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

[MinRK]

Hello World is a client + server example. You need to be running the
hwserver program, described above the link to hwclient in the Guide. The
Python version *should* be available at http://zguide.zeromq.org/py:hwserver,
but for some reason the hwserver links aren’t in the Guide. You can find it in
the examples repo
<https://github.com/imatix/zguide/blob/master/examples/Python/hwserver.py>
in the meantime.

-MinRK
​

On Sat, Mar 7, 2015 at 8:47 PM, Michael Cuggy <mcuggy at gmail.com> wrote:

> Hello,
>
> "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?"
>
> Yes, I think so.  Can you help me with this as I seem to have made a
> mistake?
>
> To be honest, I thought it was supposed to run by itself with no other
> server:
>
> http://zguide.zeromq.org/py:hwclient
>
> The loop back address in the code snippet above made me think it could
> be a standalone test.  I have a pair of Linux servers.
>
> One server has this:
> http://pastebin.com/nGc36Dq1
>
> A second server has this:
> http://pastebin.com/EVzCSKMn
>
> When I run both, I only see this:
>
> Connecting to hello world server...
> Sending request 0 ...
>
> It just hangs forever.  I don't think there is a security restriction
> preventing the communication.*  But the communication never happens,
> so I don't know what is wrong.
>
> thanks,
>
> Mike
>
> * I ran an nmap command to test connectivity on port 5555 on both
> servers.  The results indicate that the port isn't being blocked.  It
> says "closed" and not "filtered."  Filtered would indicate that the
> nmap utility's probe was being dropped.  A probe being dropped means
> that a firewall is blocking connectivity on that port.  This is not
> the case.  "Closed" indicates a lack of usage but not firewall
> blockage.
>
> I therefore don't understand how to get ZeroMQ working using the
> Python code on zeromoq.org.
>
>
> 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
> >> _______________________________________________
> >> zeromq-dev mailing list
> >> zeromq-dev at lists.zeromq.org
> >> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
> >>
> >
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