Issue with DLMS Communication via TCP/IP with Moxa Device

Hello everyone,

I am currently working on a project where I need to communicate with an electricity meter using the DLMS/COSEM protocol via a Moxa device that acts as a TCP/IP converter. However, I am encountering an issue during the initialization of the DLMS session.

Here is the relevant part of my Python code:

from gurux_dlms.GXDLMSClient import GXDLMSClient
from gurux_net.GXNet import GXNet
from gurux_net.enums.NetworkType import NetworkType
from gurux_common.enums.TraceLevel import TraceLevel
import socket

# IP address and port of the Moxa device
MOXA_IP = "10.206.165.1"
MOXA_PORT = 4012

# Meter addresses
LOGICAL_ADDRESS = 1
HDLC_ADDRESS = 8209

# Set global timeout for sockets
socket.setdefaulttimeout(10)

try:
    # Configure TCP connection with Moxa
    connection = GXNet(NetworkType.TTCP, MOXA_IP, MOXA_PORT)

    # Configure DLMS client
    client = GXDLMSClient(
        useLogicalNameReferencing=True,
        clientAddress=LOGICAL_ADDRESS,
        serverAddress=HDLC_ADDRESS
    )
    client.trace = TraceLevel.VERBOSE

    # Open connection
    connection.open()

    # Initialize DLMS session
    snrm_request = client.snrmRequest()
    connection.send(snrm_request)

    # Receive SNRM response
    snrm_response = connection.receive(1024)
    print(f"SNRM Response: {snrm_response}")
    print(f"Type of SNRM Response: {type(snrm_response)}")
    if snrm_response is None:
        raise Exception("No response received for SNRM request.")
    if isinstance(snrm_response, int):
        raise Exception("Received an int value instead of the expected object.")
    client.parseUAResponse(snrm_response)

    # Send AARQ request
    aarq_request = client.aarqRequest()
    connection.send(aarq_request)

    # Receive AARQ response
    aarq_response = connection.receive(1024)
    if aarq_response is None:
        raise Exception("No response received for AARQ request.")
    client.parseAAREResponse(aarq_response)

    # Read data from the meter
    cosem_object = "1.1.1.8.0.255"
    data = client.read(connection, cosem_object)
    print(f"Read value: {data}")

except Exception as e:
    print(f"Communication error: {e.__class__.__name__} - {e}")
finally:
    try:
        connection.close()
    except Exception as e:
        print(f"Error closing connection: {e}")

The issue I am facing is that I receive an AttributeError: 'int' object has no attribute 'eop' when waiting for the SNRM response. The debug output shows that the type of snrm_response is int, which is unexpected.

Here is the debug output:

Creating TCP connection with Moxa...
Connection created: TCP 10.206.165.1:4012
DLMS client configured: <gurux_dlms.GXDLMSClient.GXDLMSClient object at 0x000001A7B52C3040>
Connecting to Moxa at 10.206.165.1:4012...
Connected to Moxa.
Initializing DLMS session...
SNRM Request: bytearray(b'~\xa0\x08\x80#\x03\x93&`~')
Waiting for SNRM response...
Communication error: AttributeError - 'int' object has no attribute 'eop'
Closing connection...
Connection closed.

I would appreciate any insights or suggestions on what might be causing this issue and how to resolve it.

Thank you in advance for your help!