# nng_pub(7) Manual Page

## NAME

nng_pub - publisher protocol

## SYNOPSIS

    #include <nng/protocol/pubsub0/pub.h>

## DESCRIPTION

The pub 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 pub protocol is the publisher side, and the sub protocol is the subscriber side.

| 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 `nng_pub0_open()` functions create a publisher socket. This socket may be used to send messages, but is unable to receive them. Attempts to receive 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 pub protocol has no protocol-specific options.

### Protocol Headers

The pub protocol has no protocol-specific headers.

## SEE ALSO

nng_pub_open(3), nng_sub(7), nng(7)