I have the below code for ROS2 Service Server and Service Client

Server:

import rclpy
from rclpy.node import Node
from rclpy.qos import QoSProfile
from example_interfaces.srv import AddTwoInts
import time

class AddTwoIntsServer(Node):

def __init__(self):
    super().__init__('add_two_ints_server')
    self.srv = self.create_service(AddTwoInts, 'add_two_ints', self.add_two_ints_callback,
    qos_profile=QoSProfile(depth=1, deadline=rclpy.duration.Duration(seconds=1)))

def add_two_ints_callback(self, request, response):
    response.sum = request.a + request.b
    self.get_logger().info('Incoming request: %d + %d' % (request.a, request.b))
    time.sleep(3)
    self.get_logger().info('Sending response: %d' % response.sum)
    return response

def main(args=None):
    rclpy.init(args=args)
    server = AddTwoIntsServer()
    rclpy.spin(server)
    rclpy.shutdown()

if __name__ == '__main__':
    main()

Client:

import rclpy
from rclpy.node import Node
from rclpy.qos import QoSProfile
from example_interfaces.srv import AddTwoInts


class AddTwoIntsClient(Node):

def __init__(self):
    super().__init__('add_two_ints_client')
    qos_profile.deadline.policy_kind = QoSDeadlineRequested.POLICY_KIND_DEADLINE
    self.cli = self.create_client(AddTwoInts, 'add_two_ints',
    qos_profile=QoSProfile(depth=1, deadline=rclpy.duration.Duration(seconds=1)))
    while not self.cli.wait_for_service(timeout_sec=1.0):
        self.get_logger().info('Service not available, waiting...')

def call_add_two_ints_service(self, a, b):
    request = AddTwoInts.Request()
    request.a = a
    request.b = b
    future = self.cli.call_async(request)
    rclpy.spin_until_future_complete(self, future)
    if future.result() is not None:
            response = future.result()
            self.get_logger().info('Result: %d' % response.sum)
    else:
            self.get_logger().error('Service call failed')

def main(args=None):
    rclpy.init(args=args)
    client = AddTwoIntsClient()
    client.call_add_two_ints_service(2, 3)
    rclpy.shutdown()

if __name__ == '__main__':
    main()

I would like to replicate the situation where a deadline is missed using the QoS policy, but I am not receiving any notifications indicating a missed deadline in this particular scenario. Instead, I'm able to receive the response.