ZMQ_UDP - Online Linux Manual PageSection : 7
Updated : 01/21/2023
Source : 0MQ 4​.3​.4
Note : 0MQ Manual

NAMEzmq_udp − 0MQ UDP multicast and unicast transport

SYNOPSISUDP is unreliable protocol transport of data over IP networks​. UDP support both unicast and multicast communication​.

DESCRIPTIONUDP transport can only be used with the ZMQ_RADIO and ZMQ_DISH socket types​.

ADDRESSINGA 0MQ endpoint is a string consisting of a transport:// followed by an address​. The transport specifies the underlying protocol to use​. The address specifies the transport−specific address to connect to​. For the UDP transport, the transport is udp​. The meaning of the address part is defined below​. Binding a socket With 'udp' we can only bind the 'ZMQ_DISH' socket type​. When binding a socket using _zmq_bind()_ with the 'udp' transport the 'endpoint' shall be interpreted as an 'interface' followed by a colon and the UDP port number to use​. An 'interface' may be specified by either of the following: * The wild−card `*`, meaning all available interfaces​. * The name of the network interface (i​.e​. eth0, lo, wlan0 etc​.​.​.) * The primary address assigned to the interface, in its numeric representation​. * Multicast address in its numeric representation the socket should join​. The UDP port number may be specified a numeric value, usually above 1024 on POSIX systems​. Connecting a socketWith udp we can only connect the ZMQ_RADIO socket type​. When connecting a socket to a peer address using zmq_connect() with the udp transport, the endpoint shall be interpreted as a peer address followed by a colon and the UDP port number to use​. A peer address may be specified by either of the following: •  The IPv4 or IPv6 address of the peer, in its numeric representation or using its hostname​. •  Multicast address in its numeric representation​.

EXAMPLESBinding a socket. // Unicast − UDP port 5555 on all available interfaces rc = zmq_bind(dish, "udp://*:5555"); assert (rc == 0); // Unicast − UDP port 5555 on the local loop−back interface rc = zmq_bind(dish, "udp://127​.0​.0​.1:5555"); assert (rc == 0); // Unicast − UDP port 5555 on interface eth1 rc = zmq_bind(dish, "udp://eth1:5555"); assert (rc == 0); // Multicast − UDP port 5555 on a Multicast address rc = zmq_bind(dish, "udp://239​.0​.0​.1:5555"); assert (rc == 0); // Same as above but joining only on interface eth0 rc = zmq_bind(dish, "udp://eth0;239​.0​.0​.1:5555"); assert (rc == 0); // Same as above using IPv6 multicast rc = zmq_bind(dish, "udp://eth0;[ff02::1]:5555"); assert (rc == 0);Connecting a socket. // Connecting using an Unicast IP address rc = zmq_connect(radio, "udp://192​.168​.1​.1:5555"); assert (rc == 0); // Connecting using a Multicast address rc = zmq_connect(socket, "udp://239​.0​.0​.1:5555); assert (rc == 0); // Connecting using a Multicast address using local interface wlan0 rc = zmq_connect(socket, "udp://wlan0;239​.0​.0​.1:5555); assert (rc == 0); // Connecting to IPv6 multicast rc = zmq_connect(socket, "udp://[ff02::1]:5555); assert (rc == 0);

SEE ALSOzmq_connect(3) zmq_setsockopt(3) zmq_tcp(7) zmq_ipc(7) zmq_inproc(7) zmq_vmci(7) zmq(7)

AUTHORSThis page was written by the 0MQ community​. To make a change please read the 0MQ Contribution Policy at http://www​.zeromq​.org/docs:contributing​.
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