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 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 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:
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); // 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);
zmq_connect(3) zmq_setsockopt(3) zmq_tcp(7) zmq_ipc(7) zmq_inproc(7) zmq_vmci(7) zmq(7)
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