Event handling on ROS2 Nodes across Launch files

General
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I am using ROS2, and writing Python Launch files.

Let’s say I have a launch file, L1 that starts node L1N1.

Then I have another launch file, L2, that can start node L2N1 on a specific condition.

The way I am running these Launch files is, that I am including the launch description of L1 into L2, this means that L2 starts running L2N1, and now I want to condition the execution of my node L2N2, on the basis of the state of L1N2.

Is there a way to register an event handler on the state of node L1N1, executed by the launch file L1,
that was included inside the same launch file L2?

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