ZMQ_TCP(7) 0MQ Manual ZMQ_TCP(7) NAME zmq_tcp - 0MQ unicast transport using TCP SYNOPSIS TCP is an ubiquitous, reliable, unicast transport. When connecting distrib- uted applications over a network with 0MQ, using the TCP transport will likely be your first choice. ADDRESSING A 0MQ endpoint is a string consisting of a transport:// followed by an ad- dress. The transport specifies the underlying protocol to use. The address specifies the transport-specific address to connect to. For the TCP transport, the transport is tcp, and the meaning of the address part is defined below. Assigning a local address to a socket When assigning a local address to a socket using zmq_bind() with the tcp transport, the endpoint shall be interpreted as an interface followed by a colon and the TCP port number to use. An interface may be specified by either of the following: * The wild-card *, meaning all available interfaces. * The primary IPv4 or IPv6 address assigned to the interface, in its nu- meric representation. * The non-portable interface name as defined by the operating system. The TCP port number may be specified by: * A numeric value, usually above 1024 on POSIX systems. * The wild-card *, meaning a system-assigned ephemeral port. When using ephemeral ports, the caller should retrieve the actual assigned port using the ZMQ_LAST_ENDPOINT socket option. See zmq_getsockopt(3) for details. Unbinding wild-card address from a socket When wild-card * endpoint was used in zmq_bind(), the caller should use real endpoint obtained from the ZMQ_LAST_ENDPOINT socket option to unbind this endpoint from a socket using zmq_unbind(). Connecting a socket When connecting a socket to a peer address using zmq_connect() with the tcp transport, the endpoint shall be interpreted as a peer address followed by a colon and the TCP port number to use. You can optionally specify a source_endpoint which will be used as the source address for your connec- tion; tcp://source_endpoint;'endpoint', see the interface description above for details. A peer address may be specified by either of the following: * The DNS name of the peer. * The IPv4 or IPv6 address of the peer, in its numeric representation. Note: A description of the ZeroMQ Message Transport Protocol (ZMTP) which is used by the TCP transport can be found at http://rfc.zeromq.org/spec:23 HWM For the TCP transport, the high water mark (HWM) mechanism works in con- junction with the TCP socket buffers handled at OS level. Depending on the OS and several other factors the size of such TCP buffers will be differ- ent. Moreover TCP buffers provided by the OS will accommodate a varying number of messages depending on the size of messages (unlike ZMQ HWM set- tings the TCP socket buffers are measured in bytes and not messages). This may result in apparently inexplicable behaviors: e.g., you may expect that setting ZMQ_SNDHWM to 100 on a socket using TCP transport will have the effect of blocking the transmission of the 101-th message if the re- ceiver is slow. This is very unlikely when using TCP transport since OS TCP buffers will typically provide enough buffering to allow you sending much more than 100 messages. Of course if the receiver is slow, transmitting on a TCP ZMQ socket will eventually trigger the "mute state" of the socket; simply don't rely on the exact HWM value. Obviously the same considerations apply for the receive HWM (see ZMQ_RCVHWM). EXAMPLES Assigning a local address to a socket. // TCP port 5555 on all available interfaces rc = zmq_bind(socket, "tcp://*:5555"); assert (rc == 0); // TCP port 5555 on the local loop-back interface on all platforms rc = zmq_bind(socket, "tcp://127.0.0.1:5555"); assert (rc == 0); // TCP port 5555 on the first Ethernet network interface on Linux rc = zmq_bind(socket, "tcp://eth0:5555"); assert (rc == 0); Connecting a socket. // Connecting using an IP address rc = zmq_connect(socket, "tcp://192.168.1.1:5555"); assert (rc == 0); // Connecting using a DNS name rc = zmq_connect(socket, "tcp://server1:5555"); assert (rc == 0); // Connecting using a DNS name and bind to eth1 rc = zmq_connect(socket, "tcp://eth1:0;server1:5555"); assert (rc == 0); // Connecting using a IP address and bind to an IP address rc = zmq_connect(socket, "tcp://192.168.1.17:5555;192.168.1.1:5555"); assert (rc == 0); SEE ALSO zmq_bind(3) zmq_connect(3) zmq_pgm(7) zmq_ipc(7) zmq_inproc(7) zmq_vmci(7) zmq(7) AUTHORS This page was written by the 0MQ community. To make a change please read the 0MQ Contribution Policy at http://www.zeromq.org/docs:contributing. 0MQ 4.3.5 10/09/2023 ZMQ_TCP(7)
NAME | SYNOPSIS | ADDRESSING | HWM | EXAMPLES | SEE ALSO | AUTHORS
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