C# to Python messaging

Question

I want to send and receive very simple data (doesn't matter what form) from/to C# to/from a python program on a raspberry pi using ZeroMQ. For my server side I am using the following C# code:

using System;
using System.Threading;
using NetMQ;
using NetMQ.Sockets;

namespace NetMQServer
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var server = new ResponseSocket())
            {
                server.Bind("tcp://*:5555");
                while (true)
                {
                    Console.ReadKey();
                    var message = server.ReceiveFrameString();
                    Console.WriteLine("Received {0}", message);
                    // processing the request
                    Console.WriteLine("Sending World");
                    server.SendFrame("World");
                }
            }
        }
    }
}

and on the client side (python) I am using the following code:

import zmq

context = zmq.Context()
socket = context.socket(zmq.REQ)
socket.connect("tcp://192.168.1.14:5555")

for i in range(0, 10):
    print("Sending Hello")
    socket.send_string("Hello")
    msg = socket.recv_string()
    print("recieved ", msg)
    print("")

both programs run but it does not print anything in the console as if they are not connected. I have tried it with both client and server in the same language with the exact same codes above and it works.

Answer 1

I run your code on a local machine and cannot reproduce your issue - an interaction between client and server works fine.

Just one remark, this code:

Console.ReadKey();

should be removed from the server-side.

---

I would recommend:

• make sure that all works on a local machine
• check that port 5555 is available (not blocked by a firewall, etc) from the client-side. To test it can be used telnet utility:

telnet 192.168.1.14 5555