[zeromq-dev] ZMTP greeting

Chris Laws clawsicus at gmail.com
Tue Jul 8 17:09:14 CEST 2014

I'm playing around with a ZMTP implementation and I notice that other ZMTP
implementations seem to be setting the second last byte of the ZMTP
signature to \x01 (the byte before the last \x7F).

The various ZMTP specs (15, 23, 37) indicate that the 8 bytes between the
\xFF and \x7F should be \x00 or insignificant ignored bytes. Yet
implementations such as libzmtp and libzmq are explicitly setting this byte
to \x01.

Does this field in the ZMTP greeting actually represent something?

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