[zeromq-dev] ZeroMQ with Python and a basic task

Michael Cuggy mcuggy at gmail.com
Sat Mar 7 08:22:28 CET 2015

Yes, I was running a corresponding Python script to listen on port 5555.

My nmap commands show that port 5555 was "closed" and not "filtered."
That is consistent with the firewall rules allowing connectivity over
port 5555.  (A software firewall or hardware firewall that blocked
port 5555 would show "filtered.")

Can you show me a specific client chat program?  I tried to find one
off the Internet.  I'd prefer it to be in Python.  But it doesn't have
to be.  I just want to use ZeroMQ in a practical way like creating a
chat room.  I want access to the source code.  I'd like to see one
from this plethora.  Thank you very much for your response.  I look
forward to getting a second response.

On 3/1/15, Kenneth Adam Miller <kennethadammiller at gmail.com> wrote:
> On your example, are you running the requisite request receiver, eg the
> python script that binds to port 5555 in order that the server can have
> something to connect to? Just checking.
> Well it depends on what all you want it to do in what scenario. If these
> are two typical user machines, you might need tcp hole punching to get past
> firewalls to start with. There's libraries for that, and I'll probably go
> through that soon for my application.
> Also, you don't have to start from scratch, you could easily work from one
> of the plethora of existing messaging clients and extend them, or at least
> read their source to see how they work.
> On Mon, Mar 2, 2015 at 12:29 AM, Michael Cuggy <mcuggy at gmail.com> wrote:
>> Hello,
>> I am using RHEL v. 7.x on AWS.  I installed ZeroMQ 4.0.5.  I want to
>> create a basic program using Python and ZeroMQ that serves as a chat
>> service for human users using Linux on a LAN.
>> I have made a significant effort.  I installed the prerequisites for
>> ZeroMQ and ZeroMQ itself. I installed the Python bindings.
>> The problem is that I cannot even get a Hello World program to work on
>> one server.  But I used the Hello World program that was on the
>> zeromq.org page. (http://zguide.zeromq.org/py:hwclient)
>> Here is what I get (after running python hello.py):
>> "Connecting to hello world server
>> Sending request 0"
>> It pauses indefinitely after this.  I have to escape out with Ctrl-c.
>> Can I get step-by-step directions on how to create a messaging program
>> using Python and Zeromq?  I just want it to work between two Linux
>> machines to start with.  It is just problem after problem.  If no one
>> knows of such documentation, can someone please tell me why I cannot
>> see "Hello World" via the Python program that ZeroMQ.org provides?  To
>> me it just
>> pauses after "Sending request 0."
>> thanks,
>> Mike
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