# add_two_ints_client_async

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## Description

A ROS2 service client node that demonstrates asynchronous service calling pattern. It calls the `add_two_ints` service with two integers (2 and 3) and polls for the result using `spin_once` rather than blocking. This shows how to handle service responses asynchronously.

## Services

- **Service Client**: `/add_two_ints`
  - **Type**: `example_interfaces/srv/AddTwoInts`
  - **Description**: Asynchronously calls the add_two_ints service

## Example Usage

```bash
# Run the async client (requires add_two_ints_server to be running)
ros2 run demo_nodes_py add_two_ints_client_async
```

The client will output:
```
service not available, waiting again...  # (if server not ready)
[INFO] [add_two_ints_client]: Result of add_two_ints: 5
```

Complete example:
```bash
# Terminal 1: Run the server
ros2 run demo_nodes_py add_two_ints_server

# Terminal 2: Run the async client
ros2 run demo_nodes_py add_two_ints_client_async
```