[zeromq-dev] empty packet if REQ

[Martin Sustrik]

Ilja,

> thank you for shedding some light on this.
> Without it examples one can see e.g. in your "A multithreaded server in 10 mins"
> are slightly mysterious.
> 
> To be honest I haven't get why XREQ don't put null packet though.

Think of multiple devices on the path:

REQ --- device1 --- device2 --- REP

There should be just one null delimiting the backtrace stack. Thus it 
has to be inserted by the endpoint rather than the device.

Martin