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140 lines
4.3 KiB
140 lines
4.3 KiB
5 years ago
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'\" t
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.\" Title: zmq_udp
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.\" Author: [see the "AUTHORS" section]
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.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
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.\" Date: 02/18/2017
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.\" Manual: 0MQ Manual
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.\" Source: 0MQ 4.2.2
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.\" Language: English
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.\"
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.TH "ZMQ_UDP" "7" "02/18/2017" "0MQ 4\&.2\&.2" "0MQ Manual"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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zmq_udp \- 0MQ UDP multicast and unicast transport
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.SH "SYNOPSIS"
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.sp
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UDP is unreliable protocol transport of data over IP networks\&. UDP support both unicast and multicast communication\&.
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.SH "DESCRIPTION"
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.sp
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UDP transport can only be used with the \fIZMQ_RADIO\fR and \fIZMQ_DISH\fR socket types\&.
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.SH "ADDRESSING"
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.sp
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A 0MQ endpoint is a string consisting of a \fItransport\fR:// followed by an \fIaddress\fR\&. The \fItransport\fR specifies the underlying protocol to use\&. The \fIaddress\fR specifies the transport\-specific address to connect to\&.
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.sp
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For the UDP transport, the transport is udp\&. The meaning of the \fIaddress\fR part is defined below\&.
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.sp
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Binding a socket
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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With \*(Aqudp\*(Aq we can only bind the \*(AqZMQ_DISH\*(Aq socket type\&.
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When binding a socket using _zmq_bind()_ with the \*(Aqudp\*(Aq
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transport the \*(Aqendpoint\*(Aq shall be interpreted as an \*(Aqinterface\*(Aq followed by a
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colon and the UDP port number to use\&.
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An \*(Aqinterface\*(Aq may be specified by either of the following:
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* The wild\-card `*`, meaning all available interfaces\&.
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* The primary IPv4 address assigned to the interface, in its numeric
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representation\&.
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* Multicast address in its numeric representation the socket should join\&.
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The UDP port number may be specified a numeric value, usually above 1024 on POSIX systems\&.
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Connecting a socket
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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With \fIudp\fR we can only connect the \fIZMQ_RADIO\fR socket type\&. When connecting a socket to a peer address using \fIzmq_connect()\fR with the \fIudp\fR transport, the \fIendpoint\fR shall be interpreted as a \fIpeer address\fR followed by a colon and the UDP port number to use\&.
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.sp
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A \fIpeer address\fR may be specified by either of the following:
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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The IPv4 or IPv6 address of the peer, in its numeric representation\&.
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.RE
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.sp
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.RS 4
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.ie n \{\
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\h'-04'\(bu\h'+03'\c
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.\}
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.el \{\
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.sp -1
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.IP \(bu 2.3
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.\}
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Multicast address in its numeric representation\&.
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.RE
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.SH "EXAMPLES"
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.PP
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\fBBinding a socket\fR.
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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// Unicast \- UDP port 5555 on all available interfaces
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rc = zmq_bind(dish, "udp://*:5555");
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assert (rc == 0);
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// Unicast \- UDP port 5555 on the local loop\-back interface
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rc = zmq_bind(dish, "udp://127\&.0\&.0\&.1:5555");
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assert (rc == 0);
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// Multicast \- UDP port 5555 on a Multicast address
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rc = zmq_bind(dish, "udp://239\&.0\&.0\&.1:5555");
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assert (rc == 0);
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.fi
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.if n \{\
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.RE
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.\}
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.PP
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\fBConnecting a socket\fR.
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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// Connecting using an Unicast IP address
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rc = zmq_connect(radio, "udp://192\&.168\&.1\&.1:5555");
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assert (rc == 0);
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// Connecting using a Multicast address"
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rc = zmq_connect(socket, "udp://239\&.0\&.0\&.1:5555);
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assert (rc == 0);
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.SH "SEE ALSO"
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.sp
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\fBzmq_connect\fR(3) \fBzmq_setsockopt\fR(3) \fBzmq_tcp\fR(7) \fBzmq_ipc\fR(7) \fBzmq_inproc\fR(7) \fBzmq_vmci\fR(7) \fBzmq\fR(7)
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.SH "AUTHORS"
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.sp
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This page was written by the 0MQ community\&. To make a change please read the 0MQ Contribution Policy at \m[blue]\fBhttp://www\&.zeromq\&.org/docs:contributing\fR\m[]\&.
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