1ZMQ_UDP(7)                        0MQ Manual                        ZMQ_UDP(7)
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NAME

6       zmq_udp - 0MQ UDP multicast and unicast transport
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SYNOPSIS

9       UDP is unreliable protocol transport of data over IP networks. UDP
10       support both unicast and multicast communication.
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DESCRIPTION

13       UDP transport can only be used with the ZMQ_RADIO and ZMQ_DISH socket
14       types.
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ADDRESSING

17       A 0MQ endpoint is a string consisting of a transport:// followed by an
18       address. The transport specifies the underlying protocol to use. The
19       address specifies the transport-specific address to connect to.
20
21       For the UDP transport, the transport is udp. The meaning of the address
22       part is defined below.
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24       Binding a socket
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26           With 'udp' we can only bind the 'ZMQ_DISH' socket type.
27           When binding a socket using _zmq_bind()_ with the 'udp'
28           transport the 'endpoint' shall be interpreted as an 'interface' followed by a
29           colon and the UDP port number to use.
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31           An 'interface' may be specified by either of the following:
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33           * The wild-card `*`, meaning all available interfaces.
34           * The name of the network interface (i.e. eth0, lo, wlan0 etc...)
35           * The primary address assigned to the interface, in its numeric representation.
36           * Multicast address in its numeric representation the socket should join.
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38           The UDP port number may be specified a numeric value, usually above
39           1024 on POSIX systems.
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41           Connecting a socket
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43       With udp we can only connect the ZMQ_RADIO socket type. When connecting
44       a socket to a peer address using zmq_connect() with the udp transport,
45       the endpoint shall be interpreted as a peer address followed by a colon
46       and the UDP port number to use.
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48       A peer address may be specified by either of the following:
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50       •   The IPv4 or IPv6 address of the peer, in its numeric representation
51           or using its hostname.
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53       •   Multicast address in its numeric representation.
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EXAMPLES

56       Binding a socket.
57
58           //  Unicast - UDP port 5555 on all available interfaces
59           rc = zmq_bind(dish, "udp://*:5555");
60           assert (rc == 0);
61           //  Unicast - UDP port 5555 on the local loop-back interface
62           rc = zmq_bind(dish, "udp://127.0.0.1:5555");
63           assert (rc == 0);
64           //  Unicast - UDP port 5555 on interface eth1
65           rc = zmq_bind(dish, "udp://eth1:5555");
66           assert (rc == 0);
67           //  Multicast - UDP port 5555 on a Multicast address
68           rc = zmq_bind(dish, "udp://239.0.0.1:5555");
69           assert (rc == 0);
70           //  Same as above but joining only on interface eth0
71           rc = zmq_bind(dish, "udp://eth0;239.0.0.1:5555");
72           assert (rc == 0);
73           //  Same as above using IPv6 multicast
74           rc = zmq_bind(dish, "udp://eth0;[ff02::1]:5555");
75           assert (rc == 0);
76
77       Connecting a socket.
78
79           //  Connecting using an Unicast IP address
80           rc = zmq_connect(radio, "udp://192.168.1.1:5555");
81           assert (rc == 0);
82           //  Connecting using a Multicast address
83           rc = zmq_connect(socket, "udp://239.0.0.1:5555);
84           assert (rc == 0);
85           //  Connecting using a Multicast address using local interface wlan0
86           rc = zmq_connect(socket, "udp://wlan0;239.0.0.1:5555);
87           assert (rc == 0);
88           //  Connecting to IPv6 multicast
89           rc = zmq_connect(socket, "udp://[ff02::1]:5555);
90           assert (rc == 0);
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SEE ALSO

94       zmq_connect(3) zmq_setsockopt(3) zmq_tcp(7) zmq_ipc(7) zmq_inproc(7)
95       zmq_vmci(7) zmq(7)
96

AUTHORS

98       This page was written by the 0MQ community. To make a change please
99       read the 0MQ Contribution Policy at
100       http://www.zeromq.org/docs:contributing.
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1040MQ 4.3.4                         07/23/2021                        ZMQ_UDP(7)
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