[zeromq-dev] PyZMQ w/ 0mq 3.x

[Jason .]

Hi All,

I am looking at migrating from pyzmq with 0mq v2.2 to pyzmq with 0mq
3.x and am having some very basic issues I'm hoping someone can shed
some insight into.  For testing, I am looking at the wuserver/wuclient
PUB/SUB examples found in the python 0mq guide.

With 0mq 2.2 these examples work fine for me.  But when I upgrade to
3.x, the client appears to only receives empty messages.  I am
currently running on Ubuntu 12.04.

> python -c 'import zmq; print zmq.zmq_version()'
3.2.0

The client appears to connect:

> netstat -anl
tcp        0      0 0.0.0.0:5556            0.0.0.0:*               LISTEN
tcp        0      0 127.0.0.1:50695         127.0.0.1:5556          ESTABLISHED

I added in print messages for both the client and server to show every
message sent & received and commented out the post-receive processing:

wuserver:
     message = "%d %d %d" % (zipcode, temperature, relhumidity)
     print 'Sending %s' % message
     socket.send(message)

wuclient:
socket.setsockopt(zmq.SUBSCRIBE,'')
...
     print 'Received: -%s-' % string
     #zipcode, temperature, relhumidity = string.split()
     #total_temp += int(temperature)

The server side claims to be sending messages:
Sending 86498 -31 49
Sending 62351 21 27
Sending 30750 68 42
Sending 57048 50 50
Sending 2616 -72 43

And the client receives something, but no idea what:
Collecting updates from weather server
Received: --
Received: --
Received: --
Received: --
Received: --

If you have any suggestions, I would greatly appreciate it.

Thanks!
Jason