If starting joy before xbox controller - no controller is detected

[drozzy]

If I start my ros2 joy node before I turn on the bluetooth xbox controller then joy doesn't detect it.

Steps to reproduce:

1. Start joy node: ros2 launch joy teleop_joy_node
2. Turn on xbox controller
3. Start ros2 topic echo joy
4. No output

However, this works just fine:

1. Turn on xbox controller
2. Start joy node: ros2 launch joy teleop_joy_node
3. Start ros2 topic echo joy
4. Output present.

Consequently, if the controller is ever turned-off during operation, we are back to the first problem - it's not detected upon starting.

I would love if there was some way to force joy node to somehow keep reconnecting to it.