[zeromq-dev] Compatibility ZMQ3 - ZMQ4

Pieter Hintjens ph at imatix.com
Tue Feb 11 16:47:43 CET 2014

Hi Emmanuel,

> If I run processes acting as SUB using ZMQ 4.0.3, will I have
> compatibility problems between my PUB and SUB?
> Is ZMQ 3.2.X compatible with ZMQ 4.0.3?

Yes, fully compatible. The protocol has changed but ZMQ 4.0.3 will
revert to using the ZMTP v2 protocol when it detects a ZMQ 3.2.x peer.


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