Mavros launchfile

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I am trying to analyze the mavros package with an automated tool. For now, I need to have mavros run mission.py (located in mavros/mavros/src/mavros/mission.py) because that is where I believe problematic.

I start by launching mavros/mavros/launch/node.launch, whthout knowing anything about the purpose of that launchfile. I immediately got a message saying that the launchfile requires the 'fcu_url' arg to be set. Below are my questions?

1. How can I set fcu_url? What is FCU by the way?
2. Will node.launch run mission.py? If not, which launchfile will run mission.py?