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diff --git a/doc/zmq_tcp.txt b/doc/zmq_tcp.txt new file mode 100644 index 0000000..98f1219 --- /dev/null +++ b/doc/zmq_tcp.txt @@ -0,0 +1,93 @@ +zmq_tcp(7) +========== + + +NAME +---- +zmq_tcp - 0MQ unicast TCP transport over the network + + +SYNOPSIS +-------- +TCP is an ubiquitous unicast transport. When connecting distributed +applications, you will mostly use TCP transport. + + +CONNECTION STRING +----------------- +Connection string for TCP transport is "tcp://" followed by an IP address, +colon and port number. IP address can be either its numeric representation, +a NIC name or a hostname (resolved by DNS): + +---- + tcp://192.168.0.111:5555 + tcp://myserver001:80 + tcp://lo:32768 +---- + +Note that NIC names are not standardised by POSIX. They tend to be rather +arbitrary and platform dependent. Say, "eth0" on Linux would correspond to "en0" +on OSX and "e1000g" on Solaris. On Windows platform, as there are no short NIC +names available, you have to use numeric IP addresses instead. + + +WIRE FORMAT +----------- +A message consists of a message length followed by message data. +Size of message data MUST correspond to the message length. + +For messages of 0 to 254 octets, the length is represented by single octet. + +For messages of 255 or more octets the length is represented by a single octet +%xFF followed by a 64-bit unsigned integer length in network byte order. + +The protocol can be defined by this BNF grammar: + +---- + frame = length data + length = OCTET | escape 8*OCTET + escape = %xFF + data = *OCTET +---- + +Binary layout of a message (up to 254 bytes long): + +---- +0 1 2 3 +0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| Message size | Message body ... | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| Message body ... ++-+-+-+-+-+-+- ... +---- + +Binary layout of a larger message: + +---- +0 1 2 3 +0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| 0xff | Message size ... | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| Message size ... | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| Message size | Message body ... | ++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +| Message body ... ++-+-+-+-+-+-+-+ ... +---- + + +SEE ALSO +-------- +linkzmq:zmq_udp[7] +linkzmq:zmq_pgm[7] +linkzmq:zmq_ipc[7] +linkzmq:zmq_inproc[7] + + +AUTHOR +------ +Martin Sustrik <sustrik at 250bpm dot com> + |