ØMQ Manual - ØMQ/4.2.2
zmq_udp - ØMQ UDP multicast and unicast transport
UDP is unreliable protocol transport of data over IP networks. UDP support both unicast and multicast communication.
UDP transport can only be used with the ZMQ_RADIO and ZMQ_DISH socket types.
A ØMQ 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 primary IPv4 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 socket
With 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.
- Multicast address in its numeric representation.
Binding 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); // Multicast - UDP port 5555 on a Multicast address rc = zmq_bind(dish, "udp://188.8.131.52:5555"); 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://184.108.40.206:5555); assert (rc == 0);
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