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authorGarrett D'Amore <garrett@damore.org>2024-10-14 18:08:13 -0700
committerGarrett D'Amore <garrett@damore.org>2024-10-14 18:08:13 -0700
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-= nng_sub(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_sub - subscriber protocol
-
-== SYNOPSIS
-
-[source,c]
-----
-#include <nng/nng.h>
-#include <nng/protocol/pubsub0/sub.h>
-----
-
-== DESCRIPTION
-
-(((protocol, _sub_)))
-The ((_sub_ protocol)) is one half of a publisher/((subscriber)) pattern.
-In this pattern, a publisher sends data, which is broadcast to all subscribers.
-The subscribing applications only see the data to which they have subscribed.
-
-The _sub_ protocol is the subscriber side, and the
-xref:nng_pub.7.adoc[_pub_] protocol is the publisher side.
-
-NOTE: In this implementation, the publisher delivers all messages to all
-subscribers.
-The subscribers maintain their own subscriptions, and filter them locally.
-Thus, this pattern should not be used in an attempt to
-reduce bandwidth consumption.
-
-The topics that subscribers subscribe to is just the first part of
-the message body.
-Applications should construct their messages accordingly.
-
-=== Socket Operations
-
-The xref:nng_sub_open.3.adoc[`nng_sub0_open()`] functions create a subscriber socket.
-This socket may be used to receive messages, but is unable to send them.
-Attempts to send messages will result in `NNG_ENOTSUP`.
-
-=== 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 following protocol-specific options are available.
-
-((`NNG_OPT_SUB_SUBSCRIBE`))(((subscribe)))::
-
- This option registers a topic that the subscriber is interested in.
- The option is write-only, and takes an array of bytes, of arbitrary size.
- Each incoming message is checked against the list of subscribed topics.
- If the body begins with the entire set of bytes in the topic, then the
- message is accepted. If no topic matches, then the message is
- discarded.
-+
-NOTE: This option is a byte array. Thus if you use
-xref:nng_socket_set.3.adoc[`nng_socket_set_string()`] the `NUL` terminator byte will
-be included in the topic.
-If that isn't desired, consider using
-xref:nng_socket_set.3.adoc[`nng_socket_set()`] and using `strlen()` of the topic
-as the topic size.
-+
-TIP: To receive all messages, an empty topic (zero length) can be used.
-
-((`NNG_OPT_SUB_UNSUBSCRIBE`))::
-
- This option, also write-only, removes a topic from the subscription list.
- Note that if the topic was not previously subscribed to with
- `NNG_OPT_SUB_SUBSCRIBE` then an `NNG_ENOENT` error will result.
-
-((`NNG_OPT_SUB_PREFNEW`))::
-
- (`bool`)
- This read/write option specifies the behavior of the subscriber when the queue is full.
- When `true` (the default), the subscriber will make room in the queue by removing the oldest message.
- When `false`, the subscriber will reject messages if the message queue does not have room.
-
-=== Protocol Headers
-
-The _sub_ protocol has no protocol-specific headers.
-
-== SEE ALSO
-
-[.text-left]
-xref:nng_sub_open.3.adoc[nng_sub_open(3)],
-xref:nng_pub.7.adoc[nng_pub(7)],
-xref:nng.7.adoc[nng(7)]