Pub-sub interoperability between 2.x and 3.x

Description

Currently it's unsafe to upgrade parts of a distributed network from 2.x to 3.x, since the pub-sub protocol was extended in 3.x (to upstream subscriptions). This issue is for adding version detection to the 3.x PUB and SUB sockets so they will emulate 2.x when talking to older components.

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Lourens Naudé August 5, 2012 at 12:11 AM

Hi Pieter,

Took a stab at back porting Martin Sustrik's 2.1 wire protocol compatibility patches from Crossroads I/O and added :

Docs for the ZMQ_PROTOCOL option
Stricter validation for the protocol version
Backwards compatibility is enabled with the socket option, which isn't ideal, but it's a card on the table. Thoughts on automatic detection ?

https://github.com/zeromq/zeromq3-x/pull/26