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+= nng_rep(7)
+//
+// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
+// Copyright 2018 Capitar IT Group BV <info@capitar.com>
+//
+// This document 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.
+//
+
+== NAME
+
+nng_rep - reply protocol
+
+== SYNOPSIS
+
+[source,c]
+----
+#include <nng/protocol/reqrep0/rep.h>
+
+int nng_rep0_open(nng_socket *s);
+----
+
+== DESCRIPTION
+
+(((protocol, _rep_)))
+The ((_rep_ protocol)) is one half of a ((request/reply pattern)).
+In this pattern, a requester sends a message to one replier, who
+is expected to reply.
+The request is resent if no reply arrives,
+until a reply is received or the request times out.
+
+TIP: This protocol is useful in setting up RPC-like services.
+It is also "`reliable`", in that a the requester will keep retrying until
+a reply is received.
+
+The _rep_ protocol is the replier side, and the
+<<nng_req.7#,_req_>> protocol is the requester side.
+
+=== Socket Operations
+
+The <<nng_rep_open.3#,`nng_rep0_open()`>> call creates a replier socket.
+This socket may be used to receive messages (requests), and then to send
+replies.
+Generally a reply can only be sent after receiving a request.
+(Attempts to receive a message will result in `NNG_ESTATE` if there
+is no outstanding request.)
+
+Attempts to send on a socket with no outstanding requests will result
+in `NNG_ESTATE`. 
+
+Raw mode sockets (set with <<nng_options.5#NNG_OPT_RAW,`NNG_OPT_RAW`>>)
+ignore all these restrictions.
+
+=== Protocol Versions
+
+Only version 0 of this protocol is supported.
+(At the time of writing, no other versions of this protocol have been defined.)
+
+==== Protocol Options
+
+The _rep_ protocol has no protocol-specific options.
+
+==== Protocol Headers
+
+(((backtrace)))
+The _rep_ protocol uses a _backtrace_ in the header.
+This is more fully documented in the <<nng_req.7#,_req_>> manual.
+    
+== SEE ALSO
+
+<<nng_rep_open.3#,nng_rep_open(3)>>,
+<<nng.7#,nng(7)>>,
+<<nng_req.7#,nng_req(7)>>