[zeromq-dev] PicoTCP ZeroMQ implementation
Bruno D. Rodrigues
bruno.rodrigues at litux.org
Tue Jan 14 12:33:28 CET 2014
Inline
On Jan 14, 2014, at 11:19, Toon Peters <toon.peters at tass.be> wrote:
> Dear All,
>
> I'm currently trying to improve our ZeroMQ implementation on our TCP/IP stack called PicoTCP (All the source files can be found at http://github.com/tass-belgium/picotcp/)
>
> I'm currently trying to figure out all of the ZMTP 2.0 fields in the protocol, but I have noticed that some implementations don't really seem to adhere to the protocol.
>
> example: I'm using the pyzmq library and have one publisher and one subscriber. Here's what's happening on byte level:
>
> Sub -> Pub
> Signature: FF 00 00 00 00 00 00 00 01 7F ( the signature mentions 8 times 0x00, while the documentation below mentions 8 octets + 1. Could you provide any clarification here?
> Revision: 01 (= V2.0)
> Socket type: 02
FF + 8 bytes (ignore them?) + 7F
> Further bytes:
> 0x00 0x00 (=final short? what does the second byte stand for? length of body?)
> 0x00 0x01 0x01 (= body? What's the function of the body?)
greeting = signature revision socket-type identity
0x00 0x00 = final short value 0 = no identity
connection = greeting *message
0x00 0x01 0x01 = message final (no more) with short len = 1 and value = 1 means SUBSCRIBE (value 0 means UNSUBSCRIBE)
I guess if nothing follows, it’s the case of subscribe all (0 bytes)
>
> Pub -> Sub
> signature: FF 00 00 00 00 00 00 00 01 7F
> Revision: 01
> Socket type: 01
>
> Further bytes:
> 0x00 0x00 (=final short? nothing in the body?)
same identity situation
> 0x00 0x0C [Data] (shouldn't the first byte be 0x01 (more short))
message final without more, with 12 bytes following?
> When sending larger chunks of data (> 255 bytes), the data part changed into
> 0x02 0x00 0x00 0x00 0x00 0x00 0x00 0xAB 0xCD (= more-long ? But the start byte is not 0x03)
0x02 = message final without more, with 8 bytes len (43981 bytes?)
http://rfc.zeromq.org/spec:15
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