[zeromq-dev] Is ZMTP3 backwards compatibility with ZMTP1.0 broken?

[Merijn Verstraaten]

Hi!

RFC23 states that a backward compatibility detecting handshake starts as follows:
"Send a 10-octet pseudo-signature consisting of "%xFF size %x7F" where 'size' is the number of octets in the sender's identity (0 or greater) plus 1. The size SHALL be 8 octets in network byte order and occupies the padding field."

However, RFC13 states that ZMTP1.0 long length messages follow the format "%xFF size flags", where bit 0 of flags specifies whether there are more messages to come, which is wrong for an identity frame. Do existing ZMTP1.0 implementations simply ignore this flag on identity frames?

Cheers,
Merijn
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