royale-ros provides a command line tool for listing all connected Royale
cameras and their serial numbers. The tool to list the connected cameras is
called lscam. Its usage now follows.
$ rosrun royale_ros lscam
[
"0005-1212-0034-2109",
"0005-4804-0050-1916"
]
We see in our example above, we have two connected cameras. We also note that
if a running instance of the camera_nodelet is managing a particular camera,
it will not show up in this list. So, to get a global list of all connected
cameras be sure that no instances of the camera_nodelet is running.