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| -rw-r--r-- | man/man7/zmq_tcp.7 | 62 |
1 files changed, 61 insertions, 1 deletions
diff --git a/man/man7/zmq_tcp.7 b/man/man7/zmq_tcp.7 index 0b9a596..391215e 100644 --- a/man/man7/zmq_tcp.7 +++ b/man/man7/zmq_tcp.7 @@ -2,7 +2,67 @@ .SH NAME TCP-based tranport for 0MQ .SH SYNOPSIS -.SH DESCRIPTION + +TCP is an ubiquitous unicast transport. When connecting distributed +applications, you will mostly use TCP transport. + +.SH CONNECTION STRING + +Connection string for TCP transport is "tcp://" followed by an IP adress, +colon and port number. IP address can be either its numeric representation, +a NIC name or a hostname (resolved by DNS): + +.nf + tcp://192.168.0.111:5555 + tcp://myserver001:80 + tcp://lo:32768 +.fi + +.SH 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: + +.nf + frame = length data + length = OCTET | escape 8*OCTET + escape = %xFF + data = *OCTET +.fi + +Binary layout of a message (up to 254 bytes long): + +.nf +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 ... ++-+-+-+-+-+-+-+ ... +.fi + .SH "SEE ALSO" .SH AUTHOR Martin Sustrik <sustrik at 250bpm dot com> |