_H
+#define NNG_COMPAT_REQREP_H
+
+// This header contains interfaces that are intended to offer compatibility
+// with nanomsg v1.0. These are not the "preferred" interfaces for nng,
+// and consumers should only use these if they are porting software that
+// previously used nanomsg. New programs should use the nng native APIs.
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// REQ and REP sockopt level.
+#define NN_PROTO_REQREP 3
+#define NN_REQ (NN_PROTO_REQREP * 16 + 0)
+#define NN_REP (NN_PROTO_REQREP * 16 + 1)
+
+// REQ options. (REP has none.)
+#define NN_REQ_RESEND_IVL (NN_REQ * 16 + 1)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NNG_COMPAT_REQREP_H