In Webinar 2, why did PX4 and Gazebo not automatically connect to QGroundControl?

[garrettgibo]

Problem

In Webinar 2, I failed to realize that I was starting Gazebo in a paused state (the current default behavior). When Gazebo starts in
a paused state, it doesn't actually send MAVLink message, so it doesn't connect to QGroundControl

Solution

You can configure Gazebo to start automatically by changing the paused parameter to false

roslaunch px4 mavros_posix_sitl.launch paused:=false