[zeromq-dev] Failed to use zeromq2.2 to communicate with zeromq4.0.1

[Pieter Hintjens]

Hi,

OK, I tested this across two machines, and you're absolutely right.
When the router is running 2.2 and the dealer 4.0, there's an extra
null message produced by the router. Here's a typical dump of messages
the router delivers:

--------------------------------------
[017] 00496C3B250C0042ABA57F226547411A77
[000]
--------------------------------------
[017] 00496C3B250C0042ABA57F226547411A77
[006] 48656C6C6F00

The null message is sent when the dealer connects, even if it does not
send any other message. I'm raising an issue, here:

https://github.com/zeromq/libzmq/issues/763

-Pieter