how to include 'Class' in Accounting Request?

[binooetomo]

Dear All

I make a small modification to https://github.com/pyradius/pyrad/blob/master/example/acct.py to make it send a 'start', some 'Interim-update', and 'stop'

here it is

#!/usr/bin/python
from __future__ import print_function
from pyrad.client import Client
from pyrad.dictionary import Dictionary
import random
import socket
import sys
import pyrad.packet
import time
from uuid import uuid4
# Ref: https://github.com/pyradius/pyrad/blob/master/example/acct.py
secret = b"testing123"
rclass = str(uuid4())

def SendPacket(srv, req):
    try:
        srv.SendPacket(req)
    except pyrad.client.Timeout:
        print("RADIUS server does not reply")
        pass
    except socket.error as error:
        print("Network error: " + error[1])
        pass

srv = Client(server="localhost", secret=secret, dict=Dictionary("dictionary"))

req = srv.CreateAcctPacket(User_Name="wichert")

req["NAS-IP-Address"] = "192.168.1.10"
req["NAS-Port"] = 0
req["NAS-Identifier"] = "trillian"
req["Called-Station-Id"] = "00-04-5F-00-0F-D1"
req["Calling-Station-Id"] = "00-01-24-80-B3-9C"
req["Framed-IP-Address"] = "10.0.0.100"
# req["Class"] = rclass
print("Sending accounting start packet")
req["Acct-Status-Type"] = "Start"
SendPacket(srv, req)


octet = 2
act_time = 0
period = 5
length = 20
for i in range(length):
    octet += 100
    act_time += period
    req["Acct-Status-Type"] = 3
    req["Acct-Input-Octets"] = octet
    req["Acct-Output-Octets"] = octet
    req["Acct-Session-Time"] = act_time
    print("Sending accounting Interim-update")
    SendPacket(srv, req)
    time.sleep(period)

    octet += 100
    act_time += period

print("Sending accounting stop packet")
req["Acct-Status-Type"] = "Stop"
req["Acct-Input-Octets"] = octet
req["Acct-Output-Octets"] = octet
req["Acct-Session-Time"] = act_time
req["Acct-Terminate-Cause"] = random.choice(["User-Request", "Idle-Timeout"])
SendPacket(srv, req)

it work without problem.

but if i include the 'req["Class"] = rclass', it generate traceback

Traceback (most recent call last):
  File "/opt/flaskradius/./test_acct.py", line 35, in <module>
    req["Class"] = rclass
  File "/opt/flaskradius/venv/lib/python3.9/site-packages/pyrad/packet.py", line 359, in __setitem__
    (key, item) = self._EncodeKeyValues(key, item)
  File "/opt/flaskradius/venv/lib/python3.9/site-packages/pyrad/packet.py", line 279, in _EncodeKeyValues
    return (key, [self._EncodeValue(attr, v) for v in values])
  File "/opt/flaskradius/venv/lib/python3.9/site-packages/pyrad/packet.py", line 279, in <listcomp>
    return (key, [self._EncodeValue(attr, v) for v in values])
  File "/opt/flaskradius/venv/lib/python3.9/site-packages/pyrad/packet.py", line 254, in _EncodeValue
    result = tools.EncodeAttr(attr.type, value)
  File "/opt/flaskradius/venv/lib/python3.9/site-packages/pyrad/tools.py", line 185, in EncodeAttr
    return EncodeOctets(value)
  File "/opt/flaskradius/venv/lib/python3.9/site-packages/pyrad/tools.py", line 24, in EncodeOctets
    if str.startswith(b'0x'):
TypeError: startswith first arg must be str or a tuple of str, not bytes

As far as I know, the Radius 'Class' Attribute is a string, and I generate it with --> str(uuid4()).
I need to include 'Class' since I'm trying to build a Flask based app as backend of FreeRadius.

Kindly please tell me how to include 'Class' in radius Accounting Request.

Sincerely
-bino-