Not able to receive any notification from netconf test tool [closed]

I am working with netconf test tool to simulate devices. I was able to edit configuration on the devices. I was working with notification even tough I subscribed to a stream I was not able to get any notification from the device. If anybody has an understanding or have worked on netconf test tool with notification, it would be a great help .

Here is my python code

import sys import logging from ncclient import manager from ncclient import operations  log = logging.getLogger(__name__)  CREATE_SUBSCRIPTION = '''<?xml version="1.0" encoding="UTF-8"?>   <rpc xmlns="urn:ietf:params:xml:ns:netconf:base:1.0" message-id="{}">     <create-subscription xmlns="urn:ietf:params:xml:ns:netconf:notification:1.0">       <stream>NETCONF</stream>     </create-subscription>   </rpc>''' # Fill the device information and establish a NETCONF session def connect(host, port, user, password):     return manager.connect(host=host,                            port=port,                            username=user,                            password=password,                            hostkey_verify=False,                            allow_agent=False,                            look_for_keys=False)   def test_notification(host, port, user, password):     # 1.Create a NETCONF session     with connect(host, port=port, user=user, password=password) as m:         # 2.Set the message-id for the rpc         msgId = 1002         rpc = CREATE_SUBSCRIPTION.format(msgId)          # 3.Send rpc         result = m._session.send(rpc)         m.take_notification(block=True, timeout=None)   if __name__ == '__main__':     logging.basicConfig(level=logging.DEBUG)     test_notification(sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4])