Issue " connection being refused after dockerize and running mininet " about iec62056-21

[skv02]

Here is my client file. i need a small suggestion if my client is implemented good regarding with_tcp_transport() function.

from logging import addLevelName
import string
import random
from random import randint
from iec62056_21.client import Iec6205621Client

HOST = '127.0.0.1'

PORT = 8081

address = (HOST, PORT)

def int_generator(chars=range(0, 250000)):
"""Function to generate random integers with with specified size"""
return random.choice(chars)

#-----------------------------------------------------------------------#

Initialize Iec6205621Client instance with tcp

#-----------------------------------------------------------------------#
def Run_client():

 client = Iec6205621Client.with_tcp_transport(address=(HOST, PORT))

 print("socket created")
 
 client.connect()
 
 print("connected with server successfully")

 number_of_data_to_send = 100

 sent_data = 0
 while(sent_data < number_of_data_to_send):
     data = int_generator()
     client.write_single_value(address=address, data=data)
     sent_data+=1

 client.disconnect()
 
 print("client disconnected")

if name == "main":
Run_client()

[Krolken]

Hi.

You are getting a ConnectionRefusedError on the TCP connection. There is no service to receive your connection. If you are running them as docker containers I would assume that you have to reference the other containers IP or hostname, not the loopback interface 127.0.0.1

[skv02]

Here is my server file. as you mentioned , my server here is accepting the service connection from client side. Can you provide some more idea, As you said there is no service to recieve my connection.

HOST = '127.0.0.1' # Standard loopback interface address (localhost)

PORT = 8081 # Port to listen on (non-privileged ports are > 1023)

address = (HOST, PORT)

recieved_data = []

ack = "\x06"

byte_ack = bytes(ack, 'utf-8')

#---------------------------------------------------------------------#
#initialising server to accept client connection
#---------------------------------------------------------------------#

def run_server():

with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as server:
  
     print("socket created")

     server.bind((HOST, PORT))
     server.listen()

     print("waiting for connections")

     print ('Listening on .... ', (HOST, PORT))

     conn, address = server.accept()

     with conn:
         print('Successfully connected with', address)
         while True:
             data = conn.recv(1024)
             # Stop loop if no more data is received
             if not data:
                 break
             recieved_data.append(data)
             # Sending an ack in bytes to meter
             conn.sendall(byte_ack)

         print(recieved_data)
 
server.close()
print("server diconnected")

if name == "main":
run_server()

[Krolken]

If you are using docker you cannot use the loopback interface to bind the service on as this is not available outside of the container. You also need to set up correct port exposing for the container.

I'm gonna close this issue since it is related to docker and/or networking and not this library.